There is nothing too unique about the
ROM-inator II Carbon (4MB) relative to the "Atom" (2MB) that came before it, or even the earlier versions that were offered in 2MB, 4MB and even 8MB sizes. Other companies make custom ROM SIMMs too, and I made
this video showing all of them. They all behave the same way in an SE/30, with slightly differences depending on what you flash to them. So if the ROM-inator II Carbon is out of stock or otherwise impossible to buy and you want a ROM SIMM now, you need only buy a ROM SIMM from another company who makes them, and again, my video covers that, as does the video description.
I have a Daystar CPU-socketed
PowerCache in my SE/30 with the PowerCentral Control Panel too, and it runs perfectly fine with the ROM-inator II and any of the third party version custom ROM SIMMs too -- no hacks or special ROM flashing required. Why Steve C. says "PowerCache" is incompatible is unknown, unless he is referring to the
PDS slot edition PowerCache, which I do not have nor have I ever tested it. When using the word "PowerCache" it's best to clarify if one means PDS or CPU-socketed version.
Even the Daystar Turbo040 (which I own as well), does in fact work with the ROM-inator II and all third party ROM SIMM variants if and only if you flash the "olePigeon ROM for DayStar Turbo040":
https://tinyurl.com/mrssv23v
Turbo040 & olePigeon ROM CAVEATS: HD20 drives (even on a FloppyEMU) won't boot an SE/30 anymore and 1.44MB floppies don't work. If you do NOT use the Turbo040 and flash a regular ROM file to your ROM SIMM, you CAN boot an HD20 and you CAN use 1.44MB floppies.
I also have a DiiMO PDS slot accelerator (50MHz 030) in my SE/30 and it works fine with all custom ROM SIMMs, even with the DiiMO Control Panel loaded.
If you want to run System 7.5.5, you have to patch the System file, and that patching is most easily done with this neat app on Macintosh Garden:
A utility for applying arbitrary small resource patches, with instructions explaining how a savvy user can create his or her own. The default patch enables an SE/30 to run System 7.5.x or 7.6.x with a 32-bit clean ROM from a IIsi or IIfx, and a few others are also included.
macintoshgarden.org
No such patching required for System 7.1 or earlier.
That and so much more can be found in the text description under my ROM SIMM video on YouTube. It's absolutely packed with all the info I researched on the subject, and pulled from my first-hand experience.
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