Potential IRQ Conflicts
Written by The Geekette on January 25, 2010 – 2:45 pmPosted in Hardware, Windows | No Comments »
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Loading ...| IRQ |
Devices used and potential conflicts |
| 0 | This IRQ is used within the system board for system timing. If a conflict arises with this IRQ chances are the system board is bad, use a diagnostic program to determine if this is the case. |
| 1 | This IRQ is assigned to the keyboard. Its never available to other add-in cards. Again if this is the problem, its most likely a problem with the system board. |
| 2 | This IRQ was assigned to older EGA video cards. Beware, IRQ 9 uses IRQ to communicate with the CPU, therefore this IRQ should only be used under extreme circumstances. |
| 3 | This IRQ is assigned to the serial ports: COM 2, and COM 4. Avoid setting other devices to this IRQ since mice, modems, and other devices are set to use this IRQ. |
| 4 | This IRQ is assigned to the serial ports: COM 1, and COM 3. Remember IRQ lines for the most part cannot be shared, so generally you can’t have devices on COM 1 and COM 3 that are both active and working. |
| 5 | This IRQ is assigned to a secondary printer port LPT2, but in the absence of a second printer port, it is used primarily for sound cards, or as an alternative IRQ for the COM ports. |
| 6 | This IRQ is assigned to the diskette controller. Few if any devices leave this IRQ as an option, since most systems have a floppy drive built into them. |
| 7 | This IRQ is assigned to the first parallel port LPT1, its also made available to other add-in cards, but should not be used for anything except the printer port to avoid conflicts. |
| 8 | This IRQ is reserved for the internal real-time clock. This line is never available to other add-in cards. If there is a conflict here, its an indication of a motherboard problem. |
| 9 | This IRQ uses IRQ 2 to talk to the CPU, so it has a high priority. Its generally used for network cards. |
| 10 | This IRQ is left open for network cards, sound cards, SCSI host adapters. |
| 11 | This IRQ is a common one for SCSI host adapters, but can also be used for a variety of other devices. |
| 12 | This IRQ is used for the PS/2 style mouse port included on many motherboards. If the PS/2 mouse port is enabled in the system’s setup program, and you’re using a PS/2 connection mouse, don’t use this port for anything else, otherwise its an available one. |
| 13 | This IRQ is reserved for the Numeric Processing Unit (math coprocessor) It is never available for anything else. |
| 14 | This IRQ is assigned to the primary hard drive interface |
| 15 | This IRQ is assigned to the secondary hard drive interface. |
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Tags: Conflicts, Hardware, irq, Potential
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