Avoiding Interrupt Assignment Conflicts
Problems can arise if two devices attempt to use the same interrupt request (IRQ) line. To avoid this type of conflict, check the documentation for the IRQ line's default for each installed expansion card. Then consult Table
Table 4-1. IRQ Line Assignment Defaults
IRQ Line | Used By/Available |
|
|
IRQ0 | Used by the system timer |
IRQ1 | Used by the keyboard to signal that the output buffer is full |
IRQ2 | Used by interrupt controller 1 to enable IRQ8 through IRQ15 |
IRQ3 | Used by serial port 2 (COM2 and COM4) |
IRQ4 | Used by serial port 1 (COM1 and COM3) |
IRQ5 | Available unless used by a secondary parallel port |
IRQ6 | Used by the diskette drive controller |
IRQ7 | Used by the primary parallel port |
IRQ8 | Used by the RTC |
IRQ9 | Used for power management functions |
IRQ10 | Available |
IRQ11 | Available |
IRQ12 | Used by the PS/2 mouse port unless the mouse is disabled in the Sys- |
| tem Setup program |
IRQ13 | Used by the math coprocessor |
IRQ14 | IDE secondary |
IRQ15 | IDE primary |
|
|
NOTE: For the full name of an abbreviation or acronym used in this table, see the abbreviations and acronyms list at the end of this guide.
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