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Dell OptiPlex Gn and Gn+ 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
NOTES: The optional built-in NIC and built-in video controller are assigned available DMA
channels automatically during system start-up.
If the parallel port is in ECP mode, it uses one of the available DREQ lines.
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