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The 4004 was released today in 1971. What was it?

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Answer:

The first commerical microprocessor. The processor was first used in a calculator produced by a Japanese company called Busicom. According to Intel, "In 1971, the Intel 4004 processor held 2,300 transistors. In 2010, an Intel Core processor that includes a 32nm processing die with second-generation High-k metal gate silicon technology holds 560 million transistors."