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Here’s my card with that switch desoldered for comparison. The via indicated with an arrow seems to go to the shared pad between R229 and R230. Even without removing my heatsink you can just see how my resistors are set up.

Does anyone have a high-res photo or scan of the underside of the MDD board (166MHz, FW400)?

I figure I should check to see if my flyback is arcing as well…

A lot has been done on these forums but there are still many projects left for the taking, which is a good thing. You could be that talented member!

Just pick off or cut the green stuff (as you did) and the tan stuff. The blue and brown wires will need to be desoldered from the PCB unfortunately.

That would suggest there is some other difference between a stock 133 and stock 166 board. Perhaps there is another option resistor that needs to be set (voltage?), or maybe the bill of materials is different and there is a chip inline with the memory controller that's rated to a slower speed.

I've installed a Dual 1GHz CPU in my MDD (formerly Dual 867), and bumped the bus speed to 166MHz by removing R676 on the underside of the logic board. However, it now has RAM-related issues with stability that it didn't have before. Depending on configuration, it either fails to boot or kernels...

I’m not sure if the soft power circuit will function without caps, so you might not get it to start. You could always try booting it and see. I’d probably try to be patient and just wait for the caps to arrive though.

Recapping it is probably the next job, then you’ll know if it’s the video card at fault or not.

Gary Davidian - the guy who wrote the 68k emulator :)

Great, because it’s a bit tricky to get a good connection on the SOP-44 zero insertion force adapter that goes into the T48.

Question for the hive mind then, is there one?

Have some of the through hole parts been reflowed? The PDS connector & VRAM sockets look a bit odd.

Have attached the ROM here. I hope that my T48 read both chips properly. Can you check if it's valid? Edit: I just compared the MD5 checksum using openssl md5 in Terminal. The outputted checksum is the same as that listed in the Google Doc linked previously so that's promising.

Would the upgrade have actually been a 6200 board? (As opposed to a LCPDS 601 card) The only issue with running 6360/6400/6500 etc boards in a 630 chassis is the lack of 3.3V from the PSU. A 6300 or 6320 board would drop into a 630/6200 with no problem.

I don’t think so, certainly not on a classic Mac. Maybe you could do it on a modern Mac but then it likely wouldn’t be readable on a classic Mac.

Is this a front end/GUI based on the diagnostics mode that was previously known about and more recently popularized by Adrian Black? Cause that would be pretty cool if so. @Burgertrench the readme says that it supports the LCIII?

Yes, I have. It’s not that useful - it claimed I had a failed ASC when I had a failed VIA.

Thanks, much appreciated.

So the artificial firmware limit to USB 1.1 speeds doesn't apply to other operating systems, interesting. This suggests a patch to enable 2.0 speeds could come in the form of either a firmware mod (similar to downgrading to the FW400 firmware) or a Mac OS mod.