Keyboard interface

Details Keyboard interface Keyboard interface

1989-08-22

1992-09-08

Fleming, Michael R.

Boots, shoes, and leggings

364DIG1, 364234, 3642341, 3642398, 364264, 3642646, G06F 1502, G06F 302, G06F 1128

Patent

active

051465671

ABSTRACT:
A computer keyboard interface is disclosed with an improved system for controlling the signals on a clock line and a data line for communication between the keyboard interface and the system interface. Two bi-directional input/output ports are used, one for the clock line and one for the data line. The data and clock lines are then used not only for the transmission of data but also used by the keyboard interface for sensing status signals from the system interface. This simplifies the keyboard interface design.

REFERENCES:
patent: 3774161 (1973-11-01), Chambers
patent: 3872446 (1975-03-01), Chambers
patent: 4460957 (1984-07-01), Eggebrecht et al.
patent: 4482955 (1984-11-01), Amano et al.
patent: 4513390 (1985-04-01), Walter et al.
patent: 4523298 (1985-06-01), Sakurai
patent: 4527250 (1985-07-01), Galdun et al.
patent: 4644497 (1987-02-01), Tajima et al.
patent: 4814712 (1989-03-01), Burton et al.
patent: 5056057 (1991-10-01), Johnson et al.

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