Source : Free On-Line Dictionary of Computing

Executive Systems Programming Oriented Language
     
         An {ALGOL} superset with high level instructions
        for low level actions, e.g. interrupting another processor on
        a multiprocessor system.  Its single pass compiler was very
        fast: over 250 lines/s on a 10MHz processor.
     
        ESPOL was used to write the MCP (Master Control Program) on
        the {Burroughs 6700}.  It was superseded by {NEWP}.
     
        ["The B6700 ESPOL Reference Manual", Burroughs, 1970].
     
        (2001-06-14)