dmaports.txt

汇编源代码大全

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From : Inbar Raz

Port  Description
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000H-01fH DMA (Direct Memory Access) controller        See DMA Ports

020H-03fH Interrupt Controller

==============================================================================

 DMA (Direct Memory Access) is used for high-speed data transfers between I/O
 devices and memory without intervention of the CPU.  It is typically employed
 by diskette and hard disk drivers, but it could be used for streaming tape or
 any other device as long as it does not interfere with the operation of other
 standard devices.

 The original PC supports four 8-bit DMA channels, across a 20-bit address
 space, using an Intel 8237A DMA controller chip.  The 軦T