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Miyoo teases their GBA SP inspired retro handheld
(midwest.social)
Rumor has it that it's an RK3566 powered device, so systems before PSP, DC, and N64 will work fine, but those three will be a mixed bag.
I always found the SP super uncomfortable to hold compared to the original GBA, it's made for kid-sized hands.
I have big hands and the SP is comfy to use, just need to rest your pinkies under the console