Syntax: <label> EQU <number>
Operation: Equate a value to a label. The EQU directive
associates a given value specified by a number or
numeric equation with a required label. Using this
label in subsequent code will result in a direct subst-
itution of the associated value. Note that a label must
be defined within a file before it is used. Once defined
with an EQU statement, a label cannot be redefined.