CONSTINTEGER  YES=1,NO=0
            
!
! THESE CODE ARE ARBITARY BUT THE TOP DECIMAL DIGIT GIVES THE NO OF BYTES
! IN THE UNIT OF ADDRESSABILITY. BYTE ADDRESSES HOSTS BEING 1N AND
! 16 BIT WORD ADDRESSED HOSTS BEING 2N ETC
CONSTINTEGER  EMAS=10
CONSTINTEGER  IBM=11
CONSTINTEGER  IBMXA=12
CONSTINTEGER  PERQ=20
CONSTINTEGER  PNX=21
CONSTINTEGER  DRS=22
CONSTINTEGER  ACCENT=23
                                        ! ACCENT DIFFERS FROM PERQ ONLY IN
                                        ! ASSEMBLES SEQUENCES&SYNTAX
                                        ! AND GENERATOR
CONSTINTEGER  LINTAVAIL=1<<EMAS
CONSTINTEGER  LLREALAVAIL=1<<EMAS