1-12 Technical Information
Table 1-4 I/O Address Map*
Address (Hex)
I/O Device Name
0000-000F
PIIX4 - DMA controller 1 (channel 0-3)
0020-0021
PIIX4 - Interrupt controller 1
002E-002F
Super I/O controller configuration registers
0040-0043
PIIX4 - Timer 1
0048-004B
PIIX4 - Timer 2
0060
Keyboard controller byte - Reset IRQ
0061
PIIX4 - NMI, speaker control
0064
Keyboard controller, command/status byte
0070, bit 7
PIIX4 - Enable NMI
0070, bits 6 through 0 PIIX4 - Real time clock, address
0071
PIIX4 - Real time clock, data
0078
Reserved - board configuration
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
Management extension hardware
02E8-02EF
COM4/Video (8514A)
02F8-02FF
COM2
0300-0301
MPU-401 (MIDI)
0330-0331
MPU-401(MIDI)
alternate
0332-0333
MPU-401 (MIDI)
alternate
0334-0335
MPU-401 (MIDI)
alternate
* In Plug and Play systems, these addresses are typical but may vary by configuration.
** Only accessible by DWORD accesses.
*** Byte access only.