Keyboard and controller with a three wire half duplex asynchrono

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395275, 364DIG1, 364234, 364228, 3642383, G06F 1100

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active

053613767

ABSTRACT:
A controller and communications architecture for controlling the operation of computer I/O devices such as a keyboard or the like includes two microprocessors, a three-wire half duplex communications interface and a transmission protocol allow data transmission, error, detection and contention resolution. The transmission protocol allows the microprocessors to transmit serial data over the interface which includes a single shared data line and two simplex clock lines.

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patent: 5214785 (1993-05-01), Fairweather
EIA Standard Electronic Industries Association, Jan. 1987; pp. 20 and 28-29.
Mini-Micro Systems, vol. XX, No. 11, Nov. 1987, Netown, Mass. US pp. 65-66.
Anon: "Focus on Apple Part IV-The Apple Desktop Bus" IBM Technical Disclosure Bulletin, vol. 31, No. 12, May 1989, Armonk, N.Y., US pp. 228-231.
Anon: "Simplified Asynchronous Communications Interface Network".

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