High Quality Content by WIKIPEDIA articles! 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—which are booted from disk into the main computer'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 one or more dedicated MOS 6502 family CPUs physically located inside the drive case.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 5 1/4 -inch format.

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