Key input data emulation system
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United States of America Patent
Stats
-
Dec 1, 1987
Grant Date -
N/A
app pub date -
Feb 26, 1985
filing date -
Feb 29, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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