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The Abacus, around 1000 B.C. Of course, if you mean personal computer, it started with the IBM mainframes in the 1950s, and branched off for a while, finally creating the first personal computer, the DATAPOINT 2200, in 1970, and the MITS Altair 8800, in 1975, then the Apple ][ in 1977, finally with the invention of the IBM 5150 in 1981, the first modern PC. The IBM 5100, the first commercially available portable computer, appeared in September 1975, and was based on the SCAMP prototype.

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12y ago

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