Thanks for testing this again so quickly! This confirms that the Mac OS leaves the Q700’s $F29 register at 0 by default even though it doesn’t on the Q950. I have a feeling I might need to look at the $F09 register as well, at least on revision $B0. Maybe it’s the reason the IRQ is still firing even when I turn it off in $F29.
We are definitely seeing evidence of a repetitive EASC interrupt on the Q700 that doesn’t fire constantly, but does seem to keep going forever. But not on on the 950. Fascinating!
Maybe I need to print out all register values as part of the initial test. The Sound Manager must be setting up the 700’s EASC differently than the 950’s.
