Commodore 64 (1982)

 The best selling computer of all time still appears to be the Commodore 64: Estimates of this PC's sales range from 15 million to 22 million units. The first C64 cost $595 and came with 64KB of RAM, a 6510 processor, 20KB of ROM with Microsoft BASIC, 16-color graphics, and a 40-column screen. (How times have changed!) It also was the first PC with an integrated sound synthesizer chip, according to Ian Matthews of Commodore.ca.