System Resources
DMA Channel Assignments
Part III: Appendixes
352
DMA Channel Assignments
Direct Memory Access (DMA) allows some devices to transfer
data to and from memory at high speeds, without using the CPU.
Such devices are each assigned a unique DMA channel. The com-
puter has two DMA controllers with four channels on each con-
troller, a total of eight DMA channels.
The following table lists the computer’s DMA channel
assignments.
7 LPT1 Choice for ECP or PC Card
8 Real-time clock
9 Software redirect to INT 0Ah Choice for ECP or PC Card
10 Reserved Choice for ECP or PC Card
11 Reserved Choice for ECP or PC Card
12 PS/2 Mouse/AccuPoint or PC
Card
13 Numeric Data Processor
14 Hard disk, ECP, or PC Card
15 ECP or PC Card
DMA Use Notes
0 Reserved
1 Reserved ECP
2 3 1/2” diskette drive, or ECP
3 Reserved ECP
4 Cascade from DMAC 1
5 Reserved
6 Reserved
7 Reserved
IRQ Use Notes
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