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Excellent, thank you!

These are PCI Power Macs, they do not have NuBus slots (and a Radius Rocket would be comically underpowered compared even to the stock single CPU 604 and 604e cards these machines shipped with).

I believe any 604/604e dual processor CPU card should work. The PowerCenter and PowerCenter Pro are quite forgiving.

Per the ANS 500 developers' guide, ROM should be addressable in that range. I don't know if the full firmware-assisted AIX sysdump will include it, though. Should be possible to dump ROM from OF in any case: 0 > 100000 0 do ffc00000 i 4 * + dup 3f and 0= if dup cr 8 u.r ." :" then @ 8 u.r...

Here's a ROM from a stock ANS, btw.

Wouldn't the ROM be present in the system dump in 0xFF000000 to 0xFFFFFFFF?

Could the ROM map be extracted from a complete dump, as triggered by AIX sysdumpstart ? https://aix4admins.blogspot.com/2011/06/aix-generates-system-dump-when-severe.html

Here's a photo of my friend's ANS ROM. These are the only identifying marks. He would be up for dumping the ROM if someone can come up with the AIX command(s) to do so.

I'll ask.

I've reached out to a friend who has an ANS, and he'll get me the ROM part number. I've also checked the 1066-page Module Identification Guide (and the European supplement) and it suggests that the ROM SIMM for the ANS 500/700 was not offered as a separate line item. Instead, the ROM SIMM was...

I haven't found any standalone G3 or G4 cards in that range (other than the Sonnet cards that don't work in the late PT Pro) that are affordable on my hobby budget. I have a couple of 400 MHz ZIF G3s and a 500 MHz ZIF G4. So those would seem to make sense. If they worked. I do have other...

Yep. Short reset, long reset, reset along with pulling PRAM battery and power, reset then wait overnight. No difference.

So, I installed a pin header at what would be Vpower for the missing regulator (confirmed it has continuity to the power pad on the CPU socket) and one of the ground plane test points, and I'm getting pretty clean 3.3V to the card. Hmmm.

Interesting that Interex didn't populate the space they left for a voltage regulator... I may solder on a header to Vpower here and see what the card is really getting.

I just checked the power supply again, all the rails seem good. 12V is reading a bit high (12.6) when under load, but that's within modern spec for ATX. I was thinking about that voltage regulator thing as well. It seems to be the biggest difference between the cards. Most of the Newer Tech...

I'm running the logic board horizontally, and have thoroughly cleaned everything I can clean, and braced the CPU cards with a clip I fabricated. I've tried ZIF CPUs from 233 MHz G3 through to 500 MHz G4. I also replaced the four SMD electrolytics on one of the ZIF Carrier boards, mostly...

No, I’m not skilled enough with such things to determine if the ROMs include FPU instructions (not even sure how to merge the ROM dumps, tbh), and I haven’t had the time to just solder on the FPU.

Success with the mini image on the previously discussed el cheapo 3112 card with the 12V ROM. Desoldered, flashed, resoldered, and I have a 256 GB SSD mounted in 9.1..! Huzzah. Shows up as an ATA drive to the system, but the card does not show up as an ATA host in System Profiler. Whatever, as...

Most welcome!

FUSE-HFS works properly in Monterey and Ventura, btw. I'm using it for most of my classic Mac image tasks now. Automatic mount arbitration and everything.