Can't AUX?
I think your problem may well be using IRQ 2. On an XT, IRQ 2 is OK to use,
but on any more recent computer, IRQ two is used to access interrupts 9 and
up. Having the SB on that interrupt can cause unexpected, and potentially
unpleasant, surprises.
Ron (not with Microsoft) Wodaski
author of Multimedia Madness
Read action !go amigav