Lua is a port of a coding/script language over to the PSP. Changes:

IrDA support [Shine]

Windows Emulator [sweetlilmre]

sceIoD* functionality added for System.listDirectory().

sceGuClearColor and sceGuClear implemented.

flicker reduction via GL / PSP drawing sync

attempt to improve sound sync by yeilding in glutIdleFunc() func.

possible signed bug for timer fixed [Shine]

http://www.luaplayer.org/index.html