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DMA Channels
The system board uses Direct Memory Address (DMA) channels to exchange data without accessing
the CPU. Some channels are assigned for specific use by the system, as defined below. Each DMA
channel appropriates full 32-bit processing. For an ISA bus, channels 0 through 3 are 8-bit and
channels 4 through 7 are 16-bit channels.
DMA
Assignment DMA Assignment
0 Spare 4 Cascade input for 0-3
1 Spare 5 Spare
2 Floppy I/O Controller 6 Spare
3 Parallel Port 7 Spare
Board Layout
PCI Bus 0 = 1 - 3
PCI Bus 1 = 4 - 7
PCI Bus 2 = 8 - 12
1 2 3 4 5 6 7 8 9 10 11 12
PCI
J19 J20
ISA 4 3 2 1
SCSI J26
PCMCIA
J27, J28
Floppy J29
Sideband Connector PCI 1 ConnectorPCI 0 Connector
Speaker J30
J25
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