Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Bit Mask
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  Syntax:   MASK record
 
            MASK recordfieldname
 
  See also: WIDTH, NOT, RECORD
 
  Description:
 
     Returns a bit mask for the bit positions in a record or record
     field. A bit in the mask contains a 1 if that bit corresponds to
     a field bit. All other bits contain 0.
 
     The <record> parameter is the name of any record. The
     <recordfieldname> parameter is the name of any field in a record.
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