System
I/O Address |
I/O Address (Hex) |
System Function
(Shipping Configuration) |
000h-00Fh |
Direct
memory access controller |
010h-01Fh |
Unused |
020h-021h |
Programmable
interrupt Controller |
022h-024Fh |
Opti
Chipset Configuration registers |
025h-03F |
Unused |
02E-02F |
87334
Super IO configuration for CPU |
040h-043h |
Counter/Timer
Registers |
044h-05Fh |
Unused |
060h-060h |
Keyboard
Controller |
061h-061h |
Port B |
062h-063h |
Unused |
064h-064h |
Keyboard
Controller |
065h-06Fh |
Unused |
070h-071h |
NMI
Enable/Real Time Clock |
072h-07F |
Unused |
080h-08F |
DMA Page
Registers |
090h-091 |
Unused |
092h-092h |
Port A |
093h-09F |
Unused |
0A0h-0A1h |
Interrupt
controller no. 2 |
0A2h-0BFh |
Unused |
0C0h-0DFh |
DMA
Controller no. 2 |
0E0h-0EFh |
Unused |
0F0h-0F1 |
Coprocessor
Busy Clear/Reset |
0F2h-0FF |
Unused |
100h-16F |
Unused |
170h-177 |
Secondary
Fixed Disk Controller |
178h-1EF |
Unused |
1F0h-1F7 |
Primary Fixed Disk Controller |
1F8h-200 |
Unused |
201h-201 |
Joystick
(Decoded in ESS 1688) |
202h-21F |
Unused |
220h-22F |
Entertainment
Audio |
230h-26D |
Unused |
278h-27F |
Unused |
280h-2AB |
Unused |
2A8h-2E7 |
Unused |
2E8h-2EF |
Reserved
Serial Port |
2F0h-2F7 |
Unused |
2F8h-2FF |
Infrared
Port |
320h-36F |
Unused |
378h-37F |
Parallel
Port (LPT1/Default) |
380h-387 |
Unused |
388h-38B |
FM
Synthesizer - OPL3 |
38Ch-3AF |
Unused |
3B0h-3BB |
VGA |
3BCh-3BF |
Reserved
(Parallel Port/No EPP Support) |
3C0h-3DF |
VGA |
3E0h-3E1 |
PC Card
Controller in CPU |
3E8h-3EF |
Internal
Modem |
3F0h-3F7 |
"A"
Diskette Controller |
3F8h-3FF |
Serial
Port (COM1/Default) |
CF8h-CFB |
PCI
Configuration Index Register (PCIDIVO-1) |
CFCh-CFF |
PCI
Configuration Index Register (PCIDIVO-1) |