ASCII Codes • Harware Interrupts • Serial Ports
| NMI | Non-Maskable Interrupt (Parity) |
| Interrupt Controller 1 | |
| IRQ0 | Timer Output |
| IRQ1 | Keyboard |
| IRQ2 |
XT - Reserved AT - Route to interrupt controller 2, IRQ8 to IRQ15 |
| IRQ3 | Serial port comm 2 or SDLC |
| IRQ4 | Serial port comm 1 or SDLC |
| IRQ5 |
XT - Hard disk controller AT - Parallel port printer LPT2 |
| IRQ6 | Floppy disk controller |
| IRQ7 | Parallel port printer LPT1 |
| Interrupt Controller 2 | |
| IRQ8 | Real time clock |
| IRQ9 | Software redirect to IRQ2 (Int 0A hex) |
| IRQ10 | Reserved |
| IRQ11 | Reserved |
| IRQ12 | Reserved |
| IRQ13 | 80287 Math Coprocessor |
| IRQ14 | Hard disk controller |
| IRQ15 | Some hard drives or SCSI controllers |