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Reference Guide 133
DMA Channels
0 Sound Record* (unmarked models*)
Free (“900 B” models)
1 Sound playback
2 Floppy drive
3 LPT1 (ECP parallel port)
4 Cascade
5 Free
6 Free
7 Free
* Unmarked models have no “900” after the serial number, “900 B” models have
“900 B” after the serial number.