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Intel 4004

The Intel 4004, a 4-bit CPU, was the world's first microprocessor. It was released in 16-pin ceramic DIP packaging on November 15th, 1971. The 4004 was the first computer processor designed and manufactured by chip maker Intel, which previously made semiconductor memory chips.

The chief designers of the chip were Ted Hoff and Federico Faggin.

Originally designed for the Japanese company Busicom to be used in their line of calculators, the 4004 was also provided with a family of custom support chips (e.g., each "Program ROM" internally latched for its own use the 4004's 12-bit program address, which allowed 4 KB memory access from the 4-bit address bus if all 16 ROMs were installed). The 4004 circuit was built of 2,300 transistors, and was followed the next year by the first ever 8-bit microprocessor, the 3,300 transistor 8008 (and the 4040, a revised 4004).

As its fourth entry in the microprocessor market, Intel released the CPU that started the microcomputer revolution — the 8080.

Table of contents
1 Technical specifications
2 Custom support chips
3 Collectability
4 External links

Technical specifications

Custom support chips

Note: a 4001 chip cannot be used in a system along with 4008/4009 chip pair.


The Intel 4004 is probably the world's most sought-after collectable / antique chip. Of highest value are 4004's that are gold and white, with visible so called 'grey traces' on the white portion. As of January 2004, such chips reached around US$400 each on eBay. The slightly less valuable white and gold chips without grey traces typically reach $US200 to US$300. Those chips without a 'date code' on the underneath are earlier versions, and are therefore worth slightly more.

See also: List of Intel microprocessors

External links