CBM DOS Versions
At least seven distinctly numbered versions of Commodore DOS are known to exist; the following list gives the version numbers and related disk drives. Unless otherwise noted, drives are 5¼-inch format. The "lp" code designates "low profile" drives. Drives whose model number starts with 15 connect via Commodore's unique serial (TALK/LISTEN) protocols, all others use IEEE-488.
- 1.0 – found in the 2040 and 3040 floppy drives
- 2.0 – found in the 4040 and 3040 floppy drives
- 2.5 – found in the 8050 floppy drives
- 2.6 – found in the 1540, 1541, built-in SX-64 drive, 1551, 2031 (+"lp"), and 4031 floppy drives
- 2.7 – found in the 8050, 8250 (+"lp"), and SFD-1001 floppy drives
- 3.0 – found in the 1570, 1571, and 8280 floppy drives (8280: 8-inch), as well as the 9060 and 9090 hard drives
- 3.1 – found in the built-in 1571 drive of C128D/DCR computers
- 10.0 – found in the 1581 (3½-inch)
Version 2.6 was by far the most commonly used, and known, DOS version, due to its use in the 1541 (which sold in large numbers to users of C64s), and its emulation in the numerous third-party clones of that drive.
The revised firmware for the 1571 which fixed the relative file bug was also identified as V3.0. Thus it is not possible to tell the two versions apart by version number alone.
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