Commodore DOS, aka CBM DOS, was the disk operating system used with Commodore's 8-bit computers. Unlike most other DOS systems before or since, CBM DOS was integrated in the internal ROM of the floppy disk drives(as well as the very few hard disk models Commodore made for its 8-bit range), not loaded from disk into the computer's own RAM at startup.
Versions of CBM DOS
1.0
X.Y
2.6 – the most common version due to its use in the 1541 floppy disk drive
S.T
References
Immers, Richard; Neufeld, Gerald G. (1984). Inside Commodore DOS. The Complete Guide to the 1541 Disk Operating System. DATAMOST, Inc & Reston Publishing Company, Inc. (Prentice-Hall). ISBN 0-8359-3091-2.
Unlike most other DOS systems before or since—which were/are booted from disk into the system's own RAM at startup, and executed there—CBM DOS was executed internally in the drive: the DOS resided in drive-internal ROM chips, and was run by a dedicated MOS 6502 CPU.
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.
During the Commodore 64 era, this was the subject of a great deal of controversy, due to alleged bugs in the command's implementation on the 154x and 157x series drives.
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