PSP Dev Sunray from the QJ.NET Forums released a new version of the PSP Legacy Port, officially written by kgsws and Duke.

With the PSP Legacy Port you're able to play DOOM, DOOM 2, Final Doom and Heretic on your PSP.

Changelog (Release 4):

Quote:- Fixed auto map rendering. Toggle with START button. You can zoom in by holding TRIANGLE and zoom out by holding SQUARE.
- DOOM 1 - E3M1 no longer has clipped geometry and sprites in the beginning (bug in GU hardware renderer).
- DOOM 2 - MAP01 no longer has invisible walls and flats (BSP precision issue).
- Stick input is now analog and not digital. Added sensitivity controllers for both X and Y.
- Increased the number of sound channels from 16 to 24.
- Optimized sound mixing code.

Download

Source
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Doom Doom Doomy! W00t!

this is good stuff