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Got a retroid pocket 3+ and quite enjoying it
(hexbear.net)
Although every review or video that mentions it can run ps2 and gamecube. It can't. Also aethersx2 has been abandoned and is closed source. Also android sucks.
But so far its a really nice ps1 portable device. Usually I'd use my vita but I'm always worried about damaging it and they're not exactly in production so I wanted something more disposable with L2 and R2 buttons. Now i can play Abe's Odyssey/Exodus on the train :D
Before I forget, here's a repo of every game ever made(not really but it's a ton): https://r-roms.github.io/
I have 2 other repos somewhere with more currated collections for up to N64 iirc but I'd have to find them. I just have the above bookmarked.
Also LPT: replace the stock sd card that these things come with if you can. They tend to crap out all the time.