B.16 System I/O Ports
Table B.16: System I/O Ports
Addr. range (Hex) | Device |
|
|
DMA controller | |
Interrupt controller 1, master | |
Chipset address | |
8254 timer | |
8042 (keyboard controller) | |
| mask |
DMA page register | |
Interrupt controller 2 | |
DMA controller | |
0F0 | Clear math |
0F1 | Reset math |
Math | |
Fixed disk | |
Game I/O | |
Serial port 2 | |
Prototype card | |
Reserved | |
SDLCm bisynchronous 2 | |
Bisynchronous 1 | |
Reserved | |
Color/graphics monitor adapter | |
Diskette controller | |
Serial port 1 | |
Serial port3 | |
Serial port4 | |
Serial port5 | |
Serial port6 |
B.17 DMA Channel Assignments
Table B.17: DMA Channel Assignments
Channel | Function |
0 | Available |
1 | Available |
2 | Floppy disk |
3 | Available |
4 | Cascade for DMA controller 1 |
5 | Available |
6 | Available |
7 | Available |
Appendix B Pin Assignments
73 |