I/O addresses, interrupts and DMA channels
System
specifications
I/O addresses, interrupts and DMA channels
Function I/O
address
Interrupt
DMA
DMA controller #1, 8237
000H – 01FH
Interrupt controller #1, 8259
020H – 030H
Timer, 8254
040H – 050H
IRQ0
DRQ0
Keyboard and mouse controller 060H – 06FH
IRQ1, IRQ12
Real-time clock/NMI controller
070H – 07FH
IRQ8
DMA register
080H – 09FH
Fast A20 gate and CPU reset
092H
Interrupt controller #2, 8259
0A0H – 0BFH
DMA controller #2, 8237
0C0H – 0DFH
Clear FPU
0F0H
Reset FPU
0F1H
ACC2066 register
0F2H – 0F3H
FPU
0F8H, 0FCH, 0FEH
Hard disk controller
1F0H – 1F8H
IRQ14
Soundchip ESS688
220H – 22FH
IRQ5
DRQ1
388H – 38BH
Parallel port LPT2
278H – 27FH
IRQ5
Serial port COM2
2F8H – 2FFH
IRQ3
Parallel port LPT1
378H – 37FH
IRQ7
Display controller
3B0H – 3DFH
PCMCIA controller
3E0H – 3E3H
Floppy disk controller
3F0H – 3F7H
IRQ6
DRQ2
Serial port COM1
3F8H – 3FFH
IRQ4
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