Video sound and system control circuit

Details Video sound and system control circuit Video sound and system control circuit

1983-06-03

1986-02-04

Harkcom, Gary V.

Boots, shoes, and leggings

364521, 364900, 3645135, 358903, G06F 1544, G06F 3153

Patent

active

045690197

ABSTRACT:
Programmable I/O (input/output) interface circuitry provides video and audio signals, needed for a video computer/game, to a commercial color television type display/monitor and may be implemented in HMOS, (H type metal oxide semiconductor) large-scale-integrated circuitry. The system architecture allows for reduced chip count, and improved reliability while providing adequate synchronization pulses, luminance level signals, chrominance phase shift signals, raster control and cursor control video and three independently controlled audio voices. A software selectable keyboard latch input, plural speed processing for faster operation when outside the active display area or during blanking, all system control signals necessary for system operation and 3 independently controlled interrupt generating timers are also provided.

REFERENCES:
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patent: 4053740 (1977-10-01), Rosenthal
patent: 4180805 (1979-12-01), Burson
patent: 4296476 (1981-10-01), Mayer et al.
patent: 4344148 (1982-08-01), Brantingham et al.
patent: 4445187 (1984-04-01), Best
patent: 4471464 (1984-09-01), Mayer et al.
patent: 4475228 (1984-10-01), Vickers

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