! *** PREDECLARED TYPES
     
      %IF %DECLARED ( %BASIC$QUADWORD_DECLARED ) = 0 %THEN
         RECORD BASIC$QUADWORD
            LONG FILL ( 2 )
         END RECORD
         %LET %BASIC$QUADWORD_DECLARED = 1
      %END %IF
     
      %IF %DECLARED ( %BASIC$OCTAWORD_DECLARED ) = 0 %THEN
         RECORD BASIC$OCTAWORD
            LONG FILL ( 4 )
         END RECORD
         %LET %BASIC$OCTAWORD_DECLARED = 1
      %END %IF
     
      %IF %DECLARED ( %BASIC$HFLOAT_AXP_DECLARED ) = 0 %THEN
         RECORD BASIC$HFLOAT_AXP
            LONG FILL ( 4 )
         END RECORD
         %LET %BASIC$HFLOAT_AXP_DECLARED = 1
      %END %IF
     
      %IF %DECLARED ( %BASIC$F_FLOATING_COMPLEX_DECL ) = 0 %THEN
         RECORD BASIC$F_FLOATING_COMPLEX
            SINGLE REAL_PART
            SINGLE IMAGINARY_PART
         END RECORD
         %LET %BASIC$F_FLOATING_COMPLEX_DECL = 1
      %END %IF
     
      %IF %DECLARED ( %BASIC$D_FLOATING_COMPLEX_DECL ) = 0 %THEN
         RECORD BASIC$D_FLOATING_COMPLEX
            DOUBLE REAL_PART
            DOUBLE IMAGINARY_PART
         END RECORD
         %LET %BASIC$D_FLOATING_COMPLEX_DECL = 1
      %END %IF
     
      %IF %DECLARED ( %BASIC$G_FLOATING_COMPLEX_DECL ) = 0 %THEN
         RECORD BASIC$G_FLOATING_COMPLEX
            GFLOAT REAL_PART
            GFLOAT IMAGINARY_PART
         END RECORD
         %LET %BASIC$G_FLOATING_COMPLEX_DECL = 1
      %END %IF
     
      %IF %DECLARED ( %BASIC$H_FLOAT_AXP_CMPLX_DCL ) = 0 %THEN
         RECORD BASIC$H_FLOATING_COMPLEX_AXP
            BASIC$HFLOAT_AXP REAL_PART
            BASIC$HFLOAT_AXP IMAGINARY_PART
         END RECORD
         %LET %BASIC$H_FLOAT_AXP_CMPLX_DCL = 1
      %END %IF
    
    
    ! +
    !  EXTENDED MAGTAPE CHARACTERISTICS BITS
    ! -
      DECLARE LONG CONSTANT MT2$M_SUP_DENS = x'0000FFFF'
      DECLARE LONG CONSTANT MT2$M_WBC_ENABLE = x'00010000'
      DECLARE LONG CONSTANT MT2$M_RDC_DISABLE = x'00020000'
      DECLARE LONG CONSTANT MT2$M_CACHED_DATA = x'00040000'
      DECLARE LONG CONSTANT MT2$M_CD_LOST = x'00080000'
      DECLARE LONG CONSTANT MT2$M_TAPE_MARK = x'00100000'
      DECLARE LONG CONSTANT MT2$M_COMP_SUP = x'00200000'
      DECLARE LONG CONSTANT MT2$M_COMP_ENA = x'00400000'
      DECLARE LONG CONSTANT MT2$M_MT3_SUPPORTED = x'00800000'
      DECLARE LONG CONSTANT MT2$M_ALLOWFAST_SUP = x'01000000'
      DECLARE LONG CONSTANT MT2$M_ALLOWFAST_ALWAYS = x'02000000'
      DECLARE LONG CONSTANT MT2$M_ALLOWFAST_PER_IO = x'04000000'
      DECLARE LONG CONSTANT MT2$M_ALLOWFAST_NEVER = x'08000000'
      DECLARE LONG CONSTANT MT2$S_MT2DEF = 4
      record MT2DEF
         variant
            case
               group MT2$R_MT2DEF_BITS
                   !  SUPPORTED DENSITIES
                   !  WRITE-BACK CACHING IS ENABLED
                   !  READ CACHING IS DISABLED
                   !  CLASS DRIVER DETECTED DATA IN CACHE
                   !  CLASS DRIVER DETECTED CACHED DATA LOST
                   !  TAPE MARK HAS BEEN WRITTEN
                   !  COMPACTION supported 
                   !  COMPACTION enabled 
                   !  Driver supports Multiple Tape Densities. 
                   !  SCSI Fast Search supported
                   !  ALWAYS use Fast Search
                   !  PER_IO use of Fast Search
                   !  NEVER use Fast Search 
                  LONG SUP_DENS_bits   ! COMMENT ADDED BY SDL - SUP_DENS_bits contains bits SUP_DENS through FILL_11_
               end group MT2$R_MT2DEF_BITS
         end variant
      end record MT2DEF