CP/486DX2 HARDWARE INTERRUPTS AND DMA CHANNELS
| CP/486DX2 Hardware Interrupts - General | ||||
|---|---|---|---|---|
| Int.Name | PC/104 | Int.# | CP/486DX2 Usage | PC/AT Standard |
| NMI | NO | 02h | Unused | Parity Error |
| IRQ0 | NO | 08h | System Timer | System Timer |
| IRQ1 | NO | 09h | Keyboard Controller | Keyboard Controller |
| IRQ2 | NO | 0Ah | Cascade for IRQ8 - 15 | Cascade for IRQ8 - 15 |
| IRQ3 | YES | 0Bh | Serial Port | Serial Port |
| IRQ4 | YES | 0Ch | Serial Port | Serial Port |
| IRQ5 | YES | 0Dh | Unassigned | Parallel Port |
| IRQ6 | YES | 0Eh | Floppy Disk Controller | Floppy Disk Controller |
| IRQ7 | YES | 0Fh | Parallel Port | Parallel Port |
| IRQ8 | NO | 70h | Real Time Clock | Real Time Clock |
| IRQ9 | YES | 71h | Redirected to IRQ2 | Redirected to IRQ2 |
| IRQ10 | YES | 72h | Unassigned | Unassigned |
| IRQ11 | YES | 73h | Unassigned | Unassigned |
| IRQ12 | YES | 74h | Unassigned | Mouse |
| IRQ13 | NO | 75h | Math Coprocessor | Math Coprocessor |
| IRQ14 | NO | 76h | Hard Disk Controller | Hard Disk Controller |
| IRQ15 | YES | 77h | Unassigned | Unassigned |
| CP/486DX2 Interrupt Assignment with Standard BIOS Setup | |||
|---|---|---|---|
| Int.Name | PC/104 | Int.# | CP/486DX2 Usage |
| IRQ0 | NO | 08h | System Timer |
| IRQ1 | NO | 09h | Keyboard Controller |
| IRQ2 | NO | 0Ah | Cascade for IRQ8 - 15 |
| IRQ3 | YES | 0Bh | Serial Port COM2 |
| IRQ4 | YES | 0Ch | Serial Port COM1 |
| IRQ5 | YES | 0Dh | On-board LAN |
| IRQ6 | YES | 0Eh | Floppy Disk Controller or unassigned (Note 1) |
| IRQ7 | YES | 0Fh | Parallel Port LPT1 |
| IRQ8 | NO | 70h | Real Time Clock |
| IRQ9 | YES | 71h | Redirected to IRQ2 |
| IRQ10 | YES | 72h | Unassigned |
| IRQ11 | YES | 73h | Unassigned |
| IRQ12 | YES | 74h | Unassigned |
| IRQ13 | NO | 75h | Math Coprocessor |
| IRQ14 | NO | 76h | Hard Disk Controller or unassigned (Note 2) |
| IRQ15 | YES | 77h | Unassigned |
Note 1: The CP/486DX2 Floppy Controller can be assigned to the Interrupt IRQ6 if the Floppy Controller is enabled in the CP/486DX2 BIOS Setup. IRQ6 is unassigned and free for using over the PC/104 bus, if the Floppy Controller is disabled in the CP/486DX2 BIOS Setup.
Note 2: The CP/486DX2 Hard Disk Controller can be assigned to the Interrupt IRQ14 if the Hard Disk Controller is enabled in the CP/486DX2 BIOS Setup. IRQ14 is unassigned and free for using over the PC/104 bus, if the Hard Disk Controller is disabled in the CP/486DX2 BIOS Setup.