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 edit
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