sougen has released (PSP)Genesis v0.17, which is a Genesis/Megadrive emulator for the PSP. Changes in this release:

6 button joystick support

zip support (using Ruka’s unziplib)

fixed a bug in save states (current saves won’t work – if you really, really want your old save I could consider writing a converter… ).

user definable controls

optimized the sound code a bit (more games run faster now).

games list is now sorted

implemented new ui

user skins support for ui

return to current game support

frameskip options (note, if you have manual frameskip and the game cant keep up, the sound will obviously be jumpy if u dont have auto frameskip on)

vsync option

multiple save slots per game

experimental 50Hz conversion

added 266Mhz CPU speed setting

other miscellaneous fixes and features

http://www.dcemu.co.uk/vbulletin/showthread.php?p=41334#post41334