Specifying input parametersUsing LCDS Print Description Language 2-15• If a block length is specified that is less than the minimumblock length that is found on the tape, the system allocatesinput buffers, which are sized to the minimum tape blocklength. It is wise to specify the maximum block length in theJSL, so that input buffers are large enough to handle thelargest block. However, specifying the maximum block lengthin the JSL may slow performance. If the actual tape blocklength is smaller than the JSL block length, no error messageis reported; otherwise, an error is displayed.• The length on a 4 by 3 packed format tape is the number of 6-bit bytes or characters in the tape block.BLOCK LMULTSpecifies a multiplication factor that is applied to the contents ofthe block length field to determine the true block length.Syntax BLOCK LMULT = valueOptionsDefault 1BLOCK LTHFLDSpecifies the length of the field that contains the block length.Syntax BLOCK LTHFLD = sizeOptionsTable 2-9. BLOCK LMULT parameter options and definitionsOption Definitionvalue An integer in the range of 1 to 15 that is multiplied by the value in the lengthfield (refer to LENGTH parameter) to compute the number of bytes in the block.Table 2-10. BLOCK LTHFLD parameter options and definitionsOption Definitionsize An integer from 0 to 5 that specifies in bytes the length of the field that containsthe block length.
