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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“Were headed for collapse, if you want my opinion, Missy. I can see it in the fallin off of the quality of vagrants. There was a time you could find real good company in almost any jungle youd pick, men who could talk, men whod read a book now and then; and now, what do you find, a lot of dirty little guttersnipes no decent tramp would want to associate with.
Well, its been that way all through history.”
—John Dos Passos (18961970)