Intel 4004

<processor> The world's first microprocessor, released in 1971.

The 4004 contained 2300 transistors (compared with 5.5 million in the 1996 Pentium Pro) and was intended for use in a calculator.

It processed data in 4 bits, but its instructions were 8 bits long.

Program and Data memory were separate, it had 1 kilobyte of data memory and a 12-bit PC for 4K of program memory (in the form of a 4 level stack, used for CALL and RET instructions).

There were also sixteen 4-bit (or eight 8-bit) general purpose registers.

The 4004 had 46 instructions.

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