A3000D revision 8.9. buggy??? Fixes??

[redrumloa]

Hey Folks, I have an Amiga 3000D mb revision 8.9 with a problem. Everything works 100% so it seems, including many various Zorro II cards that have been tested in it. I think something has screwed up it's Zorro III support, as when trying to install a Prometheus problems occur. The card is recognised in early boot menu, PRMSCAN works and see the cards, but when trying to test a screenmode in Piccasso96Mode the system nukes and freezes up. I don't have any other Zorro III cards on hand to test.

The problem isn't the Prometheus. I've tested a few different ones to make sure. I've installed many Prometheus cards in A3000s over the years, I know the compatability. The Prometheus works with Buster-9, but this does happen to have a Buster-11. I suspect the Buster-11 is bad, failing that is rev8.9 known for any Zorro problems?

Ideas?

[redrumloa]

Ok I tried swapping Busters, no good as suspected. I hooked up a multimeter to watch voltages off the power supply and they stay stable @ 12.15V & 5.01V. I'm at a loss because everything else works rock solid.

No ideas?

[redrumloa]

I'd suggest the DMAC and Ramsey updates if are able to get them.

I was thinking about that. The Prometheus *should* work with the older DMAC and Ramsey, but maybe the tolerances in some manufacturing runs were poor? Oh well, i was just going to install a Prometheus for sale of it, i guess I'll just sell without.