// Interesting... This (1/16) causes the machine to crash in the demo (if run from clean start, otherwise it FUs demo)!
// (1/32) fucks up the demo...
// (1/64) works. Weird!
+//1/64 no more... but 1/128, 1/32 and 1/16 don't work either!
//#define SG2_PIA_CALLBACK_DURATION ((FRAME_DURATION_IN_CYCLES * M6809_CYCLE_IN_USEC) / 16.0)
#define SG2_PIA_CALLBACK_DURATION ((FRAME_DURATION_IN_CYCLES * M6809_CYCLE_IN_USEC) / 64.0)