More on the porting tip with M@x and Sleepper… Get PSPKVM and enable MIDP/JavaME on your PlayStation Portable. The PSPKVM project is a port of SUN’s phoneMEFeature. And so you really know what’s up, I’m going to paste you the complete feature list:

• Emulator of real devices
  pspkvm is not just a JavaME implementation, it also emulate various real phone devices in term of screen size, key codes etc.. For example, when you choose to emulate “Nokia N73″, that means the screen size and key code values will be same as the real N73 phone, some games may rely on these values to run correctly.
• User defined key layout
  Default key layout may not suitable for every games, so user defined key layout is available for each game.
• Install application via HTTP
  The phoneMEFeature default installation mechanism is remained, you can find and install jad/jar files from web.
• One-click install & run jad/jar from memory stick
  User can select jad/jar files from memory stick and run it like previous pspkvm, and actually its installed automatically when you first time to run. After that user can select from Application Manager to run, configure and remove the installed application.
• MVM support
  MVM (Multiple Virtual Machine) feature gives the ability to run several MIDlets at the same time. For example: user can run Messenger in background to chat while gaming, or browse web via opera-mini while running Google Maps.
• Nokia UI support
  Since so many games require Nokia UI, pspkvm provides a well optimized, native based implementation of this set of APIs. Currently, however, not ALL Nokia APIs are supported, but still meets the requirement of most games

Now if you’re interested the change log for PSPKVM v0.5.2 follows…

Download:
PSPKVM 0.5.2 (fw 1.50)
PSPKVM 0.5.2 (cfw)

- source: pspkvm