PDF document. 1973. This manual has been written to help the reader program the INTEL 4004 microcomputer in assembly language, and to show how it is economical and practical to do so. INTEL 4004 system was the world's first microprocessor, created by Federico Faggin in 1971. 4 bit parallel CPU on a single chip. 46 instructions, including conditional branching, subroutine capability and binary and decimal arithmetic modes. Direct addressing for 32,768 bits of read-only memory, 5120 bits of data random-access memory and 32 768 bits of program random-access memory. Sixteen 4 -bit index registers and a three 12 -bit register stack.

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