Source : Free On-Line Dictionary of Computing

INTCODE
     
        A low-level interpreted language used in {bootstrapping} the
        {BCPL} compiler.  The INTCODE machine has six control
        {register}s and eight functions.  {OCODE} was used as the
        intermediate language.
     
        ["INTCODE - An Interpretive Machine Code for BCPL",
        M. Richards, Computer Lab, U Cambridge 1972].
     
        ["BCPL - The Language and its Compiler", Martin Richards &
        Colin Whitby-Stevens, Cambridge U Press 1979].