Appendix D
The GDS assembler and linker
1 Format of the assembly source program
An assembler statement may have as many as four fields. The general format of a statement is:
The label and comment fields are optional. The operator field may be an assembler directive or an assembly mnemonic. Some operators do not require an operand, e.g. cpl.
1.1 Label field
If present, a label must be the first field in a source statement and must be terminated by a colon (:). Multiple labels may appear on successive lines. For example:
The legal characters ...
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