Appendix D System Assignments 85
D.2 DMA Channel Assignments
Table D-2: DMA channel assignments
Channel Function
0 Available
1 Available
2 Floppy disk (8-bit transfer)
3 Available
4 Cascade for DMA controller 1
5 Available
6 Available
7 Available
* Audio DMA select 0, 1 or 3
D.3 Interrupt Assignments
Table D-3: Interrupt assignments
Interrupt# Interrupt source
IRQ 0 Interval timer
IRQ 1 Keyboard
IRQ 2 Interrupt from controller 2 (cascade)
IRQ 8 Real-time clock
IRQ 9 Cascaded to INT 0A (IRQ 2)
IRQ 10 Available
IRQ 11 Watchdog Timer
IRQ 12 PS/2 mouse (non-releasable)
IRQ 13 INT from co-processor
IRQ 14 Fixed disk controller (Primary)
IRQ 15 Fixed disk controller (Secondary)
IRQ 3 Serial communication port 2
IRQ 4 Serial communication port 1
IRQ 5 Parallel port 2
IRQ 6 Diskette controller (FDC)
IRQ 7 Parallel port 1 (print port)
* PNP audio IRQ select: 5, 7, 9 or 10
* Ethernet function is auto-sensing
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