Peripheral control circuitry for personal computer
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United States of America Patent
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May 9, 1989
Grant Date -
N/A
app pub date -
Jul 18, 1986
filing date -
Jul 18, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A peripheral control circuit for a computer system. Independent control and interface circuits are provided for left and right audio channels, for a communications port, for storage media, and for joysticks or paddles. Control logic is provided for direct memory access to system memory and for interrupts to the processor by each of the peripherals. Sound data corresponding to a sound waveform during a particular time period is fetched using DMA or interrupts. Registers store data for selecting the output rate of the sound data, the length of the sound waveform, and the volume of the sound waveform. Four audio channels and two separate audio ports are provide.
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