%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 ADDRESSED HOSTS BEING 1N AND
! 16 BIT WORD ADDRESSED HOSTS BEING 2N ETC
%CONSTINTEGER EMAS=10;                  ! emas on 2900 (unsigned shorts)
%CONSTINTEGER IBM=11;                   ! emas on 24 bit ibm hardware
%CONSTINTEGER IBMXA=12;                 ! emas of XA 31 bit hardware
%CONSTINTEGER WWC=13;                   ! WWc (Natsemi chip) completely swopped
%CONSTINTEGER DRS=13;                   ! former name for WWC till ICL switched chips
%CONSTINTEGER AMDAHL=14;                ! Emas on Amdahls guess at Xa Minor differences fron IBM)
%CONSTINTEGER PERQ3=15;                 ! ICL packaged 68k chip Unix stack but not swopped
%CONSTINTEGER GOULD=16;                 ! Gould unswopped forward stack. Needs 4&8 byte alined
%CONSTINTEGER PERQ=20;                  ! Pos perq now obselete. Fully swopped forward stack
%CONSTINTEGER PNX=21;                   ! ICL's perq2 Unix stack byte swopped (unsigned shorts)
%CONSTINTEGER ACCENT=22;                ! Perq 1 under accent. obsolete now
                                        ! ACCENT DIFFERS FROM PERQ ONLY IN
                                        ! ASSEMBLES SEQUENCES&SYNTAX
                                        ! AND GENERATOR
%CONSTINTEGER UNSIGNEDSHORTS=1<<emas!1<<pnx
%CONSTINTEGER LINTAVAIL=1<<IBM!1<<IBMXA!1<<amdahl!1<<EMAS
%CONSTINTEGER LLREALAVAIL=1<<IBM!1<<IBMXA!1<<amdahl!1<<EMAS