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CROSS ASSEMBLER->Assembler Source Code Format->Operand Field
The operand field follows the operation field separated by one or more spaces. Whether or not an operand is required will depend upon the particular operation specified.
The characters of the operand field must not be separated by any spaces since these indicate the end of the operand field. There are two exceptions to this rule. The first is with macro arguments where a space can be included within an argument providing the argument is enclosed within brackets. The other is with the TTL directive when spaces are allowed in the operand (but in this case no comment field is allowed).