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I’ve got one I made and one original recapped. The recapped one was working fine for a while but then all of a sudden stopped working. I had resealed the plastic housing so need to open it at some point and see what happened inside.

Ah yeah, I'm seeing a steady ~5V coming from various points (connectors, psu, logic board, etc). I see the issue with additional 5V supplied or via termination power to ZuluSCSI. The power supply is fairly new (modern ATX) and is rated at 30A on the 5V rail. I have not measured the current but...

What do you mean by tapped? The power for the ZuluSCSI is coming off the 5V accessory connector on the power supply and last time I measured it was healthy.

Yeah, that seems difficult.

Yeah, was staring at my bench 540c and was thinking about how to save the floppy but with it in place, I don't think it will intake/exhaust correctly. I could do three holes (left exterior next to the hard disk bay and both sides of the CPU bay) and then out the floppy port. But before that, I...

Been playing with this a bit... I have three different CPU cards all of which have had CPU transplants. Card 1 - Full 040 with FPU (Freescale/L88M) without memory hack w/40MHz overclock - runs stable at 40MHz even after 3 consecutive runs of MacBench graphics tests, but no memory hack Card 2...

Yeah, my ZuluSCSIs always are powered via the floppy/berg connector. Didn't help me :( I got a working spinning disk from @techstep so when I get a chance, will test with a real drive to see if my issues are caused by the scsi emulation device.

I used JB Plastic Weld to get the overall shape. Then after it cured, grinded it closer to shape with a dremel and then it was sanding the rest of the way.

Not going to try since it’s working great. :)

I'd need to get a oscillator. My other PB 540c with full 040 at 40MHz can keep running the MacBench pro tests and continues doing fine after many runs. I think you mentioned before you think it might be the memory IC that allows some to overclock and some to not be able to? I think I'll keep...

Haha... will get it. It died after two runs of MacBench 3.0 graphics tests. :) Looks like it's going back to stock speed.

Ran into a slight problem with the memory hack - the Viking card I have has a different layout. But it's working now. Overclock (40MHz), full 040 with FPU, and now 48MB of memory. Thanks to @croissantking! You can see @croissantking's full instructions (super easy to follow) here...

Viking card.. different layout. 1st and 3rd columns go together, and 2nd and 4th columns go together.

I had bought one of those smaller handheld rotary tools (Fanttek F2) and used the smallest grinding bit and just went super slow. After I got about half a millimeter, I went for it and it took many attempts but finally got a bodge wire to hold tight. That was really painful.

That was really painful but yes, that CPU is repaired. Had to cut away part of the exterior to get enough of the pin to solder onto. It's working, has the FPU, and I've overclocked it to 40 MHz and it's stable. Now for your memory hack..

Hmmm...

Argh.. image corrupted again. I've about exhausted the easy debugging... only thing easy left to try is a non emulated SCSI (ie. real disk). If that doesn't help, I'd have to start attempting repros while watching various signals, and not sure I have time or the patience for that. :) Actually...

Still doing ok. Hopefully stays that way.

Bravo!!! 👏 Awesome result!! :) I usually use painters tape over the little icons to avoid filler getting in there.

Yup, what @croissantking said. My bricks are two PSUs in one.. the battery side limited to 1A.