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IRPC             Assemble Once for Each Character              MASM Directive

  IRPC dummyname,string
  statements
  ENDM

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

       Notes:     Dummyname may be used any number of times within
                  statements.

                  The string can consist of letters, digit, and other
                  characters.  If string contains spaces, commas, or other
                  separating characters, enclose it within angle brackets.