Leading Edge XT Setup Problem with MS-DOS (74871)

The information in this article applies to:
    Microsoft MS-DOS operating system 5.0
    Microsoft MS-DOS operating system 5.0a
    Microsoft MS-DOS operating system 6.0
    Microsoft MS-DOS operating system 6.2
    Microsoft MS-DOS operating system 6.21
    Microsoft MS-DOS operating system 6.22

This article was previously published under Q74871


Leading Edge XT computers are shipped with only Phoenix BIOS and require either version 3.0 or 3.1 of Phoenix BIOS to set up and run correctly with MS-DOS version 5.0 or later. A BIOS upgrade is available from Leading Edge directly or from a Leading Edge distributor. Version 3.11 of Phoenix BIOS (currently the latest version) should not be used as an upgrade, however, because it does not work properly with MS-DOS 5.0 or later on a Leading Edge XT computer.


Leading Edge has acknowledged that either version 3.0 or 3.1 of Phoenix BIOS is required on their XT-class computers to work correctly with MS-DOS 5.0 or later. If an earlier version is used, the Microsoft MS-DOS 5 or later Upgrade will not install. After SETUP is typed at the command prompt, the cursor appears below the prompt, and the system hangs, requiring a system restart (both a "cold" and a "warm" restart usually work). A similar effect also occurs when version 3.11 (the latest release) of Phoenix BIOS is used.

Leading Edge is providing a BIOS upgrade for $45.00. To receive this upgrade, mail Leading Edge at the address below, and include the model number of the computer and a money order for $45.00. The upgrade is also available through Leading Edge distributors (usually at a higher cost than purchasing directly through Leading Edge.)

If version 3.11 is causing the problem, there is no "downgrade" currently available. A future release of Phoenix BIOS for the Leading Edge XT might provide compatibility.

The product included here, Leading Edge XT, is manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

Modification Type: Major Last Reviewed: 5/12/2003
Keywords: KB74871