MACRO-64 has the following 11 block storage directives:

    DirectivReserves Storage for:  Bytes Allocated

    .BLKA   Addresses (quadwords)  8 * value of expression
    .BLKB   Byte data              Value of expression
    .BLKD   Double-precision       8 * value of expression
            floating-point data
            (quadwords)
    .BLKF   Single-precision       4 * value of expression
            floating-point data
            (longwords)
    .BLKG   G_floating data        8 * value of expression
            (quadwords)
    .BLKL   Longword data          4 * value of expression
    .BLKO   Octaword data          16 * value of expression
    .BLKQ   Quadword data          8 * value of expression
    .BLKS   S_floating data        4 * value of expression
            (longwords)
    .BLKT   T_floating data        8 * value of expression
            (quadwords)
    .BLKW   Word data              2 * value of expression

    Each directive reserves storage for a different data type. The
    value of the expression determines the number of data items for
    which MACRO-64 reserves storage. For example, .BLKL 4 reserves
    storage for 4 longwords of data and .BLKB 2 reserves storage for
    2 bytes of data. The total number of bytes reserved is equal to
    the length of the data type times the value of the expression.