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 ROM chips inside the drive, and was run there by one or more dedicated MOS 6502 family CPUs.
Read more about Commodore DOS: CBM DOS Versions, DOS Commands
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