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AST RESEARCH TECHNICAL BULLETIN TB-0030 7-17-84
DMA CHANNEL ASSIGNMENT IN THE IBM PC AND XT
When interfacing products to the IBM PC or XT, which use Direct
Memory Access (DMA), it is necessary to insure that there is not
a conflict with a device using the same channel.
The following table shows the channels and their assignments.
ADD-ON
CHANNEL IBM ASSIGNMENT ASSIGNMENT
DMA 0 IBM MEMORY REFRESH NONE
DMA 1 IBM - SDLC AST-PCOX - STD
AST-PCNET
DMA 2 IBM - FLOPPY DISK NONE
DMA 3 IBM - HARD DISK AST-PCOX (Alt.)
OTHER HARD DISK