I have UNEPROM boards at the very least, but I'd assume i have others. Some have multiple revisions, as well.
Oddest one i have off the top pf my head for the NES is an Atari (note, not Tengen) dev board. I have probably a dozen or so that are unpopulated as well, I'll see what i can dig out tomorrow.
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Hi, my name is Mark, and I collect (and now sell!) Prototypes.