1      SEE DEMO                 invoke full screen editor to
                                    create DEMO.ALC 370 assembler
                                    source file.
    2      DEMO CSECT               first line - define section
    3           USING *,15          second     - define base register
    4           LA    2,=C'HELLO$'  third      - address of msg. text
    5           SVC   209           fourth     - request console msg.
    6           BR    14            fifth      - exit to MS-DOS
    7           END                 sixth      - end of program

    8                          enter escape key to save DEMO.ALC
                                    and exit to MS-DOS
    9      A370 DEMO/LX             assemble DEMO.ALC and create
                                    DEMO.OBJ object code file and
                                    DEMO.PRN listing with symbol
                                    cross reference.