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The once, and future, Commodore 64
Apple and IBM too pricey for you? Commodore, with its Commodore 64, a computer inside of a keyboard that required a spare TV for the interface, had the machine for you at $299. It wasn't much of a PC -- 64K of memory was small even by 1983 standards -- but it proved amazingly popular. Indeed, Commodore recently released a 21st century Commodore 64 running Linux.