Key input data emulation system

Details Key input data emulation system Key input data emulation system

1985-02-26

1987-12-01

Eng, David Y.

Boots, shoes, and leggings

364709, G06F 700

Patent

active

047108690

ABSTRACT:
In a keyboard emulation system of the invention, a keyboard emulation circuit is inserted beteen two microprocessors. The keyboard emulation circuit generates a signal for sequentially scanning a key switch matrix constituting a keyboard unit. The keyboard emulation circuit has a keyboard controller of a matrix scan type for generating a key input code by a return signal, a register for setting a key input code by a master microprocessor, and a comparator for receiving an output from the register and a scan signal for comparing them. The master processor emulates a keyboard interface of the slave processor and performs a key input to the slave processor by the keyboard connected to the master processor.

REFERENCES:
patent: 4377852 (1983-03-01), Thompson
patent: 4453211 (1984-06-01), Askinazi et al.
patent: 4458311 (1984-07-01), Clements et al.

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