Text taken from GP32emu:

Tom Forsyth updated his his GP32 port of Doom. Its been over a year since the last release and he has now released the source code in the hopes that someone will continue with the project. Changes in version 0.3 are: -Save/load do now work I believe.-First attempt at a sound libarary, but it doesn’t work and locks the machine. The FXE for version 0.3 hasnt been updated but I will look into compiling the new source code and release a FXE if all goes well. In the meantime head over to the homepage here for more information and the sourcecode downloads.

http://www.gp32emu.com