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4.1 I/O Port Address Map
Each peripheral device in the system is assigned a set of I/O port addresses
which also becomes the identity of the device.
The following table lists the I/O port addresses used.
Address
000h - 01Fh
020h - 03Fh
040h - 05Fh
060h - 06Fh
070h - 07Fh
080h - 09Fh
0A0h - 0BFh
0C0h - 0DFh
0F0h
0F1h
1F0h - 1F7h
278h - 27Fh
2F8h - 2FFh
2B0h - 2DFh
378h - 3FFh
360h - 36Fh
3B0h - 3BFh
3C0h - 3CFh
3D0h - 3DFh
3F0h - 3F7h
3F8h - 3FFh
Device Description
DMA Controller #1
Interrupt Controller #1
Timer
Keyboard Controller
Real Time Clock, NMI
DMA Page Register
Interrupt Controller #2
DMA Controller #2
Clear Math Coprocessor Busy Signal
Reset Math Coprocessor
IDE Interface
Parallel Port #2 (LPT2)
Serial Port #2 (COM2)
Graphics adapter Controller
Parallel Port #1 (LPT1)
Network Ports
Monochrome & Printer adapter
EGA adapter
CGA adapter
Floppy Disk Controller
Serial Port #1 (COM1)
Appendix
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