Source : Free On-Line Dictionary of Computing

Intel 4040
     
         An enhanced version of the {Intel 4004}, adding 14
        instructions, larger (8 level) {stack}, 8 kbyte program memory
        and {interrupt} abilities (including shadows of the first 8
        {register}s).  The 4040 was similar to the {Intel 8008}.
     
        (1994-10-31)