Appendix A: Technical Specifications
Address (hex)
Description
00C0-00DE
DMA 2
00F0
Coprocessor Error
0170 _ 0177
Secondary IDE channel
01F0 _ 01F7
Primary IDE channel
0278-027F
LPT2 (if selected)
02E8-02EF COM4
(default)
02F8-02FF
COM2 (default)
0376
Secondary IDE channel command port
0377
Floppy channel 2 command
0377, bit 7
Floppy disk change, channel 2
0377, bits 6:0
Secondary IDE channel status port
0378-037F
LPT1 (default)
03B4-03B5
Video (VGA)
03BA
Video (VGA)
03BC-03CD
LPT3 (if selected)
03C0-03CA
Video (VGA)
03CC
Video (VGA)
03CE-03CF
Video (VGA)
03D4-03D5
Video (VGA)
03DA
Video (VGA)
03E8-03EF
COM3 (default)
03F0-03F5
Floppy Channel 1
03F6
Primary IDE channel command port
03F7
Floppy Channel 1 command
03F7, bit 7
Floppy disk change channel 1
03F7, bits 6:0
Primary IDE channel status report
03F8-03FF
COM1 (default)
0CF8-0CFB - 4 bytes
PCI configuration address register
0CF9
Reset control register
0CFC-0CFF - 4 bytes
PCI configuration data register
Interrupts
IRQ
System Resource
NMI
I/O channel check
0
Reserved, interval timer
1
Reserved (keyboard)
2
Reserved (cascade)
3
COM2*
4
COM1*
5
User Available for PCI
6
Floppy Drive
7
LPT1*
8
Real time clock
9
User Available for PCI
10
User Available for PCI
11
User Available for PCI
12
PS/2 mouse port
13
Reserved (math coprocessor)
14
Primary IDE
15
Secondary IDE
*Default, but can be changed to another IRQ
41
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Summary of Contents for MicroATX Express
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