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[ 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 devices.
  • 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.

Next: IRQ0


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