[1] : The Free On-line Dictionary of Computing (27 SEP 03)

intel 4004
     
         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.
     
        1997-03-30
     
     
see also:
microprocessor pentium pro kilobyte pc stack registers 

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