I think I've tried everybody's suggestions about sequence, value, timing, etc. None of them work. The machine gets locked up, or 95 kills the DOS task, or 95 gives a blue screen exception report. I can't believe it's that tough! And going back to the first interrupt controller only isn't a very feasible option. Come on, guys! I'm counting on you... Thanks! Andy ================================================================== Andy Kunz - Montana Design - http://www.users.fast.net/~montana ==================================================================