Defines a block of bytes, words, or longwords, initialized with null characters. Pushes labels outside the block.
ds[.(b|w|l)] size
b
Byte specifier.
w
Word specifier (the default).
l
Longword specifier.
size
Number of bytes, words, or longwords in the block.
This statement defines a block big enough for the structure DRVRHeader:
ds.b sizeof(DRVRHeader)