I played doom on the geepee32 emu b4 i got a gp32 and i thought it was ok but then i saw it on the gp32 and it was perfect speed.
But i use the gp32 for dev purposes but he might want to see how doom looks on the gp32 playing it in a emu will give u a better idea than screenshots.
I mainly need a screenshot of the main menu. I can't get to that unfortunately. I have no need to play Doom on my comp, I have an actual copy of the collector's edition anyways.