Bridgeboard Hardware interrupts
A2088XT /A1060 (Sidecar)
| IRQ | Usage |
|---|---|
| 0 | RAM REFRESH & CLOCK TICK |
| 1 | KEYBOARD INTERFACE |
| 2 | VIDEO |
| 3 | ServiceIRQ handles shared DOS/BIOS functions on PC |
| 4 | COM1 (also COM3) |
| 5 | HARD DISK |
| 6 | FLOPPY DISK |
| 7 | PARALLEL PRINTER PORT LPT 1 |
A2286AT / A2386AT
| IRQ | Usage |
|---|---|
| 0 | System timer |
| 1 | Keyboard Interface |
| 2 | Video |
| 3 | ServiceIRQ handles shared DOS/BIOS functions on PC |
| 4 | Serial Port COM1 (may also be COM3) |
| 5 | Parallel Port LPT2 |
| 6 | Floppy Disk Drive Interface (If on-board floppy access is enabled.) |
| 7 | Parallel Port LPT1 (note 2) |
| 8 | Real Time Clock (RTC) |
| 9 | Available |
| 10 | Available |
| 11 | Available |
| 12 | Available |
| 13 | Coprocessor |
| 14 | Primary IDE/ATA adaptor |
| 15 | Secondary IDE/ATA adaptor |
Last Update: 06.08.2023