Dma Channel Assignments; Table 1-4. Dreq Line Assignments - Dell Precision 400 Service Manual

1-18 Dell WorkStation 400 Systems Service Manual
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MA Channel Assignments

Table 1-4. DREQ Line Assignments

DREQ Line Used By/Available
DREQ0 Available
DREQ1 Available
DREQ2 Generated by super I/O controller to initiate DMA cycle for
attached diskette drive
DREQ3 Available
DREQ4 Generated by bus controller chip to activate second DMA
controller
DREQ5 Available
DREQ6 Available
DREQ7 Available
NOTE: The integrated audio controller is assigned one or two DMA channels automatically
during system start-up.