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ASSEMBLER DIRECTIVES->Other Assembler Directives->DS Define Storage

DS is the define storage directive used to reserve locations in memory for specific purposes.  The DS directive allocates a specified number of bytes depending on the size specification as follows:

Size Specification

Bytes Reserved

Byte (.B)	1
Word (.W)	2
Long word (.L)	4

.W is assumed if no size is specified.

Formats:

DS.B	<expression>	<comment>
DS.W	<expression>	<comment>
DS.L	<expression>	<comment>
DS	<expression>	<comment>

where <expression> evaluates to the number of units to be reserved.