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Appendix B Pin Assignments 85
B.10 DMA Channel Assignments
Table B-10: DMA channel assignments
Channel Function
0 Available
1 Available
2 Floppy disk (8-bit transfer)
3 LPT1
4 Cascade for DMA controller 1
5 Available
6 Available
7 Available
B.11 Interrupt Assignments
Table B-11: 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 Available
IRQ 12 PS/2 mouse
IRQ 13 INT from co-processor
IRQ 14 Fixed disk controller
IRQ 15 Available
IRQ 3 Serial communication port 2
IRQ 4 Serial communication port 1
IRQ 5 Available
IRQ 6 Diskette controller (FDC)
IRQ 7 Parallel port 1 (print port)