Memory mapped keyboard controller

Details Memory mapped keyboard controller Memory mapped keyboard controller

1994-09-27

1997-06-24

Zimmerman, Brian

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

400479, 36470912, H04Q 100

Patent

active

056421109

ABSTRACT:
A memory mapped keyboard controller within a peripheral controller for use in an Industry Standard Architecture (ISA) computer provides a method and apparatus for efficiently monitoring and reading a keyboard switch matrix. In a first mode of operation, the controller activates all the columns and monitors all the rows in the switch matrix to detect when any one or more of the rows becomes active, indicating that at least one key on the keyboard has been pressed. When any row in the matrix is detected as active, then the keyboard controller enters a second mode wherein it selectively activates individual columns and monitors the rows in the switch matrix to detect which row and column contain the activated switch. When the switch location is determined, this location is interpreted by the keyboard controller into a scan code for the ISA computer.

REFERENCES:
patent: 4266278 (1981-05-01), Ebihara et al.
patent: 4277780 (1981-07-01), Sanderman et al.
patent: 4305065 (1981-12-01), Mogi
patent: 4409665 (1983-10-01), Tubbs
patent: 4590556 (1986-05-01), Berger et al.
patent: 4591833 (1986-05-01), Ishii et al.
patent: 4679166 (1987-07-01), Berger et al.
patent: 4698748 (1987-10-01), Juzswik et al.
patent: 4703420 (1987-10-01), Irwin
patent: 4716526 (1987-12-01), Mori et al.
patent: 4757505 (1988-07-01), Marrington et al.
patent: 4758945 (1988-07-01), Remedi
patent: 4841440 (1989-06-01), Yonezu et al.
patent: 4851987 (1989-07-01), Day
patent: 4888680 (1989-12-01), Sander et al.
patent: 4942606 (1990-07-01), Kaiser et al.
patent: 4943911 (1990-07-01), Kopp et al.
patent: 4945473 (1990-07-01), Hotley et al.
patent: 4959860 (1990-09-01), Watters et al.
patent: 4980836 (1990-12-01), Carter et al.
patent: 5038275 (1991-08-01), Dujari
patent: 5041964 (1991-08-01), Cole et al.
patent: 5083266 (1992-01-01), Watanabe
patent: 5237692 (1993-08-01), Raasch et al.
patent: 5261114 (1993-11-01), Raasch et al.
Translation of Abstract of Japanese Publication No. 3136143 Sep. 9, 1991; Mamoru.
Dr. Dobb's Journal, No. 76, Hank Harrison. "CP/M-80 Expansion Card for the Victor 9000 and IBM PC", pp. 58-59 and 61 (note specifically p. 59 top left column). Feb. 1983.
Elector Electronics, vol. 17, No. 185, Canterbury GB, pp. 50-51, Kyte. "8031 In-Circuit Emulator", Jan. 1991.
Intel 82347 Power Management PC Peripheral Preliminary Data Sheet, May 1990.
Microprocessor Peripherals UPI.TM.-41A/41AH/42/42AH Users Manual, Intel.RTM. Corporation, 1989.
80C51SL-AG Keyboard Controller, Intel.RTM. Corporation, Sep. 1990.
80C51SL-BG Keyboard Controller, Intel.RTM. Corporation, Feb. 1991.

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