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E Q U ----Equal Symbolic Value
Format is
label EQU expression
where label is a symbol the value of which will be deter
mined from the expression, and expression is an expression
which when evaluated will be assigned t o t h e symbol given
in the name field.
D S ----Define Storage
Format is
label DS expression.
The DS causes the assembler to advance the Assembly Program
Counter, effectively skipping past a given number of memory
b yt es .
D B ----Define Byte
Format is
label DB expression.
This pseudo-op is used to reserve one byte of storage.
content of the byte is specified in the argument field.
D W ----Define Word
This pseudo-op is used to define two bytes of storage.
evaluated argument will be placed in the two bytes; high
order 8 bits in the low order b y t e , and the low order 8 bits
in the high order byte.
for two byte addresses.
Assembler Errors * V
The following error flags are output on the assembler list
ing when the error occurs.
put during pass 1.
0
L
D
M
V
U
S
R
A
This conforms to the Intel format
Some of the errors are only out
Opcode Error
Label Error
Duplicate Label Error
Missing Label Error
Value Error
Undefined Symbol
Snytax Error
Register Error
Argument Error.
Self-Contained System
Assembler
Revision 2
The
The
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