Block storage allocation directives

    Format

      .BLKA  [expression]

      .BLKB  [expression]

      .BLKD  [expression]

      .BLKF  [expression]

      .BLKG  [expression]

      .BLKL  [expression]

      .BLKO  [expression]

      .BLKQ  [expression]

      .BLKS  [expression]

      .BLKT  [expression]

      .BLKW  [expression]