How to Distinguish MS-DOS 5.0a from MS-DOS 5.0 (82164)

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

This article was previously published under Q82164


Microsoft MS-DOS version 5.0a is a "maintenance" update to MS-DOS version 5.0. MS-DOS 5.0a corrects minor problems that exist in MS-DOS 5.0, and synchronizes disk-based MS-DOS with the ROM version of MS-DOS 5.0. MS-DOS 5.0a provides no new features or enhancements beyond those provided in MS-DOS 5.0.

If you are encountering problems with MS-DOS 5.0, contact MS-DOS technical support to see if MS-DOS 5.0a will correct the problems.


The following table will help you to quickly identify MS-DOS 5.0a from MS-DOS 5.0.

Please note that if you have an original equipment manufacturer's (OEM) release of MS-DOS 5.0, the following may not apply. Consult with your OEM for more information. The table is accurate for the Microsoft MS-DOS 5 Upgrade.
                                   MS-DOS Version
                               5.0               5.0a
                               ---               ----

File date:                     4/9/91            11/11/91

Number of 5.25-inch disks:     6 (360K)          2 (1.2 MB)

Setup switches:                /B,/F,/U,/M       /B,/F,/U,/M,/I

"Getting Started"              55 pages          156 pages
                               (not indexed)     (indexed)

Modification Type: Major Last Reviewed: 9/30/2003
Keywords: KB82164