Chapter 3 Hardware Description
3.10 Interrupt Request Lines (IRQ)
There are a total of 15 IRQ lines available on the motherboard. Peripheral devices use interrupt request lines to notify the CPU for the service required. The following table shows the IRQ used by the devices on the motherboard.
| Level |
|
| Function |
|
| IRQ0 |
| System Timer Output |
| |
| IRQ1 |
|
| Keyboard |
|
| IRQ2 |
| Interrupt Cascade |
| |
| IRQ3 |
| Serial Port #2 |
| |
| IRQ4 |
| Serial Port #1 |
| |
| IRQ5 |
| Parallel Port #2 |
| |
| IRQ6 |
|
| Floppy Disk Controller |
|
| IRQ7 |
| Parallel Port #1 |
| |
| IRQ8 |
| Real Time Clock |
| |
| IRQ9 |
| Software Redirected to Int 0Ah |
| |
| IRQ10 |
|
| Reserved |
|
| IRQ11 |
|
| Reserved |
|
| IRQ12 |
|
| Reserved |
|
| IRQ13 |
| 80287 |
| |
| IRQ14 |
| Primary IDE |
| |
| IRQ15 |
| Secondary IDE |
| |
3.11 Accelerated Graphics Port (AGP) Slot
The AI5VG motherboard comes with an AGP slot for an AGP VGA card that supports 133MHz 2X mode for AD and SBA signaling to provide
AI5VG Pentium VP3 Baby AT Motherboard User’s Manual | 11 |
