DOS 20

DOS 20 may refer to IBM OS/2 versions:

OS/2 2.0 ("DOS" version 20.00)
OS/2 2.1 ("DOS" version 20.10)
OS/2 Warp 3 ("DOS" version 20.30)
OS/2 Warp 4 ("DOS" version 20.40)
OS/2 Warp 4.5 ("DOS" version 20.45)

See also

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