Doom works fine on the new eloader using 2.01 FW. Just get this version of the emu:
http://dl.qj.net/index.php/pg/12/fid...=636&catid=195

Goto the FW15 dir and copy the doom folder to your PSP game folder. Stick a doom wad in the wads folder. Shareware will do. And load through fanjitas eloader. Loaded first time for me, no probs!. Full sound, and runs beautifully!