Computer-monitor extended range communications link for attenuat

Details Computer-monitor extended range communications link for attenuat Computer-monitor extended range communications link for attenuat

1989-12-05

1993-03-09

Lee, Thomas C.

Boots, shoes, and leggings

395325, 3649272, 3649352, 3649355, 364940, 364DIG2, 364234, 3642372, 340711, 375 36, G06F 300, G06F 314

Patent

active

051932008

ABSTRACT:
A communications extension link for use between a computer and display unit (K.D.U.) has at the computer site a first interface circuit connected to it and adjacent to the keyboard and display unit a second interface circuit connected to it. The two interface circuits may then be spaced up to 300 feet for a monochrome K.D.U. and up to 150 feet for a color K.D.U. by an extension cable. The first interface circuit includes capacitors connected between keyboard data and clock lines and a positive supply terminal, and TTL buffer amplifiers coupled in single ended configuration are placed in the signal lines relating to video information transmission. The video signals (VS, HS, primary RGB and second rgb) are then each attenuated prior to being passed over the longest cable run, after which they are received by a second interface circuit. The second interface circuit employs discrete resistors between clock and data lines and the positive supply terminal with the attenuated video signals received by discrete buffer amplifiers which amplify the signal and make it compatible with TTL inputs of the monitor. In addition, capacitance is added between the positive supply terminal and logic ground.

REFERENCES:
patent: 3657478 (1972-04-01), Andrews, Jr.
patent: 3691295 (1972-09-01), Fisk
patent: 3925776 (1975-12-01), Swallow
patent: 4476543 (1984-10-01), Quinones et al.
patent: 4520356 (1985-05-01), O'Keefe et al.
patent: 4665501 (1987-05-01), Saldin et al.
patent: 4907146 (1990-03-01), Caporali
patent: 4974075 (1990-11-01), Nakajima

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