Video sound and system control circuit
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United States of America Patent
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-
Feb 4, 1986
Grant Date -
N/A
app pub date -
Jun 3, 1983
filing date -
Jun 3, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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