DOS 4.0

DOS 4.02 versions

Version strings displayed by COMMAND.COM and VER command in IBM DOS 4.02.

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4 Responses to DOS 4.02 versions

  1. Chris says:

    Hello Michal.
    Some source are saying that PS/1 computers had DOS 4.01 in ROM.
    So, what identifies this DOS as 4.02 and not 4.00 or 4.01 ?

  2. Michal Necasek says:

    The timestamps, essentially… the displayed version strings never changed, but the PS/1 DOS shows Copyright 1990, which makes it significantly newer than the 1988 release of 4.01. The file dates are also correspondingly newer.

  3. DiskingRound says:

    Mind sharing this or uploading it to Beta Archive?

  4. Michal Necasek says:

    Sorry, I don’t have the original disks or anything worth preserving, just a few files.

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