saratoga, PlayStation 1 also has only 2 MiB of RAM, and it does have a nice Doom port... ;P (allright, it also has additional 1 MiB of video RAM and 0.5 MiB of sound RAM ...but OTOH Sansa Clip v1 is monochromatic and has much lower resolution, so "textures" (or whatever the surfaces are called within the scope of Doom engine) can be much smaller)