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73 AIMB-258 User Manual
Appendix B Pin Assignments
B.16 System I/O Ports
B.17 DMA Channel Assignments
Table B.16: System I/O Ports
Addr. range (Hex) Device
000-01F DMA controller
020-021 Interrupt controller 1, master
022-023 Chipset address
040-05F 8254 timer
060-06F 8042 (keyboard controller)
070-07F Real-time clock, non-maskable interrupt (NMI)
mask
080-09F DMA page register
0A0-0BF Interrupt controller 2
0C0-0DF DMA controller
0F0 Clear math co-processor
0F1 Reset math co-processor
0F8-0FF Math co-processor
1F0-1F8 Fixed disk
200-207 Game I/O
290-29F On-board hardware monitor
2F8-2FF Serial port 2
300-31F Prototype card
360-36F Reserved
380-38F SDLCm bisynchronous 2
3A0-3AF Bisynchronous 1
3C0-3CF Reserved
3D0-3DF Color/graphics monitor adapter
3F0-3F7 Diskette controller
3F8-3FF Serial port 1
3E8-3EF Serial port3
2E8-2EF Serial port4
4F8-4FF Serial port5
4E8-4EF Serial port6
Table B.17: 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