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What's the barrier to getting the chip decapped and scanned at the needed resolution?

Really, just someone with the skill and interest in doing it. Money's no issue unless they want something crazy like $10,000+.

John D McMaster seems to have previously done 100x scans for some chips if I'm reading the site right e.g. the latest has a link for 20x and 100x https://siliconpr0n.org/map/generalplus/gplb52a24a-049a/. Is it as simple as seeing if he'll rescan the PPUs at 100x or are these not the quality that I was thinking?

He has a tremendous backlog of work to do at the moment.

I would prefer to not bother him unless it was a last resort, but that is indeed an option if my breadboard idea does not work out and no others are up to the task of decapping the PPUs.

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