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Preserve Your Games with the Open Source Cartridge Reader
(www.retronews.com)
Vintage gaming community.
Rules:
If you see these please report them.
And if you want to not bother with the systems you don't have I'd imagine that would make it simpler and cheaper too
Unfortunately not that much less expensive, each additional slot maybe adds $1-2.5 to the project. The screen, Arduino and pcb are the bulk of the cost.
Ah that's a shame, I guess the ones I've seen in the past must have been a bit simpler