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A Trivial Complete MIDAS Program.

This program stores, in each word of TABLE, the index of that word. Thus, the 0th word gets 0, the next gets 1, etc.
        TITLE   COUNT

A=1                             ;Define a name for an accumulator.

START:  MOVSI A,-100            ;initialize loop counter.
                                ;A contains -100,,0
LOOP:   HRRZM A,TABLE(A)        ;Use right half of A to index.
        AOBJN A,LOOP            ;Add 1 to both halves (-77,,1 -76,,2 etc.)
                                ;Jump if still negative.
        .VALUE                  ;Halt program.

TABLE:  BLOCK 100               ;Assemble space to fill up.

END START                       ;End the assembly.