Hardware input/output control apparatus for use in a computer system which control apparatus is joined to a plurality of input/output devices, and includes circuitry which responds to commands from unprivileged application programs addressed to input/output devices joined to the hardware input/output apparatus for selecting a context to be placed on an addressed input/output device to function with an application program sending the command.

 
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< Method for providing high quality audio by storing wave tables in system memory and having a DMA controller on the sound card for transferring the wave tables

> DMA controller translates virtual I/O device address received directly from application program command to physical i/o device address of I/O device on device bus

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