Computer graphics processing and selective visual display system – Display peripheral interface input device – Including keyboard
Patent
1997-05-19
1999-10-26
Hjerpe, Richard A.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Including keyboard
345172, 341 22, 341 26, 364189, G09G 500
Patent
active
059736755
ABSTRACT:
An information processing apparatus is capable of using more than one type of keyboard with a single keyboard controller without increasing the production cost. In a keyboard matrix, a key scanning line C0 is arranged so that the key scanning line C0 is only connected to any one of key return lines R0 to R7 through a key switch having a key switch number G01. The key switch number G01 is assigned for the key [F1] which is common to keyboards having different key arrangements. When the information processing apparatus is activated, a keyboard initializing program is activated by depressing the [F1] key. As a result, the information processing apparatus identifies the type of the keyboard by detecting a key return line R from which a signal is returned when scanning is made upon the depression of the [F1] key.
REFERENCES:
patent: 5450080 (1995-09-01), Irwin
patent: 5459462 (1995-10-01), Venkidu et al.
patent: 5610601 (1997-03-01), Lahti et al.
patent: 5631643 (1997-05-01), Hisamori et al.
patent: 5717428 (1998-02-01), Barrus et al.
Joto Takuma
Sakai Takeshi
Hjerpe Richard A.
Sharp Kabushiki Kaisha
Tran Henry N.
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