%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 DRS=13
%CONSTINTEGER AMDAHL=14
%CONSTINTEGER PERQ=20
%CONSTINTEGER PNX=21
%CONSTINTEGER ACCENT=22
                                        ! ACCENT DIFFERS FROM PERQ ONLY IN
                                        ! ASSEMBLES SEQUENCES&SYNTAX
                                        ! AND GENERATOR
%CONSTINTEGER LINTAVAIL=1<<IBM!1<<IBMXA!1<<EMAS
%CONSTINTEGER LLREALAVAIL=1<<IBM!1<<IBMXA!1<<EMAS