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Hardware Specifications and Configurations 1-41
System IO Address Map
I/O address (hex) System function (shipping configuration)
000 - 00F DMA controller no. 1
010 - 01F Unused
020 - 021 Interrupt controller no. 1
022 - 03F Unused
040 - 043 Counter/timer registers
060 Keyboard controller
061 Speaker controller
062 - 063 Unused
064 Keyboard controller
065 - 06F Unused
070 - 071 CMOS/RTC
072 - 073 Alternate RTC address port / data port
074 - 080 Unused
081 - 08F DMA page registers
090 - 091 Unused
092 FAST INIT register
093 - 09F Unused
0A0 - 0A1 Interrupt controller no. 2
0A2 - 0BF Unused
0C0 - 0DF DMA controller no. 2
0E0 - 0EF Unused
0F0 - 0FF Numeric data processor
100 - 3AF Unused
3B0 - 3BB VGA
3BC - 3BF Unused
3C0 - 3DF VGA
3E0 - 40A Unused
40B DMA1 Extend
40C - 4CF Unused
4D0 Interrupt edge control
4D1 - 4D5 Unused