Is there a list maintained somewhere of the ATX power supplies that can be used as a suitable replacement for the original ones?  I have an Amiga 4000 and a 3000 and a 2000.  They still have their original power supplies and I am hesitant to turn them on after all I have read online.  Also I recently purchased a BigRAMPlus card and my Amiga 4000 which seems to work fine otherwise could not even see it.  I am wondering if the power supply may be too weak to power the Zorro slots.  The thought of turning on my Amiga one day and having the power supply fry the motherboard give me the willies!
 
I have looked at the replacements Ive seen online from a few years back but those appear to be generally out of stock. 

Perhaps a very clear set of ... understandable ... guidelines as to how to to one.  I can identify the necessary current levels, but how would I know if a PSU regulates voltages based on the 12V or 3.3V usage and not the 5V?  Or has a fan that does not operate continuously? Or simply will not fit?

Or is there an Amiga vendor somewhere who maintains a stock of suitable replacements for the A4000, etc?

A sticky on this subject would be nice.

I have bought a Fastlane Z3 SCSI2 adapter, and I'm trying to use it with an Amiga 4000.
So far, its not quite working, its still quite a ways off from being of any use.
It was bought as not known working, because the vendor said they had not used it in 5 years.
But, last time they had, they said it was fully functional.

So, the situation…
When I plug in a serial connection into my BlueSCSIv2, and turn it on, it appears to be functioning as expected.
Further to this, I have already used THIS BSv2 with a GVP SCSI sidecar and it was working as expected.
So, I think its assembly is ok.

In the Z3 card, it sees the BSv2, as ID0 or whatever you configure it as, and you can select it, and try to configure it.
I have done this with both HDTools using z3scsi.device and also with its own native toolset from Phase 5 (unitControl2 and SCSIControl3).

Both tools see the drive. However, it is a little unreliable. For instance, when reading its details in HDToolbox, it sometimes reads the manufacturer information verbatim, but sometimes its characters are garbled, same goes for drive name, and version.

When I partition the drive, this works ok. However, post that, quitting the tool, the drive is not always mounted and shown on the desktop. Mostly, it is not, about 90% of the time, it does not appear, even after a reboot.

When it DOES appear, you can select it, and then format the drive, and this appears to work as expected. It's name changes, and you can open the disk, and it reports the correct size. However, when you try to write ANYTHING to it, it reports checksum errors, and data, never seems to stick, no files appear on the disk.

When using the unitControl2  tool to set the drives properties, it also sometimes reports a checksum error. Also, on occasion it will state that the drive's size is not divisible by the number of cylinders (or similar)

I am not sure if this is a hardware problem with the Z3. Oddly, in the the BSv2 serial logging, everything looks ok.
Or, is this a configuration/software problem, something needed somewhere with MASK values, sector values etc.

If anyone here also has a Fastlane Z3 that would be especially useful. Sadly, I do not have a REAL SCSI hard disk to test with. I'm not into using them as they are so unreliable now.

I may start, as a simple precaution to replace the cards caps. There are only 3, but who knows, maybe the power delivery is a bit off or dirty. I guess there could be an issue with the cards chips, which are mostly GALS or PALS (heat-sinks on all) but as it kind of works, I don't think it this. Usually ROM corruption or chip fails lead to more drastically bad behaviour.

Anyway, those are my thoughts on it right now. All help appreciated.