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Maintenance and Service Guide 6–27
Table 6-24
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/real time clock (RTC)
072—07F Unused
080—08F DMA page registers
090—091 Unused
092 Port A
093—09F Unused
0A0—0A1 Interrupt controller no. 2