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6-20 Specifications
6.11 System I/O Address
Table 6-20
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