Claims
- 1. In an electronic postage which includes a processing means and a first and second non-volatile memory connected to the processing means, the first and second memory means arranged for storing critical accounting information received from the processing means, security apparatus for providing security to the critical accounting information within the first and second non-volatile memory means, the security apparatus comprising,
- means connected to the first and second memory means for limiting the amount of time the first or second memory means is enabled by said processing means,
- means connected to the limiting means for preventing the simultaneous enabling of the first and second non-volatile memory means, and
- means connected to the first and second memory means for preventing writing to either of the non-volatile memory means before a non-volatile memory means is selected by the processing means.
- 2. In an electronic postage meter which includes a processing means and a first and a second non-volatile memory means connected to the processing means, the improvement comprising security apparatus connected to said processing means and said first and second non-volatile memory means, said security apparatus limiting the amount of time for writing into said non-volatile memory means to a predetermined time interval after a non-volatile memory selection signal has enabled writing to said non-volatile memory means.
Parent Case Info
This application is a continuation of U.S. application Ser. No. 122,580, filed Nov. 16, 1987, now abandoned which was a continuation of U.S. application Ser. No. 710,802 filed Mar. 12, 1985 now abandoned.
US Referenced Citations (19)
Continuations (2)
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Number |
Date |
Country |
Parent |
122580 |
Nov 1987 |
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Parent |
710802 |
Mar 1985 |
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