IRPC             Assemble once for each character             Macro Directive

  IRPC dummy_argument, string
  macro_body
  ENDM

    Causes the assembler to assemble macro_body once for each character in
    string, replacing dummy_argument with the current character on each
    iteration.

    string can consist of letters, digit, and other characters. If string
    contains spaces, commas, or other separating characters, enclose it
    in angle brackets (< >).

    Example:    IRPC lucky,1379                 ; Equivalent to: DB 1
                  DB lucky                      ;                DB 3
                ENDM                            ;                DB 7
                                                ;                DB 9