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B.24 System I/O Ports
Table B.24: 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 | |
Parallel printer port 2 (LPT3) | |
Serial port 2 | |
Prototype card | |
Reserved | |
Parallel printer port 1 (LPT2) | |
SDLC, bisynchronous 2 | |
Bisynchronous 1 | |
Monochrome display and printer adapter (LPT1) | |
Reserved | |
Color/graphics monitor adapter | |
Diskette controller | |
Serial port 1 |
91 | AppendixB |