Dma Channels; Board Layout - Intergraph InterServe 8000 System Reference Manual

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
0 Spare
1 Spare
2 Floppy I/O Controller
3 Parallel Port

Board Layout

J19 J20
ISA
SCSI J26
Floppy J29
Jumper Connectors
Connector
J19
J20
J25
1
PCI
4 3 2 1
J25
PCMCIA
J27, J28
Speaker J30
PCI 0 Connector Sideband Connector
Jumper Result
On Clears Real Time Clock and CMOS data
Off Default
On Clears the BIOS Password
Off Default
On Disables VGA display mode
Off Enables VGA display mode (default)
DMA Assignment
4 Cascade input for 0-3
5 Spare
6 Spare
7 Spare
2 3 4 5 6
PCI Bus 0 = 1 - 3
PCI Bus 1 = 4 - 7
PCI Bus 2 = 8 - 12
PCI 1 Connector
7 8 9 10 11 12
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