Library /sys$common/syshlp/helplib.hlb  —  MACRO  /ALPHA  Directives  .BLKx  Parameter
 expression

    An integer expression specifying the amount of storage to be
    allocated. All the symbols in the expression must be defined
    at the current point in the assembly and the expression must be
    an absolute expression. If the expression is omitted, a default
    value of 1 is assumed.
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