[ The PC Guide | Systems and Components Reference Guide
| Motherboard and System Devices | System
Resources | Interrupts (IRQs) ]
IRQ Details By Number
This section lists each of the 16 interrupt lines and provides a full description of
what they are, how they are normally used, and any special information that is relevant to
them. The general format for each section is as follows:
- IRQ Number: The number of the IRQ from 0 to 15.
- 16-Bit Priority: The priority level of the interrupt.
1 is the highest and 15 is the lowest.
- Bus Line: Indicates whether or not this IRQ is available
to expansion devices on the system bus. This will say "8/16 bit" for an
interrupt line available to all expansion devices, "16 bit only" for a line
available only to 16-bit cards, or "No" for an interrupt used only by system
- Typical Default Use: Description of the device or function that normally uses
this IRQ in a regular modern PC.
- Other Common Uses: This is a list of other devices that commonly either use this
IRQ or offer the use of this IRQ as one of their options. This list isn't exhaustive
because there are a lot of oddball cards out there that may use unusual IRQs.
- Description: A description of the interrupt and how it is used, along with any
relevant or interesting points about it or its history.
- Conflicts: A discussion of the likelihood of conflicts with this IRQ and what are
the likely causes.
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