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SE440BX Motherboard Product Guide
55
I/O Map
Table 35. I/O Map
Address (hex) Size Description
0000 - 000F 16 bytes DMA controller 1
0020 - 0021 2 bytes Interrupt controller 1
002E - 002F 2 bytes Super I/O controller configuration registers
0040 - 0043 4 bytes Counter/Timer 1
0048 - 004B 4 bytes Counter/Timer 2
0060 1 byte Keyboard controller
0061 1 byte NMI, speaker control
0064 1 byte Keyboard controller
0070 - 0071 2 bytes Real time clock controller
0080 - 008F 16 bytes DMA page registers
00A0 - 00A1 2 bytes Interrupt controller 2
00B2 - 00B3 2 bytes APM control
00C0 - 00DE 31 bytes DMA controller 2
00F0 - 00FF 16 bytes Numeric processor
0170 - 0177 8 bytes Secondary IDE controller
01F0 - 01F7 8 bytes Primary IDE controller
0200 - 0207 8 bytes Audio / game port / joy stick
0220 - 022F 16 bytes Audio (Sound Blaster compatible)
0228 - 022F 8 bytes LPT3
0278 - 027F 8 bytes LPT2
02E8 - 02EF 8 bytes COM4/Video (8514A)
02F8 - 02FF 8 bytes COM2
0330 - 0331 2 bytes MPU-401 (MIDI)
0376 - 0377 2 bytes Secondary IDE controller
0120 - 0127 8 bytes Audio controller
0274 - 0277 4 bytes I/O read data port for ISA Plug and Play enumerator
0378 - 037F 8 bytes LPT1
0388 - 038D 6 bytes AdLib
†
(FM synthesizer)
03B0 - 03BB 12 bytes Video (monochrome)
03C0 - 03DF 32 bytes Video (VGA
†
)
03E8 - 03EF 8 bytes COM3
03F0 - 03F5, 03F7 7 bytes Diskette controller
03F6 1 byte Primary IDE controller
03F8 - 03FF 8 bytes COM1
04D0 - 04D1 2 bytes Edge/level triggered PIC
0530 - 0537 8 bytes Windows Sound System
LPT
n
+ 400h 8 bytes ECP port, LPT
n
base address + 400h
0CF8 - 0CFF* 8 bytes PCI configuration registers
0CF9** 1 byte Turbo and reset control register
* DWORD access only
** Byte access only