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CROSS ASSEMBLER->Assembler Source Code Format->Operation Field

If a label is present then the assembler assumes that the field following the label is the operation field.  The operation field must be separated from the label by one or more spaces.

If no label is present then the operation field must be preceded at the start of the line by at least one space.

The operation code may be a microprocessor executable instruction (opcode mnemonic), an assembler directive (pseudo-op) or a macro instruction.

Opcode mnemonics and directives are case insensitive and lower and upper case characters can be freely intermixed.  Macro names are however case sensitive.