VMS Help MACRO, VAX MACRO Assembler, Directives, .BLKx, .BLKD  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Reserves   storage   for   double-precision    floating-point
    data (quadwords).

    .BLKD expression

    expression

    An expression specifying the amount of storage to be allocated.