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Expressions
An expression is a sequence of one or more symbols, constants
or other expressions separated by the arithmetic operators
plus or m i n u s .
Expressions are calculated using 16 bit arithmetic.
arithmetic is done modulo 65536.
contain a value greater than 255 or less than -256.
value outside this range will result in an assembler error.
Pseudo-Operations
The pseudo-operations are written as ordinary statements,
but they direct the assembler to perform certain functions
which do not always develop 8080 machine code.
ing section describes the pseudo-ops.
ORG----Set Program Origin
Format is
where the label is optional but if present will be equaled
to the given expression.
END----End of Assembly
The pseudo-op informs the assembler that the last source
statement has been read.
on pass 2 and terminate the assembly and pass control
back to the executive.
assembling from a memory file since the assembler will stop
when an end of file indicator has been reached.
12
14
P A M +3
I SA B - 1A'+52
LOOP+32H— 5
label ORG expression
The assembler will then start
This pseudo-op is not needed when
IMSAI 8080
Self-Contained System
Assembler
Revision 2
Single byte data cannot
The follow
All
Any
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