The macroinstructions are coded in the same format as assembler instructions, using name, operation, and operand fields.

• The optional 1–8 character name field provides a label for the macroinstruction. If you use a name, it must begin in column 1 and be followed by at least one blank.
• The operation identifier (such as ACB or SEND) begins in column 10 and must be followed by at least one blank.
• Operands can occupy columns 16 through 71 and must be separated by commas. The last operand on a line must be followed by at least one blank. If the operands require more than one line, you must place a non-blank continuation character in column 72.

Each macroinstruction has its own section that contains a brief description of its function and use. The remainder of each section contains:

• A syntax diagram
• An operand-by-operand description
• Examples (if applicable)
• A summary of status information.