You may have seen this CPU module with a PAL in games like Wonderboy or Sega Ninja. As some of the Sega System 1 games were encrypted and bootleggers made CPUs to decrypt them.
Unfortunately, two of the components used in these modules are hard to find now, and they are (quite) large. I researched decryption methods and made a new replacement with modern small components. I used a flash ROM as a decryption table storage, and reconstructed known...
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Source: https://www.arcade-projects.com/threads ... ent.27406/