I'm currently porting Stella 1.4.2, and the only remaining problem I have is with the sound output. From what I can gather, Stella outputs an unsigned 8-bit audio stream, but when the emulator is run it sounds incorrect (like the stream is played back at 16-bit resolution).
Does anyone know if the PSP port of SDL has full support for 8-bit audio formats?
From my understanding of SDL audio, the SDL audio driver is supposed to automatically convert 8-bit to 16-bit (at least it looks like that's what it's supposed to be doing). I can take another look at it.