Curtis AR-B1682 - Manual (Page 57)

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B-3. TIMER & DMA CHANNELS MAP
Timer Channel Map :
Timer Channel Assignment
0 System timer interrupt
1 DRAM Refresh request
2 Speaker tone generator
DMA Channel Map :
DMA Channel Assignment
0 Available
1 IBM SDLC
2 Floppy Disk adapter
3 Channel-3 Available
4 Cascade for DMA controller 1
5 Available
6 Available
7 Available