I don't think that this would work. Where would you put it? When I first started doing TSR's with interrupts, I used IM 2 because it was easier. It worked fine, but I realize now that several games (like Bomber Bloke) that use ram page 1 will crash with it installed :-( >you could also write your own im 2 which runs a loop with nops or halts, and >then finishes with rst 38h