> > > I'm using the standard Motorola terms. > > > > So where did the 192 come from? > > The m68k has 192 user defined interrupt vectors (0x40-0xff), although not > all of them are used. For some reason 192 doesn't work - the interrupt count is unsigned int so there should not be a sign problem. Either way, setting the count to NUM_ATARI_SOURCES is perhaps what we really want here. Michael