Great board, this thing is a godsend for making repros as it lets you plug in test boards with ZIF sockets so you can quickly and easily test chips to see if they burned correctly or need to be re-burnt.
My only complaint is as follows: On the board the top cart slot is labeled "D" but the instructions for label "D" say "The LOWER cart connector (etc)" and the lower cart connector is labeled "B" and the instructions say "The UPPER cart connector". Obviously these are backwards and you should follow the printed instructions (upper connector label down, etc) - but you might want to rectify this before printing the next batch?
Also the instructions about the ICSP header jumper are unclear. Do I need to bridge that jumper whether or not a CIC chip is populated, or only if CIC is populated (aka Import Adapter mode, which I don't need/want for my purposes).
But again, otherwise a great board that fills a huge need in the repro/dev/import community for a very reasonable price.
Also only other downside is that it doesn't come with the 62-pin cart slot and you have to order those off Aliexpress, which is pretty much the only place you can find them for cheap unless you want to use an OEM SNES slot, but that's kind of overkill...
Straight to the point, I love the idea of a 27c322 adapter for your SNES donors. That way, you aren't spending a chunk of change for TSOP to DIP adapters, or using 3.3v flash chips. My biggest issue is the design. You have to do so much prep to get it to fit as low to the board as possible, and even then it will barely fit in a US cart. Personally, I would say it would be better to make the 27c322 side surface mount, instead of Through-Hole like the SNES Mask ROM side. But overall, love the idea but the design needs a bit more work.