ErgoPro e-, x- and s- Series PC Specialist's Handbook
Page 86 First Edition, Release 4 - June 1998
Channels, addresses and timer counters
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 On-board audio (x251/451/651 and s-series)
1
Aztech audio (xs-series)
CH 1 On-board audio (x251/451/651 and s-series)
2
Aztech audio (xs-series)
CH 2 Diskette drive controller
CH 3 On-board audio (x251/451/651 and s-series)
2
CH 4 Cascading slave to master
CH 5
CH 6
CH 7
1
: When enabled
2
: Alternative selection
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