0330-0331 | MPU-401 |
0376 | IDE Controller |
0378-037A | LPT1 (XT parallel port 2) |
0388-038B | Frequency modulation (FM) synthesis |
03B0-03BB | MDA, EGA/video graphics array (VGA) |
03BC-03BE | LPT 3 (XT parallel port 1) |
03C0-03DF | EGA/VGA |
03E0-03E7 | PCIC PCMCIA controllers |
03E8-03EF | Alternate COM (3) |
03F0-03F7 | FDC |
03F8-03FF | COM1 |
0534-0537 | Windows Sound System-compatible |
0CF8-0CFB | Peripheral Component Interconnect (PCI) ports |
Table B.2 Legacy hardware IRQ assignment (PC 99)
| Hardware IRQ | Default assignment |
|---|---|
| IRQ 0 | System timer |
| IRQ 1 | Keyboard |
| IRQ 2 | Second programmable interrupt controller (PIC) cascade |
| IRQ 3 | COM2 |
| IRQ 4 | COM1 |
| IRQ 5 | Sometimes LPT 2 — not considered fixed |
| IRQ 6 | Standard floppy disk controller (FDC) |
| IRQ 7 | LPT1 |
| IRQ 8 | Real-time clock/CMOS |
| IRQ 9 | — |
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