not necessary FPGA but can be re-writable: see
I am not good in that hardware emu branch but my guess is that they pick something that can drive and matches original clock speed as the old programmable rom was no longer produced. (the antique people would buy old broken ones and rip parts off them or try to restore them.)
From look at the board, basically it looks like they did the “hardware” emu approach. But people I know that enjoy retro stuff they either want the look(original or replica case/keyboard, but internal is more modern that runs software emu) or they want the antique(functional original). It’s pretty rare to see these kinda of hardware emu where they bundle chips as close to old ones while trying to replicate how the old hardware work and then drive with another modern board for the input/output.
Metroid’s signature feature, basically any enemy/breakable gives you something once you gain more type that needs ammo stock.
Is there a list of more popular decentralized platform and their equivalent?
Reddit -> lemmy
Twitter -> Mastodon
FB -> ??
Discord -> ??