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System Board 4-19
I/O Address Map
Address (Hex) I/O Device Name
0070, bit 7 PIIX4 - enable NMI
0070, bits 6 through 0 PIIX4 - real time clock, address
0071 PIIX4 - real time clock, data
0078-0079 Reserved - board configuration
0080-008F PIIX4 - DMA page registers
00A0-00A1 PIIX4 - interrupt controller 2
00B2-00B3 APM control
00C0-00DE PIIX4 - DMA controller 2
00F0 Reset numeric error (numeric data processor)
0170-0177 Secondary IDE channel
01F0-01F7 Primary IDE channel
0200-0207 Audio/game port
0220-022F Audio (Sound Blaster compatible)
0240-024F Audio (Sound Blaster compatible)/alternate
0278-027F Parallel port 2
0290-0297 Hardware monitor
02E8-02EF COM4/video (8514A)
02F8-02FF COM2
0300-0301 MPU-401 (MIDI)/alternate
0330-0331 MPU-401 (MIDI)/alternate
0332-0333 MPU-401 (MIDI)/alternate
0334-0335 MPU-401 (MIDI)/alternate
0376 Secondary IDE channel command port
0377 Floppy channel 2 command
0377, bit 7 Floppy disk change, channel 2
0377, bits 6 through 0 Secondary IDE channel status port
0378-037F Parallel port 1
0388-038D AdLIB (FM synthesizer)
03B4-03B5 Video (VGA)
03BA Video (VGA)
03BC-03BF Parallel port 3
03C0-03CA Video (VGA)
03CC Video (VGA)