Serial keyboard interface system with frame retransmission after

Details Serial keyboard interface system with frame retransmission after Serial keyboard interface system with frame retransmission after

1983-12-08

1987-02-17

William, Archie E.

Boots, shoes, and leggings

371 32, 371 61, 340365S, 340365E, G06F 1502, G06F 302, G06F 3023, G06F 1100

Patent

active

046444971

ABSTRACT:
A keyboard interface for a data processing system in which a keyboard and a data processor unit are connected through a single clock line for transmitting a clock signal from the keyboard and a single data line for transmitting a serial bit frame having a serial scan code identifying a depressed key in synchronism with the clock signal. The interface uses an error detection and retransmission procedure to correct errors due to noise pulses which are induced on the clock line as by electrostatic discharge and give rise to extra data sampling. The data processing system returns a status signal acknowledging the receipt of a frame to the keyboard via the data line immediately after the number of sampled bits received reaches the predetermined number of bits of a frame. The keyboard checks whether the status signal has been returned after the completion of transmission of a frame and, if not, the same serial scan code is retransmitted.

REFERENCES:
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patent: 4354252 (1982-10-01), Lamb et al.
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patent: 4523297 (1985-06-01), Ugon
patent: 4523298 (1985-06-01), Sakurai
patent: 4527250 (1985-07-01), Galdun
patent: 4532416 (1985-07-01), Berstein
patent: 4536647 (1985-08-01), Atalla et al.

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