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Computing (FOLDOC) dictionary
Intel 4004
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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.