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Intel 4004Developed by Ted Hoff, Masatoshi Shima, and others at Intel and released on November 15, 1971, the 4004 was the first processor with a 4-bit register and a clock speed of 740 kHz. Smaller than a human thumbnail, the 4004 had 2,300 transistors with 10-micron spacing, 60,000 operations per second (OPS), and cost $200.00, while possessing as much computing power as the ENIAC computer.

The picture is an example of the original Intel 4004 chip.

Also see: CPU terms