Operation entry
The operation entry is the symbolic operation code specifying the
machine, assembler, or macro instruction operation. The following rules apply to the operation
entry:
- An operation entry is mandatory, and it must appear on the same line as any name entry.
- For machine and assembler instructions, it must be a valid symbol at assembly time (after
substitution for variable symbols, if specified), consisting of 63 or fewer alphanumeric characters,
the first which must be alphabetic. Most common standard symbolic operation
codes are five characters or fewer. For a description of machine instructions, refer to the z/Architecture® Principles of Operation information.
For a summary of assembler instructions, see Assembler instructions.
The standard set of codes can be changed by OPSYN instructions (see OPSYN instruction).
- For macro instructions, the operation entry can be any valid symbol.
- An operation entry cannot be continued on the next statement.