Variable function programmed system

This invention relates to calculators and, more particularly, to a variable function fixed program calculator capable of being fabricated as a monolithic integrated semiconductor system utilizing contemporary semiconductor technology.

It is an object of the present invention to provide a system which functions as a basic desk top calculator. More particularly, it is an object of the invention to provide such calculator function including primitive decimal operations, such as add, subtract, multiply and divide with floating decimal point entry and either floating or fixed decimal point results on multi-digit operands. This object is accomplished in accordance with the present invention by providing, for example, a dynamic charge storage random access memory shifting array for registration of numeric and control data. The calculator includes a control memory such as a programmable logic array (PLA), a program memory such as a read only memory (ROM) and means for performing arithmetic and logic modification of registered data including binary coded decimal (BCD), bit-parallel digit-serial decimal arithmetic, and set-reset-toggle (SRT) FLAG data modification.

Another object of the invention is to provide a calculator system which is capable of being fabricated as a monolithic integrated semiconductor system. More particularly, it is an object of the invention to provide such calculator system which is capable of being fabricated as a monolithic integrated metal-insulator-semiconductor system utilizing contemporary metal-insulator-semiconductor technology. This object is accomplished in accordance with the present invention by providing a random access memory shift register system which requires approximately one-third the area of conventional shift register systems, providing internal generation of multiphase clocks from a single phase input clock which is included in the calculator but which is external to the monolithic structure and by providing a common programmed scanning system in the monolithic structure to provide both keyboard encoding and display decoding with minimum external connections between the monolithic system and the keyboard and display. The total number of connections from the monolithic structure to other calculator subsystems such as the keyboard, display and power supply are therefor minimized so that the monolithic structure is capable of being packaged in a conventional twenty-eight or forty pin package.

It is a further object of the present invention to provide a versatile calculator system in which the calculator function and input and output interfaces can be varied without changing the basic calculator structure, and particularly without changing the basic calculator structure as an integrated semiconductor system. This object is accomplished with the present invention by providing a programmable read only memory which provides a fixed program for the calculator system in accordance with the desired function of the calculator system and by providing programmable logic arrays for decoding and encoding the input, output and operating data by masking such data to any desired format. The programmable read only memory and the programmable logic arrays are easily modified by changing only the gate-insulator mask for the metal-insulator-semiconductor integrated system embodiment during the fabrication process.

Yet another object of the invention to provide a calculator with improved means for encoding keyboard commands and status information and which also functions as a direct interface means between a display decoder and a display for segmented and/or individual-decimal-numerical displays. This object is accomplished in accordance with the invention by providing a programmed scanning system to service both the keyboard input and display output, thereby minimizing hardware requirements for the key input system. Four keyboard input pins combine with eleven scanner output pins to allow a total of forty-four distinct keys and/or switches. The programmed routine residing in the read-only memory encodes the input form the keyboard array under program control. The scanning system operates at a slow enough rate to eliminate the need for any external keyboard drive circuitry and allows direct drive of large capacitance loads with response consistent to the scan rate. The scan program includes an encoding routine to effectively defeat transient noise and key bounce types of interference from the keyboard. An additional advantage of the keyboard scanning system then is that it requires few diodes, no amplifiers and simple switches which need not be low resistance or low bounce time switches. The display output includes internal segment or digit decoding, digit-blanking and zero suppression logic and utilizes the same scanning system as the keyboard. The display itself may be comprised of light-emitting diodes, liquid crystal, cold cathode gas discharge display elements, fluorescent display elements, multi-digit single-envelope cold-cathode gas-discharge tubes, incandescent display elements, etc. The multiple display capability is provided by the generally defined digit scanning and segment or numeral decoding system and by providing for an inter-digit blanking signal which is variable in terms of leading and trailing edge blanking intervals and in terms of its application to either the segment drivers or the digit drivers or both. The output decoder is comprised of a programmable logic array segment decoder circuit which can be programmed to accommodate any seven, eight, nine, ten segment or ten digit numerical display font plus a right or left decimal point. In this manner the calculator system of the present invention is essentially insensitive to the selection of a display which is utilized in conjunction with it.

It is still a further object of the invention to provide internal means for suppression of insignificant leading zeros in the calculator display. This object is accomplished by the programmed scanning system which provides scanning of the most significant output digits first and minimizes hardware means for detecting and suppressing leading zeros.

Another object of the invention is to allow both constant-operand and chained-intermediate-result type of calculations in a fully algebraic manner. This object is accomplished by providing an operator selectable control or mode switch to distinguish the constant-operand mode from the chained-intermediate-result mode of operation and by providing a fixed program decision routine in the read only memory array to detect the desired mode and effect it.

It is yet a further object of the invention to provide a calculator system which includes means for providing an automatic round-off solution for high accuracy in calculation. This object is accomplished in accordance with the present invention by utilizing a fixed program routine stored in the read only memory which adds the numeral five to the least significant digit which is to be lost. In this manner, a one is added to the second least significant digit which is to be kept when the least significant digit which is to be lost is greater than or equal to five.

Another object of the invention is to provide a calculator system with minimum power dissipation in order to provide a uniquely portable desk top calculator with good battery life. This object is accomplished in accordance with the present invention by provision of special control circuits to turn off dissipating functional elements except when such functional elements are actually being used and by provision of special pre-charge ratioless circuits within an metal-insulator-semiconductor embodiment of the read only memory, programmable logic array and arithmetic logic unit functional subsystems. For example, the instruction output from the read only memory need be detected only one per instruction cycle; a power control is applied to the read only memory decoder effecting a duty cycle of {fraction (2/13)}ths of the nominal static power dissipation to eliminate DC currents so that only transient CV

2

f power is disipated.

Still further objects and advantages of the invention will be apparent from the following detailed description and claims and from the accompanying drawings illustrative of the invention wherein:

FIGS. 1 and 2

are block diagrams illustrating the calculator system of the present invention;

FIG. 3

is a block diagram functionally describing data block

204

of one embodiment of the calculator system of the invention;

FIG. 4

is a block diagram of the FLAG registers illustrating the operation thereof;

FIG. 5

is a symbolic representation of the basic command word format and instruction map utilized in an embodiment of the calculator system;

FIG. 6

is a graph illustrating the basic instruction cycle timing for the calculator system;

FIG. 7

is a graph representing the scan cycle timing for the keyboard and display scan and relates the scan cycle to the instruction cycle timing period;

FIG. 8

is a representation of the data format for the A register, B register, C register, FA FLAG register, FB FLAG register and display;

FIG. 9

is a graph representing the keyboard program timing showing that the input-sensing program provides protection against transient noise, double-entry, leading-edge bounce and trailing-edge bounce;

FIGS. 10 and 11

are planar diagrams showing exemplary calculator keyboards utilized in conjunction with the present calculator system;

FIG. 12

is a circuit diagram of the display element showing the input and output connections to the digit scanning circuits;

FIG. 13

is a diagram showing a representative display font of a display utilized in conjunction with an embodiment of the present invention;

FIG. 14

is a graph showing how the segment drive includes the digit drive of an embodiment of the invention;

FIG. 15

is a circuit diagram of an interface circuit between the display elements and the scanning circuits in an embodiment of the present invention;

FIG. 16

is a circuit representation of a keyboard utilized in conjunction with the described calculator embodiment including the interconnections to the scanning circuits;

FIG. 17

is a logic and circuit diagram of metal-insulator-semiconductor embodiment of the calculator system of the invention which is further comprised of

FIGS. 17A-Z

;

FIGS. 18A-D

are diagrams showing the metal-insulator-semiconductor circuit equivalents of various logic gates shown in

FIG. 17

;

FIG. 19

is a circuit diagram illustrating the metal-insulator-semiconductor equivalent circuits of shift register cells

541

utilized in the commutator of the random access memory array shift register system utilized in the embodiment of

FIG. 17

;

FIG. 20

is a circuit diagram illustrating the metal-insulator-semiconductor driver circuit for the shift register cells of

FIG. 19

;

FIG. 21

is a diagram illustrating the circuit equivalents of the programmable logic arrays (PLA) utilized in the embodiment of

FIG. 17

;

FIGS. 22A-T

are flow charts showing the programs stored in the programmable read only memory of an embodiment of the calculator system to provide desk top calculator functions including floating decimal point operation, input routines and output routines; and

FIG. 23

is a planar view of the packaged monolithic structure showing terminal interconnects to the keyboard, display drivers and power supply.

FIG. 24

is TABLE VIII and shows problems with the +, − and = key configurations.

According to the present invention a variable function programmed calculator which includes a fixed program stored in a read only memory is capable of being fabricated as a monolithic integrated semiconductor system. In particular, the described embodiment is capable of being fabricated as a monolithic integrated metal-insulator-semiconductor system utilizing contemporary metal-insulator-semiconductor technology. The calculator system may be programmed to perform desk top calculator functions including floating decimal point operation or may be programmed to perform other useful operations. A monolithic structure of the calculator system includes a fixed program which is programmed in the programmable read only memory by modifying one of five or seven masks (the gate-insulator mask) during the fabrication process. In addition, the input, output and operating format of data within the calculator system is programmable in programmable logic arrays by altering the same masks. In the following sections the calculator system is first described in terms of the functional relationship between its various subsystems, then in terms of a specific circuits and finally in terms of the fixed programs stored in the read only memory.

Functional Description of the Calculator System

Referring to

FIGS. 1 and 2

, the calculator system of the present invention is illustrated in terms of the functional dependence among five internal functional subsystems of the calculator system and the relation between the internal functional subsystems and external functional elements. Program block

201

comprises a read only memory (ROM)

208

for storing fixed programs to operate the calculator in a desired manner and program counter (PC)

209

. Control block

202

comprises instruction register (IR)

190

for storing a control instruction, control decoders

191

for decoding control instructions and jump condition circuit

192

. Timing block

203

comprises a clock generator

143

, a timing generator

194

, digit and FLAG mask decoders

195

, and key input log

196

. Data block

204

comprises random access memory shift register system and FLAG data storage array

206

, decimal arithmetic unit

207

and FLAG logic unit

229

. Output block

205

comprises segment output decoder

198

and digit scanner outputs

197

.

Data Block

204

Referring to

FIG. 3

, a functional description of data block

204

is described in detail. Data block

204

includes means for providing decimal or hexadecimal data storage and means for providing basic operations. The storage structure of the present embodiment is parallel for decimal or hexadecimal digits; therefore, each interconnect

210

coupling the various functional elements symbolize four physical interconnections. A register

211

, B register

212

and C register

213

of memory array shift register system

206

comprise the primary decimal or hexadecimal storage means for the calculator logic unit 1-bit dynamic shift register delay circuits

214

are utilized to provide recirculating refresh of primary registers

211

,

212

and

213

. The outputs of A register

211

and C register

213

are input to the U selector

215

. The output of B register

212

and a constant N provided by means

223

are input to V selector

216

. A binary or binary coded decimal (BCD) adder

217

calculates the sum of difference between U and V, i.e., U+V or U−V. U is the plus side of the adder; V is the minus side of the adder. A Σ data selector

218

provides means for short and long path shifting operations. An output from adder

217

to an input of Σ data selector

218

corresponds to the normal path in which no shift is provided. The delayed adder input

225

to Σ data selector

218

corresponds to the long path in which a left shift is provided. The UV logical OR-gate

224

input to Σ data selector

218

corresponds to a short path which provides for a right shift. Data selector

219

selects the input to A register

211

as either the Σ output of Σ data selector

218

or the delayed B register

212

output or the delayed A register output. Data selector

200

selects the input to the B register as either the Σ output of Σ data selector

218

or the delayed A register

211

output or the delayed B register

212

output. Data selector

221

selects the input to the C register as either the Σ output of Σ data selector

218

or the delayed C register

213

output. Jump condition latch circuit

192

is loaded with the carry-borrow output of adder

217

.

A register

211

, B register

212

and C register

213

each provide dynamic recirculating storage for thirteen decimal or hexadecimal digits in the present embodiment. Adder

217

, U data selector

215

, V data selector

216

, Σ data selector

218

, A data selector

219

, B data selector

220

and C data selector

221

provide means for arithmetic and logical modification of the contents of registers

211

,

212

, and

213

by synchronous operation of selector and adder controls which is henceforth described in detail in the section describing control block

202

.

Referring to

FIG. 4

, the contents of data block

204

is illustrated with respect to 1-bit status or FLAG element storage and operation. The coupling of the functional elements is indicated by interconnects

230

. Two 12-bit register FA register

226

and FB register

227

provide means for storage of status or FLAG information. The outputs of FA register

226

and FB register

227

are delayed by 1-bit by means of dynamic shift register elements

228

before being input to FLAG operation logic unit

229

. The A and B outputs of FLAG operation logic unit

229

are coupled to FLAG registers

226

and

227

. Operations of FLAG operation logic unit

229

include recirculation, set, reset and toggle of individually addressed FLAGs; and, exchange and compare of FA and FB pairs of FLAGs. Controls SUB, FFLG, RFLG, SFLG, SLAG, and XFLAG are generated to perform the desired operation on a particular addressed FLAG or pair of FLAGs. The operation compare FLAG and the operation test FLAG result in an output from FLAG operation unit

229

to condition circuit

192

. The control mechanism for these FLAG operations are henceforth described in detail in the section describing control block

202

below.

Control Block

202

The functions of control

202

are to accept instruction words from program control block

201

, interpret the instruction word and a condition flip-flop as a command word for a subsequent instruction cycle and decode certain controls which operate data selectors and logic units in data block

204

, program block

201

and output block

205

.

The basic command word format and instruction map are illustrated in FIG.

5

. Referring to

FIG. 5

, I-bit

230

distinguishes jump from non-jump instructions. When I-bit

230

is a logical 0, then the instruction is a jump instruction and M-bit

231

distinguishes between true and false conditional jumps while the remaining bits of M field

232

, S field

233

, R field

234

and Σ field

235

contain the absolute address associated with the jump. When the instruction is a jump instruction (as indicated by a logical O being in the I-bit), but the jump condition is not satisfied, then ordinary incrementation of the program counter is effected. When the I-bit is a logical 1, then either a register or a FLAG operation is decoded; the entire M field

232

is used to distinguish register from FLAG operations as detailed in Table I below. When the binary code contained in M field

232

is between O and 9, a register operation is decoded; when the binary code contained in M field

232

is between 10 and 15, a FLAG operation is decoded.

In the case of register operations, the 10 codes M=O through M=9 are used to select on of 6 digit masks in combination with one of 3 constant values (N). The assignment of the 6 masks and 3 constants depends upon the desired data word format. The selections shown in Table I are utilized in the programming of a floating point decimal calculator function in accordance with the present invention.

In the case of FLAG operation, the 6 codes M=10 through M=15 are used to distinguish 6 FLAG codes, that is, compare, exchange, set, reset, toggle and test.

S-bit

233

of the command word controls three functional elements in data block

204

. S-bit

233

distinguishes add from subtract in binary or BCD adder

217

, distinguishes left shift from right shift in the Σ shift logic and distinguishes A from B in the FLAG operation logic. Add, shift and FLAG operations are exclusive operations and therefore require no further decoding. R field

234

distinguishes among arithmetic, exchange and keyboard input instructions as described in conjunction with TABLE II below. When the binary value contained in R field

234

is between 1 and 5, an arithmetic operation is indicated and U data selector gate

215

and V data selector gate

216

are controlled to enable the variables indicted in TABLE II as inputs to adder

217

. When the binary value contained in R field

234

is equal to 6, an exchange of A and B, without digit masking is enabled, bypassing adder

217

and the Σ gate

21

. When the binary value contained in R field

234

is 0 to 7, then an arithmetic no-op (no operation) is indicated, providing means for implementation of a special class of instructions for keyboard synchronization and encoding.

TABLE I

REGISTER

FLAG

M

MASK

N

OPERATION

0

ALL

1

EXPONENT

2

MANTISSA

3

LSD

1-LSD

4

MANTISSA

1-LSD

5

MANTISSA

1-MSD

6

EXPONENT

1-EXPONENT

7

DPT

1-DPT

8

DPT

8-DPT

9

EXPONENT

8-EXPONENT

A

COMPARE

B

EXCHANGE

C

SET

D

RESET

E

TOGGLE

F

TEST

Σ field

235

determines the selection of the output from Σ data selector

218

to A register

211

, B register

212

, C register

213

or none of these Σ data selector outputs. As shown in TABLE III, three codes are decoded to enable the output of Σ data selector

218

to be input to A register

211

, B register

212

and C register

213

; and the fourth code provides means for a no-op code to enable a class of keyboard synchronization and encoding instructions.

Condition circuit

192

reflects the status of the calculator at any given point in the execution of its fixed program. It is combined with the contents of Ma-bit

231

to determine if a jump instruction is to be executed or skipped. Condition circuit

192

is loaded with a carry-borrow (C/B) result of an arithmetic operation, the contents of any FLAG test or comparison (FA:FB) of any pair of FLAGs with a common (FMSK) address, the scanned conductance(closed equals 1) of key matrix cross-points of the keyboard switches in normal scanning sequence,or the value of a particular digit scanner state, for example, D

11

.

The carry-borrow and FLAG inputs to the condition circuit provide means for convenient branch operations whereby the sequential program execution can be made dependent on results of data, on arithmetic register operations, and on the current status of the calculator system as indicated by any of a plurality of status memories (FLAGs) as for example in the illustrated embodiment in which

26

FLAGs are available.

The key matrix and digit scanner inputs to the condition circuit provide means for convenient and efficient synchronization and encoding under program control of a plurality of keyboard inputs, as for example in the present illustrated embodiment, 44 inputs are available. TABLE IV shows the coding and operation of these instructions. The WAIT operations provide control means to recirculate program counter (PC)

209

at its current value (not incremented) until the WAIT condition (D

11

, KN, or KP) is satisfied. In addition, a register operation which subtracts the numeral 1 from the mantissa of A register

211

can be associated with the D

11

WAIT condition and is associated with the KN and KP WAIT condition instruction. The logical shift and FLAG initialization instructions are also shown in TABLE IV.

Timing Block

203

The function of the subsystem within timing block

203

is to generate three phase internal clocking (internal being within the monolithic structure of the preferred MOS embodiment) from an external single phase oscillator voltage, generate internal state and digital timing based upon the clocking inputs and provide digit and FLAG masking decoders. The basic instruction cycle timing for the calculator is illustrated in FIG.

6

. The φ system timing input

240

is a square wave provided by an oscillator with approximately 50% duty cycle. The 3 internal clock φ

1

, φ

2

and φ

3

provide signals

241

,

242

and

243

, respectively, which are derived from the φ system clock by means of a recirculating ring counter. With binary coded decimal parallel arithmetic utilized in accordance with the present invention, each digit of add or subtract calculation utilizes one full set of clock pulses φ

1

, φ

2

, and φ

3

. The full set of clock pulses is considered a state; consider for example the first state S

1

with a corresponding signal

244

. There are 13 such states S

1

-S

13

corresponding to the 13 digit circulation of registers

211

-

213

in data block

204

. The 13 states are generated by means of a feedback shift counter. Although the 13 states and 13 digit registers will allow storage of 13-digit numbers, a generalized floating point notation which is more convenient from the standpoint of program storage and manipulation of data is utilized in accordance with the present invention. This is accomplished by the masking or sub-addressing of registers

211

-

213

to mask or isolate 6 particular fields as follows: Mantissa field

245

which has N digits, the first of which is the least significant digit (LSD), the last of which is the overflow digit (OVF) and the (N−1)th digit of which is the most significant digit (MSD); masks are thus provided for the mantissa, the LSD, the MSD and the OVF. There is also provision for an exponent (EXP) mask and a display (DPT) mask. These 6 masks are generated in the digit mask decoder as commanded by the M mask field

232

of the instruction word. In accordance with the present invention, the masks are individually adjustable so that variable functioning systems can be accommodated within the calculator system. In the MOS embodiment, variations of the masks are effected by varying the gate oxide mask during the fabrication process to change the calculator operation. One variation for example, would be to set up one or more of the 6 masks to cover two digits and controlling the adder circuit in the data block to operate in hexadecimal as opposed to binary coded decimal thereby allowing for the processing of 8-bit binary characters by the calculator system.

TABLE IV

WAIT

REGISTER

JUMP

CLEAR

I

M

S

R

Σ

COND.

ARITHMETIC

COND.

FLAGS

1

0

0

7

0

D-11

1

0

0

0

0

D-11

A-1→A

M

1

0

1

0

0

KP

A-1→A

M

1

1

0

0

0

KN

A-1→A

M

1

1

1

0

0

KOvKN

1

1

0

0

0

KQ

1

0

0

1

1

SLL(A)

1

1

0

2

2

SLL(B)

1

2

0

3

3

SLL(C)

1

0

1

1

1

SRL(A)

1

1

1

2

2

SRL(B)

1

2

1

3

3

SRL(C)

1

13

0

3

1

FA

1

13

1

3

1

FB

In addition to the digit mask provisions, a subsystem of timing block

203

controls the addressing of FLAGS. The addressing of FLAGs is essentially a one out of thirteen selection and is accomplished by the FLAG maske decoder.

FIG. 7

illustrates the scan cycle timing for the keyboard and display scan and relates the scan cycle to the instruction cycle timing period. In accordance with the present embodiment of the invention both the keyboard inputs and display outputs are scanned with the same scan signals. In this manner, the number of pins required to package the system as s monolithic integrated semiconductor structure are reduced to a minimum and the internal system logic is simplified. It is desirable to scan at a rate which is slow enough to be consistent with conventional displays such as a neon tube display in addition to, for example, a liquid crystal display and simultaneously to calculate at a very high rate. Hence, the scanner of the present invention operates by nesting multiple instruction cycles within a scan cycle. In the illustrated embodiment there are 11 scan signals which are sufficient for a 10 digit numeric display plus a 1 digit control display such as an error (E) signal or minus (−) sign. This also allows very efficient coding of the keyboard entry routine. During each digit time, for example, D

11

with logic 1 signal

251

, 1 digit of a particular register is synchronously decoded. In order to retrieve the various digits of a particular register in sequence the output decode is double buffered. The input of the buffer is clocked on the state

252

which corresponds to the (equivalence: S

i

⊙D

i

). The output is clocked on a fixed state, for example, signal

253

of state S

13

, synchronous with the digit scan cycle. In this manner, during a digit scan cycle, each digit from the registers is recovered in sequence and synchronously displayed. The digit counter is itself clocked by a particular state, for example, state S

13

and operated by a feedback shift counter similar to the state feedback shift counter. In the present embodiment, the digit feedback shift counter counts down modulo

11

whereas the state counter counts up modulo

13

. In this manner the real-time most-significant-first scan which results provides means for implementation of zero suppression logic in the display.

The exemplified digit masks discussed with respect to

FIG. 6

are further clarified in FIG.

8

.

FIG. 8

illustrates the data format for A register

211

, B register

212

, C register

213

, FA FLAG storage element

226

, FB FLAG storage element

227

, and the display. A numeric example is shown in the register format

260

in order to clarify the operation of the digit masks. In the example, the decimal points (DPT) is shown equal to 2. Therefore, in display format

261

, the decimal appears at the D

3

location. The mantissa field is shown in the example for an 8 digit calculator system to exist between S

11

and S

3

.

Although there is no rigid requirement for the FLAG format

262

, in the present embodiment it is convenient to dedicate FA FLAG storage element

226

and FB FLAG storage element at S

11

mask or time-address to storage of the minus (−) and err (E) FLAGS for the display. In this manner the logic of segment decoder.

198

and hence of output block

205

is greatly simplified.

Finally, the subsystem of timing block

203

includes the key input logic. The function performed by this logic is buffering and synchronization to the internal instruction cycle. In accordance with the present calculator system no provision need be made in hardware to defeat transient noise, mechanical key bounce or double key entry; each of these functions are included as fixed program routines.

Program Block

201

As illustrated in

FIG. 2

, the subsystem of program block

201

is comprised of read only memory (ROM)

208

and program counter (PC)

209

. Read only memory

208

functions as a storage means for a linear program list which in the present embodiment contains 320 11-bit instruction words to provide the fixed programs which perform the particular calculator functions. Various embodiments of the calculator system are therefore provided by providing various combinations of programs in read only memory

208

. Read only memory

208

may be programmed in accordance with the techniques described in U.S. Pat. No. 3,541,343 to R. H. Crawford et al, titled Binary Decoder. The programs may include keyboard input routines, internal format routines, internal calculation routines and display format routines. Specific programs utilized in conjunction with the desk top calculator function of the calculator system of the invention and the programming of the calculator system to perform other functions are described in a later section.

Program counter

209

is, in the present embodiment, a 9-bit dynamic storage register which accepts a new input during each instruction cycle. The new input is either the program count itself, the program count incremented by 1 or 9-bits from the previous instruction word. These three inputs provide WAIT instructions, normal operating instructions and jump instructions, respectively.

One function of program block

201

is to provide a defeat mechanism by which malfunction of the keyboard encoding procedure is prevented. The input-sensing program provides protection against transient noise, double-entry, leading-edge bounce, and trailing-edge bounce, as shown in FIG.

9

. An ‘IDLE’ routine sequentially scans the [KO], [KN] and [KQ] inputs until a non-quiescent input is detected. The input is sampled again 2.5 ms later by a “TPOS” routine to distinguish a valid key-push from the transient noise. If the test is positive, then (5 ms after the initial detection) the program jumps to a ‘NBR’ or ‘OPN’ entry routine; otherwise, it returns to the ‘IDLE’ routine. The ‘NBR’ routine enters the number which is keyed-in into the display register; ‘OPN’ performs the keyed-in operation. Both routines terminate in a jump to a ‘TNEG’ routine. ‘TNEG’ performs a scan of the [KN], [KO] and [KQ] inputs to determine that the entire keyboard is in its quiescent condition. After a successful (negative) test the program jumps back to the ‘IDLE’ routine.

Five classes of keyboard inputs and consequent program routines are utilized in order to perform calculations and/or logic functions with the Calculator System, as follows: Number Keys, Mode Switches, A Decimal Point Switch, Operation Keys, and Interlock Keys. The distinctions between “keys” and “switches” is that keys are operated momentarily and exclusively, whereas switches are generally static and may have a normally-closed position. The program classes are explained by way of example; exemplary Calculator Keyboards using these keys are shown in

FIGS. 10 and 11

.

Number Keys: There are ten numeric keys and a decimal point key. Operation of the [O], [1], [2],[3], [4], [5], [6], [7], [8], and [9] keys left-shifts the display register one digit and enters the corresponding number into the least-significant digit. The [.] key is operated in normal sequence of figure entry. If it is not used, the point is assumed to be after the last numeric entered. The entry mode is always floating.

Mode Switches: The constant switch [K] selects between chain operation and constant operation. Normal operation of the calculator, with the constant [K] up (open) allows chained calculations without loss of intermediate result. Alternative operation with [K] down (closed) allows constant operand operation.

Point Switch: Floating or fixed mode of operations is selected by an 11-position switch [F]-[9]-[8]-[7]-[6]-[5]-[4]-[3]-[2]-[1]-[O]. Positions [O] through [9] are used for fixed-point calculations results; the [F] position selects full-floating operation.

Operation Keys: With 10 Number Keys, 2 Mode Switches, 11-position Point Switch, and 44 Matrix Crosspoints, there remains space for a total of 21 possible operation keys. These key locations are sufficient to include the two main keyboard configurations illustrated in

FIGS. 10 and 11

. [+] Stores an addition command and performs a possible preceding operation; [−] stores a subtraction command and performs a possible preceding operation; [×] stores a multiplication command and performs a possible preceding operation; [÷] stores a division command and performs a possible preceding operation; [+/−] changes the sign of the display register; [=] performs the preceding operation and stores a command to clear at the next number entered; [] enters the last keyed-in number in the calculator and performs a possible preceding operation; [] enters the last keyed-in number in the machine as a negative number; [C] clears all three registers and any preceding operation; [CI] clears the display register.

Interlock Key routines are functional hybrids of (momentary) operation keys and (static) mode switches. They provide a mechanism for interlocking the operation of the Calculator System to the operation of other device. In particular, the Calculator System may be programmed for at least three additional types of applications by the operation of Interlock Key routines, as follows: the Calculator System (master) controlling of a Slave Device (e.g., print mechanism or print control circuit); slave operation of the Calculator System by a Master Device (e.g., a remote controller through a real-time communication medium); and multiprocessing by a plurality of Calculator Systems of the present invention according to a preprogrammed interlock routine for determination of priority and effecting of intercommunication.

Output Block

205

In the described embodiment of the Calculator System, twenty-two outputs are provided to perform display and keyboard scanning, and synchronously decode the contents of the display register.

Referring to

FIG. 12

, the Digit Driver (D

1

, D

2

, D

3

, D

4

, D

5

, D

6

, D

7

, D

8

, D

9

, D

10

, D

11

) outputs of digit decoder

195

are used to scan-encode the keyboard and to scan the display. An inter-digit blanking signal is gate-mask programmed to disable the digit drivers for interface to particular display devices. The polarity of the digit signals is positive; that is, during Di, Di is conducting to VSS. This is provided in the described MOS calculator system embodiment in order to effectively scan the keyboard matrix.

The Segment Driver (SA, SB, SC, SD, SE, SF, SG, SH, SI, SJ, SP) outputs of the segment decoder

198

are gate-mask programmed for direct compatibility with 7- and 8-segment (plus decimal point) displays. In addition to segment code, both inter-digit blanking and segment polarity can be selected. Thus, the inter-digit blanking signal is programmable in increments of 12 microseconds (nominal); and it can be applied to either digit drivers or segment drivers, or both. The leading zeros (high-order zeros before the decimal point or a non-zero figure) are suppressed by disabling all segment drivers.

The described Calculator System embodiment digit and segment decoders have been programmed for a 7-bar digit-blanked characteristic with positive segment decoding (segment A “on” is decode as SA conducting to VSS). The display font is illustrated in FIG.

13

. The complete coding of the numerals, error (E) and minus (−) indications are shown. SH is not used for display but outputs information useful for testing purposes. SI and SJ are available in hardware for use with numeric displays with one terminal (e.g., cathode) per numeral. However, these output are not used for segmented displays in order to allow the monolithic integrated semiconductor embodiment of the Calculator System to be placed in a 28-pin packaging. When a clock period is 4 microseconds, for example, the scan rate is 156 microseconds per digit. For example, the present embodiment is programmed for 12-microsecond leading-edge blanking and 12-microsecond trailing-edge blanking on the digit drivers only. Hence, the segment drive covers the digit drive, as illustrated in FIG.

14

. An interface circuit which includes bi-polar transistors

15

for a common-cathode 7-bar LED display is shown in FIG.

15

. The interface circuit of the present embodiment is fabricated on a separate semiconductor substrate.

FIG.

16

. illustrates the key assignment of the described calculator embodiment. Each key, e.g.,

340

is a Form A normally open single pole, single throw switch, which has meaning for the particular input routine programmed in ROM

208

.

It is also contemplated that some of the “Mode Switches” discussed previously in the Program Block section could in some embodiments be in the form of jumper wires, thus more permanently selecting a particular mode for a particular model or family of equipment. In the way, a “master program” involving a single embodiment of the invention could economically and feasibly cover the whole family of distinct operational characteristics.

Logic and Circuit Description of the MOS Calculator System Embodiment

The calculator system according to the present invention has been discussed in terms of the function within each block of

FIGS. 1 and 2

. In the following sections the calculator system is described in terms of logic system and circuit elements which comprise the present calculator system embodiment which as previously noted is capable of being fabricated as a monolithic integrated semiconductor system utilizing contemporary MOS or MIS manufacturing technology. The complete calculator system of the present embodiment except for the keyboard illustrated separately in

FIG. 16

, the display element shown separately in

FIGS. 12-14

and the display driver illustrated separately in FIG.

15

. The logic/circuit diagram of

FIG. 17

is comprised of 26 figures,

FIGS. 17A through 17Z

which are put together as illustrated in FIG.

17

.

The functional elements described in the previous sections are identified in

FIG. 17

with like numerals. In program block

201

, program counter

209

provides a 9-bit address

501

to ROM

208

. The data output

501

from ROM

208

is then transmitted to instruction register

190

.

In control block

202

, outputs

503

of instruction register

190

are distributed to jump-condition circuit

192

; R decoder

191

A, control decoder

191

B, and Σ decoder

191

C of decoder

191

in control

202

; and, FLAG and digit mask decoder circuits

195

A and

195

B is mask decoder circuits

195

of timing block

203

. R decoder outputs

504

control U data selectors

215

and V data selectors

216

in data arithmetic logic unit

207

. The condition output

507

of jump condition circuit

192

controls jump gates

508

in program counter functional element

209

. Outputs

509

of Σ decode

218

control the A data selector gates

219

, the B data selector gates

220

and the C data selector gates

221

in arithmetic logic unit

207

. Outputs

513

of control decoder

191

B operate the condition selector gates

514

in jump condition circuit

192

. Outputs

515

of control decoder

191

B operate WAIT -KN- KP selector gate

516

of keyboard input circuit

196

. Outputs

517

of control decoder

191

B operate Σ gates

218

in arithmetic logic unit

207

.

In timing block

203

, outputs

518

of digit and FLAG mask decoders

195

drive FA and FB FLAG operation logic gates

519

and

520

. Outputs

521

of FLAG mask decoder

195

A operate keyboard synchronizing buffer control circuit

522

in keyboard input logic

196

. Output

523

of FLAG mask decoder

195

A provides a synchronizing time pulse to jump-condition circuit

192

. Outputs

524

of digit mask decoder

195

B is input to R decoder circuit

191

A and to FLAG mask decoder

195

B to discriminate FLAG commands from data operation commands. Output

526

from digit mask decoder

191

B provides a sub-addressing timing mask to Σ gate control circuit

527

and through the Σ decoder outputs

509

to A data selector gates

510

, B data selector gates

511

and C data selector gates

512

in arithmetic logic unit

207

; and, to carry-borrow detection gate

528

of jump-condition circuit

192

. Output

529

of digit mask decoder

191

B provides a right shift command to Σ control circuit

527

in arithmetic logic unit

207

. Output signals

536

of A register

211

of the FLAG and data storage array

206

are transmitted to AA buffer circuit

542

in segment decoder

198

.

In the following sections the logic and the circuit descriptions of blocks

201

-

205

is described in detail. In order to better understand the calculator system,the logic symbology and its MOS circuit equivalents is here discussed with reference to

FIGS. 18

A-D.

FIG. 17

is described in terms of conventional logic symbology using positive logic convention. However, additional notation has been included to clarify the particular MOS circuit embodiment which have been chosen to meet transient,voltage level and timing requirements of the system.

FIG. 18A

illustrates five different inverters which appear in FIG.

17

and their respective MOS circuit equivalents. Similarly,

FIG. 18B

illustrates five corresponding types of NAND gates and their respect to MOS circuit equivalents and

FIG. 18C

illustrates five corresponding types of NOR gates and their respect to MOS circuit equivalents. The five different types of MOS circuits shown in each of

FIGS. 18A-C

may be described as follows: a logic symbol

552

with no internal inscription is a conventional load ratio circuit. A logic symbol

553

with a single numeric inscription

1

,

2

or

3

indicates a dynamic implementation of the logic function with clocked load φI where I is the inscription. This type of circuit is used for lower power consumption and reduction of the number of service lines (DC voltages and clocks) required in arrays which don't require a gate bias voltage V

GG

. A logic symbol

554

with two numeric inscriptions IJ indicates implementation of the logic function using a special ratioless type circuit with precharges on φI and conditional discharge on φJ where I and J are members of the set {

1

,

2

,

3

} and the condition is the logical condition of conduction. This type of circuit is used to reduce power, to reduce cell size and/or to increase circuit speed. A logic symbol

555

with the inscription G infers performing of the logic function using a boot strap load circuit which is later described in detail. Finally, a logic symbol

556

with the inscription OD infers the implementation of that logic function using open-drain circuits. This type of circuit is used in wire-OR logic where only one of several coupled logic gates requires a load.

Logic and Circuit Description of Data Block

204

Data block

204

comprises random access memory array shift register system

206

which is further comprised of A register

211

, B register

212

, C register

213

, FA FLAG data storage register

226

and FB FLAG data storage register

227

; and decimal arithmetic logic unit

207

and FLAG logic unit

229

. Random access memory array shift register system

206

is comprised of a commutator system

545

which operates a 12×14 array or matrix

546

of charge storage cells

10

and

14

dynamic delays

214

. Array

546

of charge storage cells

10

and delay cells

214

provide the parallel shifting storage system for three thirteen digit numbers and twenty-six binary FLAGS. The commutator system

545

is comprised of twelve shift register cells

541

(illustrated in detail in

FIG. 19

) arranged in serial connection by coupling the output of each intermediate cell

541

to the input of the next cell

541

in the series. In this manner cells

541

are capable of distributing common read-write control signals sequentially to adjacent rows of storage array

546

. In order for the commutation to effect a stable image of rotation corresponding to the desired characteristics of fourteen parallel shifting shift registers of 13-bits in length with one input and one output for each of the fourteen columns of the array, additional means

547

and

544

are provided in the commutation circuit. NAND circuit

547

and delay element

544

eliminates multi-modal oscillations corresponding to circulation of more than one read-write control for rotation. The MOS circuit equivalents of shift register cells

541

is illustrated in FIG.

19

. Each shift register cell

541

is composed of a normal six MOS transistor shift register bit section and additionally includes a load circuit

548

which uses a capacitance boot strapping effect to given superior transient response as compared to conventional load circuits. RP pulse enable

550

from cell

543

and a kill circuit

551

which restricts the time interval of the read-write control pulse to that of clock φ

2

. The circuit of cell

543

is illustrated in detail in

FIG. 20

; circuit

543

develops the timing pulse RP by means of a double inverting amplifier circuit with an input from clock φ

2

. The random access memory shift register system embodied in the present invention is further described in copending patent application Ser. No. TI-4607 by Boone et al filed of even date with and assigned to the assignee of the present application. Patent application Ser. No. TI-4607 is incorporated by reference herein.

Again, referring to

FIG. 17

, A data selector gates

219

, B data selector gates

220

and C data selector gates

221

are coupled to and drive input means

510

,

511

and

512

of A register

211

(Columns A

1

, A

2

, A

4

and A

8

), B register

212

(Columns B

1

, B

2

, B

4

and B

8

) and C register

213

(Columns C

1

, C

2

, C

4

and C

8

), respectively. Output means

536

,

537

and

538

of A register

211

, B register

212

and C register

213

, respectively complete a recirculation path through 1-bit delay elements

214

back to normal inputs NA of data selector

219

, NB of data selector

220

and NC of data selector

221

. In addition to the normal paths, Σ gates

218

can be selected by the Σ A control of A data selector

219

or by the Σ B control of B data selector

220

or Σ C control of C data selector

221

. In addition to these paths, output means

536

and

537

of A register

211

and B register

212

, respectively, transmitted through delay cells

214

are capable of being enabled to B data selector gates

220

and A data selector gates

219

, respectively, by means of the exchange control in combination with the Σ A and Σ B controls as previously discussed with respect to FIG.

3

. All of the normal Σ and exchange controls are provided to data selectors

219

,

220

and

221

by Σ decoder

191

C.

Output means

536

of A register

211

and output means

538

of C register

213

, delayed by the first half of delay cell

214

, are selected (normally exclusively) to the plus side of adder

217

by U data selector

215

. Similarly, output means

537

of B register

212

, delayed by the first half of delay cell

214

and a constant N generated by means

524

are selected (normally exclusively) to the minus side of adder

217

by V data selector

216

. Exclusive OR circuits

554

are utilized to conditionally complement the V inputs to adder

217

with respect to their normal (add) polarity at nodes

55

and where the condition of such complementation is the subtract command from output

503

of instruction register

190

. U outputs

552

from U data selector

215

and the conditionally complemented V outputs

555

from exclusive OR circuits

554

are added with carry input

557

by ripple carry adder cells

556

to generate the binary sum U plus conditionally complemented V at nodes

558

and a binary carry signal at node

559

. The binary sum generated at

558

and carry generated at

559

are corrected by logic unit

563

to a decimal sum and carry at T adder nodes

560

and inter-digit carry node

561

depending upon the state of CK control

564

and CBRS control

565

. Controls

564

and

565

are used to select binary coding as opposed to binary-coded-decimal (BCD) operation and to block inter-digit carries in selected fields of the register data circulation.

Outputs

560

of T adder

563

can be selected by Σ data selectors

218

through either the no-shift (NS) or delay elements

566

and left shift (LS) Σ paths. Σ data selectors

218

also allow a right shift path by using the inverted U at input

552

and inverted V input

553

. Σ gate control circuit

527

transmits left or right shift commands to the left or right channels of Σ data selector

218

and enables the no-shift path when neither left shift or right shift commands are present. In addition, when a left shift command is present, Σ gate control circuit

527

generates a leading-edge detection of digit mask control

526

which are utilized by left shift delay elements

566

in order to block the first digit to insure insertion of a zero in the least significant digit masked.

The FLAG operation logic

229

, in much the same manner as the register operation logic of arithmetic logic unit

207

completes a circulation path generated by data storage array

206

. The output means of the FA storage cells

568

and the FB storage cells

569

are the normal recirculating inputs to FA operational logic

519

and FB operational logic

520

of FLAG logic unit

229

and also are transmitted to FLAG selection gates

570

in jump-condition circuit

192

. FLAG command inputs

518

from digit mask decoder

195

B allow a particular FLAG to be set, reset, or toggled where the particular FLAG is addressed by the SUB bit of instruction register

503

(FA and FB) and by FMSK control

519

from FLAG mask decoder

195

A (selecting one of thirteen time slots or states). In addition, FA and FB pairs of FLAGs in the same time slot (FMSK) may be exchanged by means of FFLG command

518

from digit mask decoder

195

B. FA and FB operation logic gates

519

and

520

provide FLAG data to FLAG data storage array input means

505

and

506

, respectively, to complete the circulation loop of the FLAGs.

Logic and Circuit Description of Control Block

202

Control block

202

is comprised of instruction register

190

, R decoder

191

A, control decoder

191

B, Σ decoder

191

C and jump-condition circuit

192

.

Instruction register

190

is comprised of a set of eleven inverters

575

whose inputs are sampled from the program block ROM

208

data outputs

502

once per instruction cycle by boot strapped NAND gate

571

. The R, control and Σ decoders

191

, as well as other decoders illustrated in

FIG. 17

are implemented in programmable logic arrays which are similar in structure to the read only memory (ROM) decoder/encoder circuits with the exception that the decoder is not fully generated. That is, whereas in a N-bit address ROM,

2

N

locations are decoded; in a PLA only the desired states are decoded. Consider, for example, the PLA illustrated in

FIG. 21. A

and B inputs

571

are presented to the first half (decoder) of a PLA in both true and complemented polarities. In this example, four product terms (decoder outputs)

572

are presented as inputs to a second (encoder) array. The circuits for the decoder gates

572

and encoder gates

573

are identical shunt gates; that is, logical NAND gates. However, since NAND-NAN logic reduces to AND-OR logic, it is convenient to use sum-of-product notation to describe the PLA circuit implementation where the dependence of a particular product term on a particular input is indicated by a circle at that juncture as for example

574

. The circles also correspond to the physical placement of MOS gates by a programmable gate maske utilized during the fabrication of the MOS embodiment.

In accordance with the above symbology for decoders (PLA), Σ decoder

191

C has a four-term decoder circuit

578

and a four-line output encoder section

579

in order to decode the controls

509

from the Σ A and Σ B inputs from output

503

of instruction register

190

and digit mask output

526

of digit mask decoder

195

B and EX exchange command

504

from R decoder

191

A. Similarly, R decoder

191

A converts R field

234

output

503

of instruction

190

into the UV command CU, AU, BV, and EX

504

and the R

7

WAIT condition code

580

using a seven-term decode array

581

and five-line output encoder array

582

. All terms of the R decode matrix

581

are also conditioned by the true state of the I-bit

230

of instruction register

190

at output

503

and by the FLAG signal

525

in the inverted state. Control decoder

191

B decodes the controls for special keyboard instructions for keyboard condition

513

, keyboard WAIT

515

and shift left and right

517

, Control decoder

191

B utilizes a twelve-term decoder

583

and a nine-line output encoder array

584

.

Jump-condition circuit

192

is comprised of a cross-coupled latch circuit

584

with inputs from the keyboard condition selector gates

514

, carry-borrow selector gate

528

and FLAG test and compare gates

570

to the SET side of the latch; a timing input

585

to the reset side of the latch; and a gating circuit

586

to enable jump-condition control

507

to jump gates

508

when a jump instruction is decoded and the jump-condition is true.

Logic and Circuit Description of Timing Block

203

Timing block

203

comprises a clock generator

193

, a state and digit timing generator

194

, digit and FLAG mask decoder arrays

195

and key input logic

196

.

All timing information for the calculator system is provided by a square wave generator or oscillator (external to the monolithic semiconductor system illustrated in

FIG. 17

) which is approximately 250 KHz. Input clock lead C as indicated by the φ terminal

530

in

FIG. 17X

provides means for applying the external clock signal to the monolithic calculator system. The basic clock shown in FIG.

17

X and the three phase clock shown in

FIG. 17Z

are both integrated into the monolithic semiconductor system. The square wave φ is immediately divided by the basic clock circuit of

FIG. 17X

into half frequency square waves φB

1

and φB

2

of opposite polarities at

531

and

532

, respectively. The two phase clock outputs φB

1

and φB

2

are in turn divided by means of 3-bit ring counter

588

to provide the three phase clock φ

1

L, φ

2

L and φ

3

L at

533

,

534

and

535

, respectively, as the basic clocking system for all of the logic and circuit elements of the calculator system embodiment of FIG.

17

.

State and digit timing generator

194

utilizes dynamic shift register elements and PLA logic to provide state counter

589

, digit counter

590

, state digit comparator

591

, state decoder

592

and digit decoder

593

. Re-encoded state decoder outputs

594

are distributed to the other functional elements to provide means for arbitrary selection of state timing on each of six independent timing buses. The state decoder outputs

595

are also distributed as required by other circuit elements of FIG.

17

. In addition to providing means for deriving the correct feedback for the digit feedback shift register, the outputs of digit decoder

593

drives the output scanner

197

.

Thirteen of the product terms in FLAG mask decoder

195

are used to correspond FLAG addresses from the R and Σ fields

234

and

235

, respectively of instruction register

190

at output

503

to states one through thirteen as decoded from the SA, SB, SC and SD inputs of state counter S to derive the FLAG addressing signal FMSK at

596

which is then gated to FLAG operation logic

519

and

520

as the timing address of FLAG operations. Similarly, digit mask decoder

195

B provides the digit mask signal

526

by associations of M field

232

of instruction register

190

at output

503

and from state counter

589

. In this manner set and reset associations of arbitrary correspondence between state and mask for each of the six distinct masks is provided. In addition to the digit mask, digit mask decoder

195

B also performs decoding of FLAG controls

518

, shift right control

529

and constant N generator

524

.

Logic and Circuit Description of Output Block

205

Segment output subsystem

198

is comprised of delay elements

542

which buffer output means

536

of the data storage array

206

, segment decoder (PLA)

601

and output buffer circuit

602

which drive terminals

576

with 11-decode segment output signals. The segment decoder array has ten product terms for means of decoding numeric information for selective recombination, that is, encoding on numeric segment outputs

602

; product terms for decoding FLAG information (for example, error or minus sign); and, product terms and feedback signal

603

to implement zero suppression.

The scan output subsystem

197

is comprised of 11 2-input NAND gates

604

which block digit decoder outputs

593

by digit BLANK signal

606

for inter-digit blanking capability; and, output buffer circuits

605

to drive terminals

576

effecting a scan of the keyboard and display as previously described.

Logic, Circuit and Program Description of Program Block

201

As previously described, program block

201

is comprised of program counter (PC)

209

and read-only memory (ROM)

208

. Together, program counter

209

and read-only memory

208

perform the address-modification required for each instruction, and provide the control block

202

with, for example, in the described embodiment an 11-bit input to the instruction register (IR)

190

.

The address modification required by a current instruction is either no modification for WAIT operations, binary add one for normal incremented operations and jump operations that are not executed, or replacement of the entire 9-bit program counter with nine bits from instruction register

190

for jump operations which are executed. The no modification for WAIT operations and binary add one for normal incremented operations and jump operations which are not executed are satisfied by means of a serial input

651

to the MSD of program counter

209

from key input logic

196

in timing block

203

which either recirculates the LSD output

652

of program counter

209

or adds one to the LSD and circulates it to the MSB of the program counter

209

, respectively. In either case the circulation is synchronous to the instruction cycle. The replacement of the entire 9-bit count with nine bits from instruction register

190

for jump operations which are executed is satisfied by means of parallel strobing of output

503

of instruction register

190

by the output of condition circuit

192

into the inputs

653

of all bits of program counter

209

simultaneously during state

512

of the instruction cycle.

The output of the instruction word to the control block instruction register

190

is strobed by NAND gate

654

providing a new input to instruction register

190

every instruction cycle during state S

13

. The serial circulation of program counter

190

is provided by means of conventional shift register bits

656

clocked by NAND gates

655

during S

3

through S

12

. The TOM is comprised of a 1-out-of-64 decoder per instruction register

190

bit output

503

driving an array of 5 NAND gates per bit or a total of 55 NAND gates. One of these five gates is addressed by a 1-out-of-5 encoder for each bit. Hence, means is provided for storage of a maximum of 320 11-bit words, and a selection (decode and encode) is provided for random addressing of any one word. Program block

201

in the present calculator embodiment is comprised of programmable read-only memory

208

to store a fixed program; in further embodiments, however, a read-write memory replacing memory

208

would provide means for continuously varying the stored program and hence change the operation of the calculator system.

The resident program in one embodiment of the variable function calculator system provides means for the calculator operation characteristics called “Combination B” shown in Table VIII. The corresponding flowcharts for this embodiment are illustrated in

FIGS. 22A

to T; the resulting linear program is shown in Table VI; and the hexadecimal ROM code is shown in Table V. Finally a logic simulation result for a portion of an executing problem example is shown in Table VII.

Referring to

FIG. 22

, the calculator program logic flow is as follows:

TABLE V

1802 ROM ASSEMBLY

COMBINATION B (+−=)

ROM CODE

START

END

OBJECT CODE IS 11 BITS

000

010

TM1802

F8B2

F892

FBFE

FBFC

FBFF

F89D

FBFF

FB9F

0404

FBFF

FB9F

FBFF

0609

FBFF

FBFF

FB9F

0609

011

021

TM1802

F816

0404

FBE3

0458

043E

0441

045B

0404

0441

0440

0446

0447

0441

F8FC

F81B

062A

FBFE

022

032

TM1802

F89B

F895

F894

F83D

062A

F83E

042A

F855

F83C

042F

FA3E

FA1A

0604

F8BC

FA9B

0634

F9DB

033

043

TM1802

0436

F8D7

0604

F81C

0639

FA3A

FB7A

FBFF

FB1E

FB3A

0404

F8DC

061F

F8DD

F89E

F83E

064A

044

054

TM1802

F8FF

067E

F8DD

F8DE

F83E

064E

F81B

0644

F81E

0453

FBF8

F8B5

F815

0653

F8F5

F93E

F93D

055

065

TM1802

F89C

F8DB

0604

F89C

F897

0621

F855

0604

F974

066C

FB8F

0663

FBE7

F935

FB8C

F834

0668

066

076

TM1802

FBE7

F935

FA50

0475

FB55

0668

F834

0471

FBE7

F935

F934

FADB

046E

FBAC

0668

FB4F

0679

077

087

TM1802

FBE7

F935

F975

047D

FB4E

067E

FB6E

FADB

04A4

FABD

FB75

FB4F

0488

FB5A

F814

0493

FA7A

088

098

TM1802

F9DB

0495

FA9B

06A5

FB7A

F814

049A

FA5B

049F

FA5A

0688

FA5A

0688

FA3A

FA9B

04A2

F814

099

0A9

TM1802

048F

F99B

04A0

F8D6

F99A

06A0

F854

FA7A

0688

FB7A

0688

FBFE

F83F

0705

FBE7

FBF2

FBF4

0AA

0BA

TM1802

F934

F837

F877

067E

F8BF

F83E

065D

F83D

06B7

F838

04B7

FBE7

F934

F8B8

FBFF

FB7F

06BC

0BB

0CB

TM1802

F8F8

F975

F895

04C0

F8D5

F974

06C6

F83D

04CB

FBAE

06D4

F83D

04C4

FB8F

06CB

F854

FB8E

0CC

0DC

TM1802

06D4

FBAE

FBE7

FB8D

FBE7

F83D

06D4

F854

FADB

04FB

FB78

FB7E

F83D

06F7

FB4B

04E2

FB48

0DD

0ED

TM1802

FAFA

06DA

FADA

F8D6

0604

FA9B

06FB

FADB

06EE

F814

04EB

FA5B

06ED

F8D4

FA7A

06EE

FA5A

0EE

0FE

TM1802

FB7A

FAD3

04E2

FB70

06DA

FB50

FAD3

04FB

FB5A

FB10

04F3

FB6E

06F7

FBF4

F81E

06FF

F8B8

0FF

10F

TM1802

F838

047E

F8BE

F8BD

067E

FB5A

FA5B

0511

FA5A

F814

0504

F99B

050F

F99A

F8D6

0705

FA1A

110

120

TM1802

0705

F894

F816

0523

FB1B

071B

FA1B

051B

FB5A

FA1A

0714

B81E

0523

FBE7

FBFE

FBFF

FBDF

121

131

TM1802

0526

FBE7

F838

0455

064E

FBFF

FB3E

0729

FB3A

FBDA

FBF5

FB55

FB8F

FBE7

0739

FA5A

FB5A

132

142

TM1802

FBE7

FB8F

FBE7

0530

FB7A

FBDA

0723

FB8F

0736

FA9B

0736

FB7A

FA7A

0739

0000

0000

0000

143

153

TM1802

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

154

164

TM1802

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

165

175

TM1802

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

176

186

TM1802

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

187

197

TM1802

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

198

1A8

TM1802

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

1A9

1B9

TM1802

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

1BA

1CA

TM1802

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

1CB

1DB

TM1802

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

1DC

1EC

TM1802

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

1ED

1FD

TM1802

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

1FE

1FF

TM1802

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

0000

TABLE VI

000

111

0100

1101

CLR

ZAFL

001

111

0110

1101

ZBFL

002

100

0000

0001

CLA

ALL

003

100

0000

0011

CLC

ALL

004

100

0000

0000

LOCK

WD11

005

111

0110

0010

ZFB

2

MAKING SURE THAT PREV OP FLAG 2 IS 0

006

100

0000

0000

WD11

007

100

0110

0000

SCAN

008

010

0000

0100

BZ

LOCK

KEY IS NOT RELEASED YET

009

100

0000

0000

IDLE

WD11

00A

100

0110

0000

SCAN

00B

100

0000

0000

WD11

00C

000

0000

1001

BO

IDLE

NOT FOUND ANYTHING

00D

100

0000

0000

WD11

00E

100

0000

0000

WD11

00F

100

0110

0000

SCAN

010

000

0000

1001

BO

IDLE

NOT FOUND ANYTHING

*-----INPUT ROUTINE-----------

011

111

1110

1001

TFB

9

OVERFLOW FLAG

012

010

0000

0100

BZ

LOCK

YOU MUST DO A CLEAR

013

100

0001

1100

SPWD

014

010

0000

0000

BZ

CE

CLEAR ENTRY

015

010

0000

0000

BZ

DPT

016

010

0000

0000

BZ

PLEQ

= KEY

017

010

0000

0000

BZ

S

CHANGING SIGN

018

010

0000

0100

BZ

LOCK

−= KEY

019

010

0000

0000

BZ

PLEQ

01A

010

0000

0000

BZ

MIN

− KEY

01B

010

0000

0000

BZ

DIVI

01C

010

0000

0000

BZ

MULT

01D

010

0000

0000

BZ

PLEQ

+ KEY

*----- DATA ENTRY PRIME----------

01E

111

0000

0011

SFA

3

FLAG MISC DATA ENTRY PRIME

01F

111

1110

0100

D3

TFB

4

FLAG DISPLAY

020

000

0000

0000

BO

D1

021

100

0000

0001

D2

CLA

ALL

022

111

0110

0100

ZFB

4

FLAG DISPLAY

023

111

0110

1010

ZFB

10

FLAG SIGN OF MONT OF A

024

111

0110

1011

ZFB

11

FLAG SIGN OF EXP OF A

025

111

1100

0010

TFA

2

026

000

0000

0000

BO

D1

027

111

1100

0001

TFA

1

028

010

0000

0000

BZ

D1

029

111

1010

1010

FFB

10

A NEGATIVE NUMBER

02A

111

1100

0011

D1

TFA

3

FLAG MISC

02B

010

0000

0000

BZ

D7

02C

101

1100

0001

DPTA

02D

101

1110

0101

SAKA

DPT1

PUT A 0 TO DPT OF A; ONLY LAST DPT EFFECTIVE

02E

000

0000

0100

BO

LOCK

ALWAYS BRANCH

*-----DIGIT ENTRY----------

02F

111

0100

0011

D7

ZFA

3

MISC

030

101

0110

0100

CAK

MSD1

031

000

0000

0000

BO

D5

DIGIT OVERFLOW

032

110

0010

0100

CAK

DPT7

033

010

0000

0000

BZ

D6

034

111

0010

1000

D5

SFB

8

035

000

0000

0100

BO

LOCK

DIGIT OVERFLOW

036

111

1110

0011

D6

TFB

3

DPT FLAG

037

000

0000

0000

BO

D4

038

101

1100

0101

AAKA

DPT1

039

100

1000

0101

D4

SLLA

MONT

LSD OF A IS MADE TO 0

03A

100

0000

0000

WD11

03B

100

1110

0001

SOCN

03C

100

1100

0101

AAKA

LSD1

03D

010

0000

0100

BZ

LOCK

ALWAYS BRANCH

*-----DPT ENTRY---------

03E

111

0010

0011

DPT

SFB

3

DPT FLAG

03F

000

0001

1111

BO

D3

ALWAYS BRANCH

*-------------------------

040

111

0010

0010

MIN

SFB

2

SUBTRACT COMMAND

041

111

0110

0001

PLEQ

ZFB

1

CURR OP 1

042

111

1100

0001

TFA

1

PREV OP 1

043

000

0000

0000

BO

OP2

044

111

0000

0000

OP5

SFA

0

P-FLAG

045

000

0000

0000

BO

PRE

ALWAYS BRANCH

046

111

0010

0010

DIVI

SFB

2

047

111

0010

0001

MULT

SFB

1

048

111

1100

0001

TFA

1

PREV OP 1

049

000

0000

0000

BO

OP6

04A

111

1110

0100

OP2

TFB

4

DISPLAY FLAG

04B

000

0100

0100

BO

OP5

04C

111

1110

0001

TFB

1

CURR OP FLAG 1

04D

010

0000

0000

BZ

OP1

ONLY LAST *,/ OPERATOR IS EFFECTIVE

04E

100

0000

0111

OP6

AAKC

ALL

04F

111

0100

1010

ZFA

10

SIGN OF MONT OF C

050

111

1110

1010

TFB

10

SIGN OF MONT OF A

051

000

0000

0000

BO

OP1

052

111

0000

1010

SFA

10

053

110

1100

0001

OP1

XFA

1

EXCHANGE CURRENT 1 WITH PREV 1

054

110

1100

0010

XFA

2

EXCHANGE CURRENT 2 WITH PREV 2

055

111

0110

0011

OP3

ZFB

3

DPT FLAG

056

111

0010

0100

SFB

4

FLAG DISPLAY

057

000

0000

0100

BO

LOCK

ALWAYS BRANCH

*-----CLEAR ENTRY---------

058

111

0110

0011

CE

ZFB

3

FLAG DPT

059

111

0110

1000

ZFB

8

05A

000

0010

0001

BO

D2

ALWAYS BRANCH

*----- CHANGE SIGN-------

05B

111

1010

1010

S

FFB

10

05C

000

0000

0100

BO

LOCK

ALWAYS BRANCH

*-----ADD AND SUBTRACT---------------

05D

110

1000

1011

A/S

CFA

11

COMPARING EXP SIGNS

05E

000

0000

0000

BO

AS2

05F

100

0111

0000

CAB

EXP

060

000

0000

0000

BO

AS3

061

100

0001

1000

EXAB

ALL

062

110

1100

1010

XFA

10

063

100

0111

0011

AS3

SABC

EXP

064

111

1100

1011

TFA

11

SIGN OF EXP

065

000

0000

0000

BO

AS4

066

100

0001

1000

EXAB

ALL

067

110

1100

1010

XFA

10

068

101

1010

1111

AS4

SCKC

EXP1

069

010

0000

0000

B7

AS5

06A

100

1010

1010

SRLB

MONT

06B

000

0110

1000

BO

AS4

ALWAYS BRANCH

06C

111

1100

1011

AS2

TFA

11

06D

010

0000

0000

BZ

AS6

06E

100

0001

1000

AS7

EXAB

ALL

06F

110

1100

1010

XFA

10

070

110

1100

1011

XFA

11

071

101

0010

0100

AS6

CAK

M11

072

010

0110

1110

BZ

AS7

073

100

0101

0011

AABC

EXP

074

000

0110

1000

BO

AS4

ALWAYS BRANCH

075

100

1011

0000

AS5

CAB

MONT

076

000

0000

0000

BO

AS9

077

100

0001

1000

EXAB

ALL

078

110

1100

1010

XFA

10

079

110

1000

1010

AS9

CFA

10

07A

010

0000

0000

BZ

AS8

07B

100

1011

0001

SABA

MONT

07C

000

0000

0000

BO

PRE

ALWAYS BRANCH

07D

100

1001

0001

AS8

AABA

MONT

*-----PRENORMALIZING A NUMBER----------

07E

101

0010

0100

PRE

CAK

M11

07F

010

0000

0000

BZ

A91

DATA IS ZERO

080

101

0100

0010

MSDB

081

100

1000

1010

SLLB

MONT

082

100

1011

0000

CAB

M19

IS M9 OF A NON-ZERO ?

083

010

0000

0000

BZ

A2

MSD OF A ZERO

084

100

1010

0101

SRLA

MONT

085

111

1110

1011

TFB

11

SIGN OF EXP

086

010

0000

0000

BZ

A13

087

101

1000

0101

AAKA

EXP1

088

110

0010

0100

A2

CAK

DPT7

089

010

0000

0000

BZ

A3

DPT OF A LESS THAN 7

08A

101

0110

0100

CAK

M81

08B

000

0000

0000

BO

A9

08C

100

1000

0101

SLLA

MONT

08D

111

1110

1011

TFB

11

SIGN OF EXP

08E

010

0000

0000

BZ

A4

EXP OF A IS −

08F

101

1010

0100

A5

CAK

EXP1

090

010

0000

0000

BZ

A6

EXP OF A IS ZERO

091

101

1010

0101

SAKA

EXP1

092

000

1000

1000

BO

A2

ALWAYS BRANCH

093

101

1010

0101

A13

SAKA

EXP1

094

000

1000

1000

BO

A2

ALWAYS BRANCH

095

101

1100

0101

A3

AAKA

DPT1

096

101

0110

0100

CAK

M81

097

010

0000

0000

BZ

A8

M8 OF A IS ZERO

098

111

1110

1011

TFB

11

SIGN OF EXP

099

010

1000

1111

BZ

A5

SIGN OF E OF A IS NEGATIVE

09A

110

0110

0100

A4

CAK

EXP7

09B

010

0000

0000

BZ

A7

EXP OF A LESS THAN 7

09C

111

0010

1001

SFB

9

OVERFLOW

09D

110

0110

0101

SAKA

EXP7

09E

000

0000

0000

BO

A7

ALWAYS BRANCH

09F

111

1010

1011

A6

FFB

11

CHANGE SIGN OF EXP OF A

0A0

101

1000

0101

A7

AAKA

EXP1

0A1

000

1000

1000

BO

A2

ALWAYS BRANCH

0A2

100

1000

0101

A8

SLLA

MONT

0A3

000

1000

1000

BO

A2

ALWAYS BRANCH

0A4

100

0000

0001

A91

CLA

ALL

0A5

111

1100

0000

A9

TFA

0

P-FLAG

0A6

000

0000

0000

BO

POST

0A7

100

0001

1000

EXAB

ALL

0A8

100

0000

1101

ACKA

ALL

0A9

100

0000

1011

ABKC

ALL

0AA

110

1100

1011

XFA

11

0AB

111

1100

1000

TFA

8

A SPECIAL FLAG OFR PRE ROUTINE

0AC

111

1000

1000

FFA

8

0AD

000

0111

1110

BO

PRE

0AE

111

0100

0000

ZFA

0

P-FLAG

0AF

111

1100

0001

TFA

1

0B0

000

0101

1101

BO

A/S

*-----MULTIPLY AND DIVIDE--------

0B1

111

1100

0010

M/D

TFA

2

PREV OP 2

0B2

000

0000

0000

BO

M1

0B3

111

1100

0111

TFA

7

C-REG CONTAINING A CONSTANT ?

0B4

010

0000

0000

BZ

M1

0B5

100

0001

1000

EXAB

ALL

0B6

110

1100

1011

XFA

11

0B7

111

0100

0111

M1

ZFA

7

RESET THE CONSTANT FLAG IN CASE K IS RELEASED

0B8

100

0000

0000

WD11

0B9

100

1000

0000

KQCD

0BA

000

0000

0000

BO

M22

0BB

111

0000

0111

SFA

7

C-REG CONTAINS A CONSTANT

0BC

110

1000

1010

M22

CFA

10

0BD

111

0110

1010

ZFB

10

0BE

010

0000

0000

BZ

M2

0BF

111

0010

1010

SFB

10

0C0

110

1000

1011

M2

CFA

11

0C1

000

0000

0000

BO

M20

UNLIKE E SIGNS

0C2

111

1100

0010

TFA

2

* OR /

0C3

010

0000

0000

BZ

M3

/

0C4

100

0101

0001

M21

AABA

EXP

0C5

000

0000

0000

BO

M4

ALWAYS BRANCH

0C6

111

1100

0010

M20

TFA

2

* OR /

0C7

010

1100

0100

BZ

M21

/

0C8

100

0111

0000

CAB

EXP

0C9

000

0000

0000

BO

M3

0CA

111

1010

1011

FFB

11

0CB

100

0111

0001

M3

SABA

EXP

0CC

000

0000

0000

BO

M4

0CD

100

0101

0001

AABA

EXP

0CE

100

0001

1000

FXAB

ALL

0CF

100

0111

0010

SABB

EXP

0D0

100

0001

1000

EXAB

ALL

0D1

111

1100

0010

TFA

2

* OR /

0D2

000

0000

0000

BO

M4

*

0D3

111

1010

1011

FFB

11

0D4

101

0010

0100

M4

CAK

M11

0D5

010

0000

0000

BZ

M8

TAKE CARE OF 0/A, 0/0, A*0 THE RESULT IS 0

0D6

100

1000

0111

AAKC

MONT

0D7

100

1000

0001

CLA

MONT

0D8

111

1100

0010

TFA

2

PREV OP 2

0D9

000

0000

0000

BO

M5

MULTIPLY

0DA

100

1011

0100

M6

CCB

MONT

0DB

010

0000

0000

BZ

M7

0DC

100

1011

0111

SCBC

MONT

0DD

101

0000

0101

AAKA

M11

0DE

000

1101

1010

BO

M6

0DF

101

0010

0101

SAKA

M11

OVFLOW

0E0

111

0010

1001

SFB

9

0E1

000

0000

0100

BO

LOCK

ALWAYS BRANCH

0E2

101

0110

0100

M7

CAK

MSD1

0E3

000

0000

0000

BO

M8

DIVISION DONE, WITH OR WITHOUT REMAINDER

0E4

101

0010

0100

CAK

M11

0E5

000

0000

0000

BO

M23

0E6

111

1110

1011

TFB

11

SIGN OF EXP OF A

0E7

010

0000

0000

BZ

M24

0E8

101

1010

0100

CAK

EXP1

0E9

000

0000

0000

BO

M25

0EA

111

0010

1011

SFB

11

0EB

101

1000

0101

M24

AAKA

EXP1

0EC

000

0000

0000

BO

M23

ALWAYS BRANCH

0ED

101

1010

0101

M25

SAKA

EXP1

0EE

100

1000

0101

M23

SLLA

MONT

0EF

101

0010

1100

CCK

M11

0F0

010

1110

0010

BZ

M7

0F1

100

1000

1111

SLLC

MONT

0F2

000

1101

1010

BO

M6

ALWAYS BRANCH

0F3

100

1010

1111

M9

SRLC

MONT

0F4

101

0010

1100

CCK

M11

0F5

010

0000

0000

BZ

M8

0F6

100

1010

0101

SRLA

MONT

0F7

100

1110

1111

M5

SCKC

LSD1

0F8

010

1111

0011

BZ

M9

0F9

100

1001

0001

AABA

MONT

0FA

000

1111

0111

BO

M5

ALWAYS BRANCH

0FB

100

0000

1011

M8

ABKC

ALL

0FC

111

1110

0001

TFB

1

CURR OP 1

0FD

000

0000

0000

BO

M12

0FE

111

0100

0111

ZFA

7

0FF

111

1100

0111

M12

TFA

7

CONSTANT IN C-REG ?

100

010

0111

1110

BZ

PRE

101

111

0100

0001

ZFA

1

PREV OP 1

102

111

0100

0010

ZFA

2

RESET PREV OP 2

103

000

0111

1110

BO

PRE

ALWAYS BRANCH

*-----POST NORMALIZATION ROUTINE---------

104

100

1010

0101

P2

SRLA

MONT

105

101

1010

0100

POST

CAK

EXP1

106

010

0000

0000

BZ

P1

107

101

1010

0101

SAKA

EXP1

108

111

1110

1011

TFB

11

SIGN OF EXP OF A

109

011

0000

0100

BZ

P2

10A

110

0110

0100

CAK

EXP7

10B

010

0000

0000

BZ

P7

10C

110

0110

0101

SAKA

EXP7

10D

111

0010

1001

SFB

9

OVERFLOW

10E

001

0000

0101

BO

POST

ALWAYS BRANCH

10F

101

1110

0101

P7

SAKA

DPT1

110

001

0000

0101

BO

POST

ALWAYS BRANCH

111

111

0110

1011

P1

ZFB

11

112

111

1110

1001

TFB

9

OVERFLOW

113

010

0000

0000

BZ

OP4

NOT SET DESIRED DPT OR LOSE TRAILING 0 IF OVFLOW

114

100

1110

0100

P5

CAK

LSD1

115

000

0000

0000

BO

P4

116

101

1110

0100

CAK

DPT1

117

010

0000

0000

BZ

P4

118

100

1010

0101

SRLA

MONT

GETTING RID OF TRAILING ZEROS

119

101

1110

0101

SAKA

DPT1

11A

001

0001

0100

BO

P5

ALWAYS BRANCH

11B

111

1110

0001

P4

TFB

1

CURR OP 1

11C

010

0000

0000

BZ

OP4

INTERMEDIATE RESULT IN FLOATING MODE

11D

100

0001

1000

EXAB

ALL

11E

100

0000

0001

CLA

ALL

11F

100

0000

0000

WD11

120

100

0010

0000

KPCD

121

010

0000

0000

BZ

P3

FIXED POINT MODE

122

100

0001

1000

EXAB

ALL

FLOATING MODE

123

111

1100

0111

OP4

TFA

7

CONSTANT IN C-REG ?

124

010

0101

0101

BZ

OP3

125

000

0100

1110

BO

OP6

ALWAYS BRANCH

126

100

0000

0000

P3

WD11

127

100

1100

0001

SOCP

128

000

0000

0000

BO

NEXT

129

100

1100

0101

NEXT

AAKA

LSD1

RESET COND CODE

12A

100

0010

0101

SRLA

ALL

DESIRED DECIMAL PLACE GOES TO EXP OF A

12B

100

0000

1010

SLLB

ALL

ACTUAL DECIMAL PLACE GOES TO EXP OF B

12C

100

1010

1010

SRLB

MONT

12D

100

0111

0000

CAB

EXP

12E

100

0001

1000

EXAB

ALL

12F

000

0000

0000

BO

P6

130

101

1010

0101

P8

SAKA

EXP1

131

100

1010

0101

SRLA

MONT

132

100

0001

1000

EXAB

ALL

133

100

0111

0000

CAB

EXP

134

100

0001

1000

EXAB

ALL

135

011

0011

0000

BZ

P8

136

100

1000

0101

P9

SLLA

MONT

137

100

0010

0101

SRLA

ALL

138

001

0010

0011

BO

OP4

ALWAYS BRANCH

139

100

0111

0000

P6

CAB

EXP

13A

001

0011

0110

BO

P9

DESIRED DPT = ACUTAL DPT

13B

101

0110

0100

CAK

MSD1

A8 NON-ZERO ?

13C

001

0011

0110

BO

P9

CAN NOT ADJUST TO EQUAL DPT

13D

100

1000

0101

SLLA

MONT

13E

101

1000

0101

AAKA

EXP1

13F

001

0011

1001

BO

P6

ALWAYS BRANCH

TABLE VII

EXAMPLE INSTRUCTION TRACE . . . DATA CARD 157 ($7.79 −= $) . . .

PC

I-REG

A-REG

B-REG

C-REG

FLAGS (A)

FLAGS (B)

C

KPP

KNP

KOP

KQP

00F

460

00003249202

00000000000

00003249202

0100000000000

0000100000000

0

9

8

8

9

010

009

00003249202

00000000000

00003240202

0100000000000

0000100000000

1

9

8

8

9

011

7E9

00003249202

00000000000

00003249202

0100000000000

0000100000000

1

9

8

8

9

012

204

00003249202

00000000000

00003249202

0100000000000

0000100000000

1

9

8

8

9

013

41C

00003249202

00000000000

00003249202

0100000000000

0000100000000

1

9

9

9

9

014

253

00003249202

00000000000

00003249202

0100000000000

0000100000000

1

9

9

8

9

015

239

00003249202

00000000000

00003249202

0100000000000

0000100000000

1

9

9

7

9

016

23C

00003249202

00000000000

00003249202

0100000000000

0000100000000

1

9

9

6

9

017

256

00003249202

00000000000

00003249202

0100000000000

0000100000000

1

9

9

5

9

018

23B

00003249202

00000000000

00003249202

0100000000000

0000100000000

1

9

9

4

9

019

23C

00003249202

00000000000

00003249202

0100000000000

0000100000000

1

9

9

3

9

01A

204

00003249202

00000000000

00003249202

0100000000000

0000100000000

1

9

9

2

9

01B

241

00003240202

00000000000

00003249202

0100000000000

0000100000000

1

9

9

1

9

01C

242

00003249202

00000000000

00003249202

0100000000000

0000100000000

1

9

9

0

9

01D

23C

00003249202

00000000000

00003249202

0100000000000

0000100000000

1

9

9

0

9

01E

703

00003249202

00000000000

00003249202

0101000000000

0000100000000

1

9

9

0

9

01F

7E4

00003249202

00000000000

00003249202

0101000000000

0000100000000

0

9

9

0

9

020

025

00003249202

00000000000

00003249202

0101000000000

0000100000000

1

9

9

0

9

021

401

00000000000

00000000000

00003249202

0101000000000

0000100000000

1

9

9

0

9

022

764

00000000000

00000000000

00003249202

0101000000000

0000100000000

1

9

9

0

9

023

76A

00000000000

00000000000

00003249202

0101000000000

0000100000000

1

9

9

0

9

024

76B

00000000000

00000000000

00003249202

0101000000000

0000100000000

1

9

9

0

9

025

7C3

00000000000

00000000000

00003249202

0101000000000

0000100000000

0

9

9

0

9

026

22A

00000000000

00000000000

00003249202

0101000000000

0000100000000

1

9

9

0

9

02A

743

00000000000

00000000000

00003249202

0100000000000

0000100000000

1

9

9

0

9

02B

564

00000000000

00000000000

00003249202

0100000000000

0000100000000

0

9

9

0

9

02C

02F

00000000000

00000000000

00003249202

0100000000000

0000100000000

1

9

9

0

9

02D

624

00000000000

00000000000

00003249202

0100000000000

0000100000000

0

9

9

0

9

02E

231

00000000000

00000000000

00003249202

0100000000000

0000100000000

1

9

9

0

9

031

7E3

00000000000

00000000000

00003249202

0100000000000

0000100000000

1

9

9

0

9

032

034

00000000000

00000000000

00003249202

0100000000000

0000100000000

1

9

9

0

9

034

485

00000000000

00000000000

00003249202

0100000000000

0000100000000

1

9

9

0

9

035

400

00000000000

00000000000

00003249202

0100000000000

0000000000000

1

9

9

9

9

036

4E1

00000000600

00000000000

00003249202

0100000000000

0000000000000

0

9

5

9

9

037

4C5

00000000700

00000000000

00003249202

0100000000000

0000000000000

0

9

5

9

9

038

204

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

5

9

9

004

400

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

9

9

9

005

762

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

9

9

9

006

400

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

9

9

9

007

460

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

8

8

9

008

204

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

8

8

9

009

400

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

9

9

9

00A

460

00000000700

00000000000

00003249202

0100000000000

0000000000000

0

9

8

8

9

00B

400

00000000700

00000000000

00003249202

0100000000000

0000000000000

0

9

9

9

9

00C

009

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

9

9

9

00D

400

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

9

9

9

00E

400

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

9

9

9

00F

460

00000000700

00000000000

00003249202

0100000000000

0000000000000

0

9

8

8

9

010

009

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

8

8

9

011

7E9

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

8

8

9

012

204

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

8

8

9

013

41C

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

9

9

9

014

253

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

9

8

9

015

239

00000000700

00000000000

00003249202

0100000000000

0000000000000

1

9

9

7

9

039

723

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

7

9

03A

01F

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

7

9

01F

7E4

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

7

9

020

025

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

7

9

025

7C3

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

7

9

026

22A

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

7

9

027

5C1

00000000701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

7

9

028

5E5

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

7

9

029

004

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

7

9

004

400

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

005

762

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

006

400

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

007

460

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

8

8

9

008

204

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

8

8

9

009

400

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

00A

460

00000000700

00000000000

00003249202

0100000000000

0001000000000

0

9

8

8

9

00B

400

00000000700

00000000000

00003249202

0100000000000

0001000000000

0

9

9

9

9

00C

009

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

00D

400

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

00E

400

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

00F

460

00000000700

00000000000

00003249202

0100000000000

0001000000000

0

9

8

8

9

010

009

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

8

8

9

011

7E9

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

8

8

9

012

204

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

8

8

9

013

41C

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

014

253

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

8

9

015

239

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

7

9

016

23C

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

6

9

017

256

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

5

9

018

23B

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

4

9

019

23C

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

3

9

01A

204

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

2

9

01B

241

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

1

9

01C

242

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

01D

23C

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

01E

703

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

01F

7E4

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

020

025

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

025

7C3

00000000700

00000000000

00003249202

0100000000000

0001000000000

0

9

9

0

9

026

22A

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

02A

743

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

02B

564

00000000700

00000000000

00003249202

0100000000000

0001000000000

0

9

9

0

9

02C

02F

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

02D

624

00000000700

00000000000

00003249202

0100000000000

0001000000000

0

9

9

0

9

02E

231

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

031

7E3

00000000700

00000000000

00003249202

0100000000000

0001000000000

0

9

9

0

9

032

034

00000000700

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

033

5C5

00000000701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

034

485

00000007001

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

035

400

00000007001

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

036

4E1

00000007601

00000000000

00003249202

0100000000000

0001000000000

0

9

5

9

9

037

4C5

00000007701

00000000000

00003249202

0100000000000

0001000000000

0

9

5

9

9

038

204

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

5

9

9

004

400

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

005

762

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

006

400

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

007

460

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

8

8

9

008

204

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

8

8

9

009

400

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

00A

460

00000007701

00000000000

00003249202

0100000000000

0001000000000

0

9

8

8

9

00B

400

00000007701

00000000000

00003249202

0100000000000

0001000000000

0

9

9

9

9

00C

009

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

00D

400

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

00E

400

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

00F

460

00000007701

00000000000

00003249202

0100000000000

0001000000000

0

9

8

8

9

010

009

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

8

8

9

011

7E9

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

8

8

9

012

204

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

8

8

9

013

41C

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

9

9

014

253

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

8

9

015

239

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

7

9

016

23C

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

6

9

017

256

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

5

9

018

23B

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

4

9

019

23C

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

3

9

01A

204

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

2

9

01B

241

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

1

9

01C

242

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

01D

23C

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

01E

703

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

01F

7E4

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

020

025

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

025

7C3

00000007701

00000000000

00003249202

0100000000000

0001000000000

0

9

9

0

9

026

22A

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

02A

743

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

02B

564

00000007701

00000000000

00003249202

0100000000000

0001000000000

0

9

9

0

9

02C

02F

00000007701

00000000000

00003249202

0100000000000

0001000000000

1

9

9

0

9

02D

624

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03249200027

0100000000000

0001000000100

1

9

9

9

8

0FB

279

−25311268027

03249200027

03249200027

0100000000000

0001000000100

1

9

9

9

8

0FC

741

−25311268027

03249200027

03249200027

0000000000000

0001000000100

1

9

9

9

8

0FD

742

−25311268027

03249200027

03249200027

0000000000000

0001000000100

1

9

9

9

8

0FE

079

−25311268027

03249200027

03249200027

0000000000000

0001000000100

1

9

9

9

8

079

524

−25311268027

03249200027

03249200027

0000000000000

0001000000100

1

9

9

9

8

07A

29F

−25311268027

03249200027

03249200027

0000000000000

0001000000100

1

9

9

9

8

07B

542

−25311268027

01000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

07C

48A

−25311268027

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

07D

4B0

−25311268027

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

07E

283

−25311268027

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

07F

4A5

−02531126827

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

080

7EB

−02531126827

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

081

28E

−02531126827

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

082

585

−02531126837

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

083

624

−02531126837

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

084

290

−02531126837

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

085

564

−02531126837

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

086

0A0

−02531126837

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

0A0

7C0

−02531126837

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

0A1

100

−02531126837

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

100

5A4

−02531126837

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

101

30C

−02531126837

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

102

5A5

−02531126827

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

103

7EB

−02531126827

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

104

2FF

−02531126827

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

105

664

−02531126827

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

106

30A

−02531126827

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

10A

5E5

−02531126826

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

10B

100

−02531126826

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

100

5A4

−02531126826

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

101

30C

−02531126826

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

102

5A5

−02531126816

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

103

7EB

−02531126816

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

104

2FF

−02531126816

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

105

664

−02531126816

10000000027

03249200027

0000000000000

0001000000100

0

9

9

9

8

106

30A

−02531126816

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

10A

5E5

−02531126815

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

10B

100

−02531126815

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

100

5A4

−02531126815

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

101

30C

−02531126815

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

102

5A5

−02531126805

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

103

7EB

−02531126805

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

104

2FF

−02531126805

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

105

664

−02531126805

10000000027

03249200027

0000000000000

0001000000100

0

9

9

9

8

106

30A

−02531126805

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

10A

5E5

−02531126804

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

10B

100

−02531126804

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

100

5A4

−02531126804

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

101

30C

−02531126804

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

10C

76B

−02531126804

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

10D

7E9

−02531126804

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

10E

31E

−02531126804

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

10F

4E4

−02531126804

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

110

116

−02531126804

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

116

7E1

−02531126804

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

117

31E

−02531126804

10000000027

03249200027

0000000000000

0001000000100

1

9

9

9

8

118

418

−10000000027

02531126804

03249200027

0000000000000

0001000000100

1

9

9

9

8

119

401

−00000000000

02531126804

03249200027

0000000000000

0001000000100

1

9

9

9

8

11A

400

−00000000000

02531126804

03249200027

0000000000000

0001000000100

1

9

9

9

9

11B

420

−00000000000

02531126804

03249200027

0000000000000

0001000000100

1

9

9

9

9

11C

321

−00000000000

02531126804

03249200027

0000000000000

0001000000100

1

9

9

9

9

11D

418

−02531126804

00000000000

03249200027

0000000000000

0001000000100

1

9

9

9

9

11E

7C7

−02531126804

00000000000

03249200027

0000000000000

0001000000100

1

9

9

9

9

11F

250

−02531126804

00000000000

03249200027

0000000000000

0001000000100

1

9

9

9

9

120

049

−02531126804

00000000000

03249200027

0000000000000

0001000000100

1

9

9

9

9

049

407

−02531126804

00000000000

02531126804

0000000000000

0001000000100

1

9

9

9

9

04A

74A

−02531126804

00000000000

02531126804

0000000000000

0001000000100

1

9

9

9

9

04B

7EA

−02531126804

00000000000

02531126804

0000000000000

0001000000100

0

9

9

9

9

04C

04E

−02531126804

00000000000

02531126804

0000000000000

0001000000100

1

9

9

9

9

04D

70A

−02531126804

00000000000

02531126804

0000000000000

0001000000100

1

9

9

9

9

04E

6C1

−02531126804

00000000000

02531126804

0000000000100

0001000000100

1

9

9

9

9

04F

6C2

−02531126804

00000000000

02531126804

0000000000100

0001000000100

1

9

9

9

9

050

763

−02531126804

00000000000

02531126804

0000000000100

0000000000100

1

9

9

9

9

051

724

−02531126804

00000000000

02531126804

0000000000100

0000100000100

1

9

9

9

9

052

004

−02531126804

00000000000

02531126804

0000000000100

0000100000100

1

9

9

9

9

004

400

−02531126804

00000000000

02531126804

0000000000100

0000100000100

1

9

9

9

9

005

762

−02531126804

00000000000

02531126804

0000000000100

0000100000100

1

9

9

9

9

006

400

−02531126804

00000000000

02531126804

0000000000100

0000100000100

1

9

9

9

9

007

460

−02531126804

00000000000

02531126804

0000000000100

0000100000100

1

9

8

8

9

008

204

−02531126804

00000000000

02531126804

0000000000100

0000100000100

1

9

8

8

9

009

400

−02531126804

00000000000

02531126804

0000000000100

0000100000100

1

9

9

9

9

00A

460

−02531126804

00000000000

02531126804

0000000000100

0000100000100

0

9

8

8

9

00B

400

−02531126804

00000000000

02531126804

0000000000100

0000100000100

0

9

9

9

9

00C

009

−02531126804

00000000000

02531126804

0000000000100

0000100000100

1

9

9

9

9

00D

400

−02531126804

00000000000

02531126804

0000000000100

0000100000100

1

9

9

9

9

00E

400

−02531126804

00000000000

02531126804

0000000000100

0000100000100

1

9

9

9

9

TABLE VIII

FIG. 22A

gives a key to the flowchart notation; the shape of the box is used to distinguish the various classes of instructions, and the inscriptions in the box are used to specify the particular instruction within the indicated class.

The circular symbol is used for labels, as for example, the GO and CONT labels on FIG.

22

A. Rectangles symbolize assignments. For register operations arrow notation is used with subscripts indicative of the Digit Mask. For flag operations, with the extra-lined rectangle, the instruction is given, along with either mneomic or alpha numeric identification of the flag(s) to be so modified. The oval symbol is used for all test operations, including Test Flag, Compare Flag, and Compare Register instructions. The diamond symbol is used for Branch Conditional instructions, where the indicated conditions relate to the preceding test or register (carry/borrow) operation. The hexagonal symbol is used for WAIT operations. In addition to the WAIT condition, for example, D

11

or KN, associated operations, for example Add One, are also indicated.

Referring to

FIG. 22B through T

, the program flowcharts can be corresponded to the linear program Table VI as follows;

In Table VI the first three-digit column counts the ROM locations (PC values) in hexadecimal code from 000

16

(0

10

) through

13

F

16

(319

10

). The next eleven-bit column reflect the binary-code contents of the ROM which is programmed at each of the PC locations, that is the IR code which would be detected and executed if the PC value became equivalent to that indicated, row by row. The next column gives programming labels by which some routines are known. The next column gives the instruction mnemonic, as described in the functional description section above. The remainder of the table is devoted to comments relating to the operational meaning of the instructions, as appropriate. The ROM locations of individual instructions on the flowcharts

FIG. 22

are indicated by the three-digit hexadecimal codes in proximity of the instruction symbol.

Referring to

FIG. 22B

, the basic control routine is shown which connects the four basic operation (, , ×, ÷) routines and determines the current operation and previous operation status by means of the flag test and update decision tree shown. The linear program is given in Table VI beginning at location

040

, label MIN (corresponding to ) continuing through location

057

, with an “always branch” to LOCK.

Referring to

FIG. 22C

, the routines for Clear Entry (CE), Decimal Point (DPT), Clear (C), and Data Entry are shown. Clear is located at

000

through

003

and provides means to clear all flags and the A and C registers, returning to LOCK. Clear Entry is at location

058

and branches to the 02 routine at 021 to clear the A register and related flags. Data Entry is the control routine for input of number key and decimal point switch routines, beginning at location

01

E.

Referring to

FIG. 22D

, all operating routines terminate in LOCK which provides means for suppression of double-key entry and multiple execution of single operation entries by testing for quiescence (open-circuit) of all momentary keyboard inputs. LOCK resides at locations

004

through

008

, branching to IDLE on confirmation of quiescence. In two WAIT loops at locations

009

through

010

, IDLE provides means for defeating leading-edge key bounce and transient noise.

Referring to

FIG. 22E

, OPN provides means for polling of keyboard operation inputs (K

0

Keys) to determine which operation is being requested. This is accomplished with a list of Branch Conditional instruction, where the sequence of their execution corresponds to the order of key connections to the Digit scanning outputs, and by means of the WAID D

11

instruction to synchronize the polling to the scan cycle, and by association of K

0

→Cond with the WAIT instruction to permit conditional branching on the state of the keyboard inputs. OPN is located between

011

and

01

D on the ROM and terminates with a jump to Data Entry for numeric inputs, if no previous jump is executed.

Referring to

FIG. 22F

, NBR provides means for polling and scan-encoding the numeric keyboard inputs, for example number keys and Point Position Switches. This is done by the single instruction WAIT (D

11

+KN) at location

03

A by means of association of (A−1 A) to subtract “one” from the mantissa of A for each instruction cycle of the wait.

Referring to

FIGS. 22G

, H, I, J, K, L, and M, the Add/Subtract (AS) and Prenormalize (PRE) are shown. These routines involve a variety of testing and formating procedures in addition to the actual performance of ADD or SUBTRACT.

Referring to

FIGS. 22N

, O,P,Q,R,S, and T, the Multiply/Divide (MD) and Postnormalize (POST) are shown. These routines employ repetitive additions and subtractions in combination with shift, test, and counting procedures in order to accomplish the desired function.

FIG. 23

illustrates the physical relationship between the above described signals and functions of the present embodiment and the packaging techniques of contemporary integrated circuit technology. For example, the input/output terminals of the present embodiment can be connected to a ceramic or plastic package lead frame using wire conductors and thermal compression bonding to provide means for allowing th system to become more accessible to conventional DIP/printed circuit board handling and usage.

In the described MOS embodiment of the calculator system of the invention, V

SS

-V

DD

and V

DD

-V

GG

are for example, nominally 7.2 volts under normal operating conditions (8.1 volts maximum; 6.6 volts minimum). The clock (φ) frequency is nominally 250 KHz, minimum 200 KHz and maximum 330 KHz.

Programming of the Calculator System for Non-Calculator Functions

The calculator system of the present invention is a variable function calculator system in that it may be programmed to perform functions other than the desk top calculator functions previously described. The variable functionability of the system is essentially provided by the programmability of various subsystems such as the programmable read-only-memory and the programmable logic arrays utilized in the system. As previously stated, these programmable subsystems are programmed during the fabrication of MOS or MIS embodiments by merely modifying the gate-insulator mask.

In further calculator embodiments, a large number of diverse functions utilizing additional keys on a keyboard and/or additional programs stored in the ROM could provide a system including, for example, right shift, exchange operand, square root, expontial operations, logarithmic operations, double and triple zero operation, and key sequence recognition.

Being that the calculator system of the invention includes program control, data control arithmetic and logic means and input/output subsystems in various embodiments the system may be programmed to perform non-calculator functions. For example, the calculator system may be programmed to perform meter functions such as for a digital volt meter, event counting, meter smoothing, taxi-fare meter, an odometer, scale meter to measure weight, etc. The system may also be programmed to perform cash register operations, act as a controller, arithmetic teaching unit, clock, display decoder, automobile rally computer, etc.

Several embodiments of the invention have now been described in detail. It is to be noted, however, that these descriptions of specific embodiments are merely illustrative of the principles underlying the inventive concept. It is contemplated that various modifications of the disclosed embodiments, as well as other embodiments of the invention will, without departing from the spirit and scope of the invention, be apparent to persons skilled in the art.

Number	Name	Date
3757308	Fosdick	Sep 1973
3760171	Wang et al.	Sep 1973
4001566	Stevenson	Jan 1977
4037090	Raymond, Jr.	Jul 1977
4074351	Boone et al.	Feb 1978
4242675	Boone et al.	Dec 1980
4326265	Boone	Apr 1982
4342094	Boone	Jul 1982
4471460	Boone	Sep 1984
4471461	Boone	Sep 1984
4476541	Boone	Oct 1984
4485455	Boone et al.	Nov 1984
4554641	Haneda et al.	Nov 1985
4942516	Hyatt	Jul 1990

	Number	Date	Country
Parent	07/325703	Mar 1989	US
Child	07/473541		US
Parent	07/097489	Sep 1987	US
Child	07/325703		US
Parent	06/750647	Jun 1985	US
Child	06/915857		US
Parent	06/604404	Apr 1984	US
Child	06/750647		US
Parent	06/002815	Jan 1979	US
Child	06/604404		US
Parent	05/420999	Dec 1973	US
Child	05/856932		US
Parent	05/163565	Jul 1971	US
Child	05/420999		US

Variable function programmed system

Information

Patent Number

Date Filed

Date Issued

Inventors

Original Assignees

Examiners

Agents

US Classifications

Field of Search

US

International Classifications

Abstract

Description

Claims

CROSS-REFERENCE TO RELATED APPLICATIONS

US Referenced Citations (14)

Continuations (7)