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The first Commodore computer built during Tramiel's tenure was called the PET 2001 or Personal Electronic Transactor and was released in 1977. According to the Commodore PET Alive fan site: it "was a fully integrated computer with the monitor, motherboard, keyboard and cassette drive all in one package" - a big advantage over the competition.
The first PET models had 4KB of RAM and a black-and-white screen of 40x25 character graphics. Later models featured 8KB RAM and 12-inch screens. It also had a chicklet keyboard.
PET's astounding early success was a big surprise to Commodore leading to major backorders soon after it was launched.
Three years later, the VIC-20 showed up as a cheaper alternative to the PET 2001. It was limited with 5KB of RAM (3.5KB useable) but it did have a 40-KB add-on memory cartridge. The VIC-20 did have a real keyboard and sold at retail stores (K-Mart) for $299.99. It also featured the first modem under $100.
The VIC-20 was the best-selling computer in 1982, with 800,000 units sold. It was quickly forgotten after the new and improved Commodore 64 was released in 1983.
Next came the all-time champion, the Commodore 64. This proved to be the first computer for millions (including myself) with all-time record sales of at least 12.5 million units although many estimates figure the number to be around 17 million.
The C64 was an 8-bit machine that ran on 64KB of RAM. Its audio and video were improved over previous computers and it cost just $599 when released - about half the price of an Apple IIe. Its price eventually dropped to $199. C64 was also marketed for the masses - sold in retail stores - repeating the success of the VIC-20.