Appendix E
I/O Port Address Map
Address ( HEX )
Device
000-01F
DMA controller 1
020-021
Interrupt controller 1
022-023
M1487/M1489 chipset address
040-05F
Timer 1 & 2
043
Disable Watch-dog timer operation (read)
060-06F
Keyboard controller
070-071
Real Time Clock, Non_Maskable interrupt
080-09F
DMA page register
0A0-0A1
Interrupt controller 2
0C0-0DF
DMA controller 2
0F0
Clear math. Coprocessor busy signal
0F1
Reset math. Coprocessor
0F8-0FF
Math. Coprocessor
1F0-1F8
Fixed disk controller
200-207
Game port
278-27F
Parallel port #2
2E8-2EF
Serial port #4 (COM 4)
2F8-2FF
Serial port #2 (COM 2)
300-31F
Prototype card / Streaming Tape Adapter
378-37F
Parallel port #1
380-38F
SDLC, Bisynchronous 2
3A0-3AF
SDLC, Bisynchronous 1
3B0-3BF
Monochrome Display , Parallel port 0
3C0-3CF
EGA card
3D0-3DF
CGA card
3E8-3EF
Serial port #3 (COM3)
3F0-3F7
Floppy Disk controller
3F8-3FF
Serial port #1 (COM1)
443
Enable Watch-dog timer operation (read)
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