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Address range (hex) Size (bytes) Description
0073 1 RTC data
0080 1 POST checkpoint register during POST only
008F 1 Refresh page register
0080 – 008F 16 DMA page registers
0090 – 0091 15 General I/O locations, available to PCI bus
0092 1 PS/2 keyboard controller registers
0093 – 009F 15 General I/O locations
00A0 – 00A1 2 Interrupt controller 2
00A2 – 00BF 30 APM control
00C0 – 00DF 31 DMA 2
00E0 – 00EF 16 General I/O locations, available to PCI bus
00F0 1 Coprocessor error register
00F1 – 016F 127 General I/O locations, available to PCI bus
0170 – 0177 8 Secondary IDE channel
01F0 – 01F7 8 Primary IDE channel
0200 – 0207 8 MIDI/joystick port
0220 – 0227 8 Serial port 3 or 4
0228 – 0277 80 General I/O locations, available to PCI bus
0278 – 027F 8 LPT3
0280 – 02E7 102 Available
02E8 – 02EF 8 Serial port 3 or 4
02F8 – 02FF 8 COM2
0338 – 033F 8 Serial port 3 or 4
0340 – 036F 48 Available
0370 – 0371 2 IDE channel 1 command
0378 – 037F 8 LPT2
0380 – 03B3 52 Available
03B4 – 03B7 4 Video
03BA 1 Video
03BC – 03BE 16 LPT1
03C0 – 03CF 52 Video
03D4 – 03D7 16 Video
03DA 1 Video
03D0 – 03DF 11 Available
03E0 – 03E7 8 Available
03E8 – 03EF 8 COM3 or COM4
03F0 – 03F5 6 Diskette channel 1
03F6 1 Primary IDE channel command port
03F7 (Write) 1 Diskette channel 1 command
03F7, bit 7 1 bit Diskette disk change channel
03F7, bits 6:0 7 bits Primary IDE channel status port
38 User Guide