Which company used to produce the Pet, Vic20 and 64 models of computers?

Commodore International was an American home computer and electronics manufacturer founded by Jack Tramiel. The company developed and marketed the world's best-selling desktop computer, the Commodore 64 (1982).

Once Chuck Peddle had taken over engineering at Commodore, he convinced Jack Tramiel that calculators were already a dead end, and that they should turn their attention to home computers. Peddle packaged his single-board computer design in a metal case, initially with a keyboard using calculator keys, later with a full-travel QWERTY keyboard, monochrome monitor, and tape recorder for program and data storage, to produce the Commodore PET (Personal Electronic Transactor). From PET's 1977 debut, Commodore would be a computer company.

Commodore reemphasized the US market with the VIC-20. The PET computer line was used primarily in schools, where its tough all-metal construction and ability to share printers and disk drives on a simple local area network were advantages, but PETs did not compete well in the home setting where graphics and sound were important. This was addressed with the VIC-20 in 1981, which was introduced at a cost of US$299 and sold in retail stores. Commodore bought aggressive advertisements featuring William Shatner asking consumers "Why buy just a video game?" The strategy worked and the VIC-20 became the first computer to ship more than one million units.