ErgoPro m664 PC Specialist's Handbook
Page 9-8 Edition 1 - Release 1 - March 1998
DMA channels
The system board supports seven ISA-compatible DMA channels by utilising two DMA controller chips which
operate in cascade mode as a master-slave pair. The slave uses channels 0 to 3, supporting 8-bit data transfers
while the master controller uses channels 4 to 7, supporting 16-bit data transfers. Controllers are 8237A
compatible.
The following table lists each DMA channel and its use.
16-bit channels 8-bit channels Use(s)
Master Slave
(CTRL1) (CTRL2)
CH 0
CH 1 Optional Creative Audio (PnP ISA)
CH 2 Floppy drive controller
CH 3 Optional Creative Audio (PnP ISA)
Parallel Port (for ECP)
CH 4 Cascading slave to master
CH 5
CH 6
CH 7
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