Microsoft KB Archive/104764

= IRQ Conflicts on Gateway 2000 Computers =

Article ID: 104764

Article Last Modified on 10/31/2006

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APPLIES TO


 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.1
 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51

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This article was previously published under Q104764



When installing Windows NT on some Gateway 2000 computers, IRQ conflicts may arise because of the default settings for COM ports or modems. If you have a built-in modem, it is usually set up to use COM1 and IRQ 4. There are also two additional COM ports configured as On Board COMA and On Board COMB in your computer CMOS. If a modem is installed, On Board COMA will normally have the following settings by default:

  On board COMA:      COM3

COMA_IRQ: IRQ-5

When installing other devices that use an IRQ, such as network cards or sound cards, you may encounter IRQ conflicts if those devices are configured to use IRQ 5.

For example, the Gateway may also include a Sony CDU-31A CD-ROM drive which uses IRQ 5 under Windows NT. If you follow the guidelines for installing that device in Windows NT, the CD-ROM still may not work properly. The IRQ conflict can be avoided by changing the COMA_IRQ setting in the CMOS or by setting up the device to use a different IRQ. To adjust IRQ settings, press CTRL+ALT+ESC at a command prompt or during boot to access the CMOS setup (ESC+F1 may also work). COMA_IRQ can be set to 4, 5, 9, or Disabled.

For additional information on using the Sony CDU 31A with Windows NT, query on the following words in the Microsoft Knowledge Base:

  sony cdu

For additional information on Gateway computers, contact Gateway technical support at (800) 846-2301.

The products included here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words: prodnt

Keywords: kbhardware KB104764

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