DOS 20 explained

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

• DOS (disambiguation)
• DOS 2 (disambiguation)
• DOS 10 (disambiguation)
• DOS 30