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Maintenance and Service Guide 6–9
Table 6-7
System I/O Addresses
I/O Address (hex) System Function (shipping configuration)
000 - 00F DMA controller no. 1
010 - 01F Unused
020 - 021 Interrupt controller no. 1
022 - 024 Opti chipset configuration registers
025 - 03F Unused
02E - 02F 87334 “Super I/O” configuration for CPU
040 - 05F Counter/timer registers
044 - 05F Unused
060 Keyboard controller
061 Port B
062 - 063 Unused
064 Keyboard controller
065 - 06F Unused
070 - 071 NMI enable/RTC
072 - 07F Unused
080 - 08F DMA page registers
090 - 091 Unused
092 Port A
093 - 09F Unused
0A0 - 0A1 Interrupt controller no. 2