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System I/O address specifications<br />
I/O address (hex)<br />
System function (shipping configuration)<br />
000 - 00F DMA controller no. 1<br />
010 - 01F Unused<br />
020 - 021 Interrupt controller no. 1<br />
022 - 024 Opti chipset configuration registers<br />
025 - 03F Unused<br />
02E - 02F<br />
87334 “Super I/O” configuration for CPU<br />
040 - 05F Counter/timer registers<br />
044 - 05F Unused<br />
060 Keyboard controller<br />
061 Port B<br />
062 - 063 Unused<br />
064 Keyboard controller<br />
065 - 06F Unused<br />
070 - 071 NMI enable/RTC<br />
072 - 07F Unused<br />
080 - 08F DMA page registers<br />
090 - 091 Unused<br />
092 Port A<br />
093 - 09F Unused<br />
0A0 - 0A1 Interrupt controller no. 2<br />
I/O Address (hex)<br />
0A2 - 0BF<br />
System Function (shipping configuration)<br />
Unused<br />
0C0 - 0DF DMA controller no. 2<br />
0E0 - 0EF<br />
0F0 - 0F1<br />
0F2 - 0FF<br />
Unused<br />
Coprocessor busy clear/reset<br />
Unused<br />
100 - 16F Unused<br />
170 - 177 Secondary fixed disk controller<br />
178 - 1EF Unused<br />
1F0 - 1F7<br />
1F8 - 200<br />
Primary fixed disk controller<br />
Unused<br />
201 Joystick (decoded in ESS1688)<br />
112 Chapter 6 Specifications
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