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Maintenance and Service Guide 6–13
Table 6-12
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 IO” 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/real time clock
072–07F Unused
080–08F DMA page registers
090–091 Unused
092 Port A
093–09F Unused
0A0–0A1 Interrupt controller no. 2