INTCODE

from The Free On-line Dictionary of Computing (8 July 2008)

INTCODE

   A low-level interpreted language used in {bootstrapping} the
   {BCPL} compiler.  The INTCODE machine has six control
   {registers} 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].