ADDRESS/INTERRUPT TABLES
Table A-2. Commonly Used PC Interrupts
IRQ | Interrupt Usage | Machine Type |
IRQ2 | Reserved | PC |
IRQ2 | Cascade from slave 8259A PIC | AT, PS/2 |
IRQ3 | Serial communications (COM2) | PC, AT, PS/2 |
IRQ4 | Serial communications (COM1) | PC, AT, PS/2 |
IRQ5 | Fixed disk | PC |
IRQ5 | Parallel printer (LPT2) | AT |
IRQ6 | Floppy disk | PC, AT, PS/2 |
IRQ7 | Parallel printer (LPT1) | PC, AT, PS/2 |
IRQ9 | Software diverted to IRQ2 | AT, PS/2 |
IRQ10 | Reserved | AT, PS/2 |
IRQ11 | Reserved | AT, PS/2 |
IRQ12 | Reserved | AT |
IRQ12 | Mouse | PS/2 |
IRQ14 | AT, PS/2 | |
IRQ15 | Reserved | AT, PS/2 |
