Dell Precision 400 Service Manual (.pdf) - Page 30
DMA Channel Assignments, Table 1-4., DREQ Line Assignments
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DMA 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. 1-18 Dell WorkStation 400 Systems Service Manual
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1-18
Dell WorkStation 400 Systems Service Manual
D
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.