The Vic 20 used CBM (Commodore Business Machines)Basic V2.0, hence the 20. VIC came from Video Interface Controller (which was the 6561 chip used for the graphics and joystick/paddle/lightpen ports). The VIC chip itself was a clone of the graphics and controller interface from the Atari 2600 game console.
As an aside here, Atari and CBM vere very close cousins, partly thanks to Jack Tramiel, who used to change between the two companies as he felt like it!
CBM V1 was the implementation prior to this for the Commodore PET. The difference? The Vic had extra commands to handle colour - whoop de doo!
The History of DOS
One of the first operating systems for personal computers was DOS. This operating system was a cut-down implementation of the CP/M operating system designed for the 8088 family of computers. The original implementation, called QDOS (Quick-and-Dirty Operating System), was designed by Tim Patterson for Seattle Computer Products. This product was eventually licensed to Microsoft, and Microsoft then demonstrated the operating system to IBM some ten months later.
IBM originally used the acronym DOS in the early 1960?s for their disk operating system for the 360 series computers.
So either way, DOS predatesthe IBM 'PC' :-)
I have an implementation of the original V1 QDOS for the Radio Shack TRS80 (Z80 based)...circa 1978. I also still have a VIC20 and fire up the occasional game from cassette when I think my 4.2GHz AMD games beast seems to be sluggish...it puts everything into perspective!