Since PSP has a 333mhz processor and a 480x272 pixel screen ... why don't we (hugh, ok, why don't YOU, my god-like favourite programmers 😅 ) put a DosBox release on this machine (since it has memory stick duo to 2Gos too) ?
DS sounds good to me but I don't know how it could work with a 33Mhz "only" processor and a lower resolution 256x192 (but 2 screens ...)

Anyway, playing my dos games with nice interface (joystick-like) on a portable machine is my dream since ... wow ... a while 😁 !