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I/O Map
Table 40. I/O Map
Address (hex) Size Description
0000 - 000F 16 bytes DMA controller
0020 - 0021 2 bytes Programmable Interrupt Control (PIC)
0040 - 0043 4 bytes System timer
0060 1 byte Keyboard controller byte—reset IRQ
0061 1 byte System speaker
0064 1 byte Keyboard controller, CMD/STAT byte
0070 - 0071 2 bytes System CMOS/Real Time Clock
0072 - 0073 2 bytes System CMOS
0080 - 008F 16 bytes DMA controller
0092 1 byte Fast A20 and PIC
00A0 - 00A1 2 bytes PIC
00B2 - 00B3 2 bytes APM control
00C0 - 00DF 32 bytes DMA
00F0 1 byte Numeric data processor
0170 - 0177 8 bytes Secondary IDE channel
01F0 - 01F7 8 bytes Primary IDE channel
0228 - 022F (Note 1) 8 bytes LPT3
0278 - 027F (Note 1) 8 bytes LPT2
02E8 - 02EF (Note 1) 8 bytes COM4/video (8514A)
02F8 - 02FF (Note 1) 8 bytes COM2
0376 1 byte Secondary IDE channel command port
0377, bits 6:0 7 bits Secondary IDE channel status port
0378 - 037F 8 bytes LPT1
03B0 - 03BB 12 bytes Intel 82845 MCH
03C0 - 03DF 32 bytes Intel 82845 MCH
03E8 - 03EF 8 bytes COM3
03F0 - 03F5
0370 - 0375
6 bytes
6 bytes
Diskette channel 1
Diskette channel 2
03F6 1 byte Primary IDE channel command port
03F8 - 03FF 8 bytes COM1
04D0 - 04D1 2 bytes Edge/level triggered PIC
LPTn + 400 8 bytes ECP port, LPTn base address + 400h
0CF8 - 0CFB (Note 2) 4 bytes PCI configuration address register
0CF9 (Note 3) 1 byte Turbo and reset control register
0CFC - 0CFF 4 bytes PCI configuration data register
FFA0 - FFA7 8 bytes Primary bus master IDE registers
continued
90 Intel Server Board S845WD1-E Product Guide