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The modern personal computer can most logically be traced to 1958. That summer, Jack Kilby, a newly hired engineer at Texas Instruments, invented the integrated circuit - two transistors combined on a single silicon wafer.
This is widely seen as the first step in what became the personal computer revolution - for it meant that computers no longer had to be built of physical switches or vacuum tubes, but could instead have thousands, eventually millions, of those electrical switches embedded on a single chip, reducing both the size and cost of a computer.
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