This could be old news or my mind fuckin with me, but it seems that Doom Legacy works online with the Prometheus thing if you know how to install it right. It doesn't come up as "Doom Legacy" on the server when you go to http://www.prometheus.uk.to/status/
to check and see what people are playing it comes up as "ULUS40037" instead cause I guess the name probably isn't in their system and may not have been tested either but I tested it and it at least seems to connect. So with that said, anybody that likes Doom Legacy for PSP and wants to play hit me up on here so I can kill you or test games that aren't already on the compatability list just to get something a little productive done and maybe encourage people to do cool shit with thier PSP's and use them to their full potential and play games that were never even available for online before such as this one. Hopefully the PSV will have something like this in the future.