Dell OptiPlex Gxi - Manual (Page 24)

DMA Channel Assignments: OptiPlex GXi
NOTE: The integrated audio, NIC, and video controllers are assigned available DMA channels automatically during system start-up.
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