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[ The PC Guide | Systems and Components Reference Guide | Motherboard and System Devices | System Resources | Interrupts (IRQs) | IRQ Details By Number ]

IRQ7

IRQ Number: 7

16-Bit Priority: 15

Bus Line: 8/16-bit

Typical Default Use: LPT1 (first parallel port).

Other Common Uses: COM3 (third serial port), COM4 (fourth serial port), modems, sound cards, network cards, tape accelerator cards.

Description: This IRQ is used on most systems to drive the first parallel port, normally for the use of a printer. These days of course many other devices use parallel ports, including external drives. If you are not using a printer or other device then IRQ7 can be used in a similar way to IRQ5: as an alternate for any of the devices that would normally be fighting over IRQ3 or IRQ4.

Conflicts: Conflicts on IRQ7 are relatively unusual. One thing to watch out for if you are using two parallel ports is to make sure the second one is set up to use IRQ5 or another available IRQ. Some add-in parallel boards try to make LPT2 also use IRQ7, which generally won't work. Otherwise, avoiding using IRQ7 for an expansion card if you are using it for LPT1 will eliminate conflicts in most cases.

Next: IRQ8


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