To run a CPS-3 setup with the UltraSIMMs you require two other pieces of hardware:
• A Working CPS-3 Motherboard (doesn’t matter what region, or game)
• A UltraBIOS cart. It's basically a regular cart that has the processor replaced with a regular SH2 and has the UltraBIOS in the flash (see attached). Reproduction carts have the right SH2, so you just need to write the new file to the BIOS.
The...
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Source: https://www.arcade-projects.com/threads ... imm.15229/