6-12 Specifications
6.11 System I/O Addresses
Table 6-15
System I/O Addresses
I/O Address (Hex) System Function (Shipping Configuration)
000 - 00F Master DMA controller # 1
010 - 011 Force software SMI
012 - 01F Unused
020 - 021 Peripheral interrupt controller # 1
022 - 024 Opti chipset configuration registers
025 - 03F Unused
040 - 043 Counter/timer registers
044 - 05F Unused
060 Keyboard data
061 Port B
062 - 063 Unused
064 Keyboard command/status
065 - 06F Unused
070 CMOS index address
071 CMOS data
072 - 073 Unused
074 Reserved
075 Unused
076 Reserved
077 - 077F Unused
080 - 08F DMA page registers
084 - 085 POST code output port
090 - 091 Unused
092 Fast reset register
093 - 09F Unused
0A0 - 0A1 Interrupt controller # 2
0A2 - 0BF Unused
0C0 - 0DF DMA controller # 2
0E0 - 0E1 ESS audio configuration
0E2 - 0E5 Configuration registers
0E6 - 0EF Unused
0F0 - 0F1 NCP numerics register
0F9 ESS configuration lock
0FA Unused
0FB ESS configuration unlock
0FC - 0FF Unused
100 - 101 Unused
103 - 16F Unused
Continued
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