Emulation circuit for interfacing joystick to ROM cartridge slot

Details Emulation circuit for interfacing joystick to ROM cartridge slot Emulation circuit for interfacing joystick to ROM cartridge slot

1987-07-27

1989-09-19

Williams, Jr., Archie E.

Boots, shoes, and leggings

36470909, 364926, 3649261, 36492799, 36492781, G06F 1314, G06F 3033, G06F 944

Patent

active

048687804

ABSTRACT:
A circuit providing a joystick interface to a computer. The circuit plugs into the cartridge slot of the computer and receives power from the computer. The circuit includes an analog interface circuit, a read only memory (ROM) containing both a machine language program to drive the analog interface circuit, and a machine language application program. The analog interface circuit includes an analog-to-digital converter, a clock circuit, and a decoder. The circuit of the present invention also includes a tri-state bus interface circuit to communicate the state of input switches to the computer.

REFERENCES:
patent: 4148014 (1979-04-01), Burson
patent: 4180805 (1979-12-01), Burson
patent: 4306232 (1981-12-01), Burson
patent: 4349708 (1982-09-01), Asher
patent: 4488017 (1984-12-01), Lee
patent: 4520355 (1985-05-01), Mitch
patent: 4638451 (1987-01-01), Hester et al.
R. A. Dayan et al, "Joystick Alternate to Cursor Control Keys", IBM Technical Disclosure Bulltin, vol. 27, No. 10E, Mar. 1985-pp. 6209-6210.

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