| Data Sheet for Silicon Systems SSI204 5V Low Power DTMF Receiver. |
| Data Sheet for Motorola MC68HC805B6 8-Bit Microcontroller Unit. |
| Data Sheet for NEC Radiopager Mark III Tone and Voice Type. |
| Specification for a Standard Code Format for use in Wide Area Radio Paging Systems. |
| Data Sheet for Siemens DL1814 Alphanumeric Intelligent Display. |
| B. Sherwin, Fans Must Call Right Plays in TV-Football Game, Seattle Times (Oct. 11, 1987). |
| R. Lyke, Bars, Lounges Score Big With Sports/Trivia Video Game, Hotel & Motel Management (Jun. 13, 1988). |
| J. Takiff, Talking Back to Your TV, The Philadelphia Daily News (Nov. 4, 1988). |
| J. Krupinski, Calling the (Electronic) Signals, Long Island Newsday (Jan. 1989). |
| What Bar Patrons See as Trivia, Owners Discovery is a Pot of Gold, New York Times (Jul. 9, 1989). |
| C. Smith, Bar Bosses See New Trivia Game Filling More Seats, The Vancouver Sun (Feb. 21, 1990). |
| A. Pollack, New Interactive TV Threatens the Bliss of Couch Potatoes, New York Times (Jun. 18, 1990). |
| NTN.TM. Entertainment Network Brochure, NTC Communications, Inc. (1989). |
| The NTN Monitor, vol. 2, No. 6 (Jun. 1990). |
| NTN Programming Listing (Not dated, but prior to Jun. 22, 1990). |
| Rollie Fingers' Diamond Ball Notes (Not dated, but prior to Jun 22, 1990). |