Keyboard scan code translation system and method

Details Keyboard scan code translation system and method Keyboard scan code translation system and method

1996-11-19

1997-08-19

Hofsass, Jeffery

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 23, 36470916, H03K 1794

Patent

active

056593082

ABSTRACT:
Scan code generation for portable personal computers (PCs) using a matrix keyboard operates to produce keyboard output scan codes corresponding to IBM.RTM. compatible PC/AT scan codes. Key numbers are assigned to one or the other of two classes (simple and complex). Two classes of scan code translation tables (simple and complex) are stored in memory, either ROM or internal RAM memory. Whenever a simple key is operated, the simple table is accessed. The complex scan code table is addressed, in accordance with a set of seven edit rules, utilized in conjunction with the state of operation of multiple keys on the keyboard, to determine the appropriate translation. All of the logic needed to generate the necessary scan codes is collapsed into a structured table-driven mechanism.

REFERENCES:
patent: 3706973 (1972-12-01), Acquadro et al.
patent: 4470038 (1984-09-01), Amano et al.
patent: 5450078 (1995-09-01), Silva et al.
patent: 5486823 (1996-01-01), Tsai

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