Zilog ZUSBOPTS - Manual (Page 308)

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TOP OF
The TOP OF operator provides the highest allocated address of a group, address space, or
segment, excluding any segment copies when <name> is a segment. The value of TOP OF
is treated as an expression value.
Syntax
TOP OF
<name> can be a group, address space, or segment.
If you declare a segment to begin at TOP OF another segment, the two segments share one
memory location. TOP OF give the address of the last used memory location in a segment,
not the address of the next available memory location. For example,
LOCATE segment2 at TOP OF segment1
starts segment2 at the address of the last used location of segment1 . To avoid both seg-
ments sharing one memory location, use the following syntax:
LOCATE segment2 at (TOP OF segment1) + 1
^ (Bitwise Exclusive Or)
The ^ operator is used to perform a bitwise exclusive OR on two expressions.
Syntax
^
~ (Not)
The ~ (Not) operator is used to perform a one’s complement of an expression.
Syntax
~
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