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Insert coin, press button 1 3 times, and button 2 once, then press start
I believe all MARP inps are with normal 1-50 stages, since under normal circumstances game ends at 50.
So unless there's a non-conventional way to play from 1 to 100 within a single credit this may be worth a split or a dual credit, where you play the extra stages if you beat 50th stage.