Dell OptiPlex Gn - DMA Channel Assignments; Table 1-4. DREQ Line Assignments

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Dell OptiPlex Gn and Gn+ Systems Service Manual
D
MA Channel Assi
g
nments
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.