It’s been awhile but Notaz is back with a new version of PicoDrive, the Genesis/Sega CD emulator for PSP. This is mainly a bugfix release, so don’t expect any speed improvements.
Changes:

Fixed sprite masking code. Thanks to Lordus for explaining how it works.
Added “disable sprite limit” option.
Added black level adjustment to display options.
Changed reset to act […]

Enjoy countless hours of Genesis/Sega CD games on your PSP with notaz’s PicoDrive — the Genesis/Sega CD emulator for PSP.
v1.35b Changes:

mp3 code should no longer fail on 1.5 firmware.
added gamma adjustment option.
added .cso ISO format support. Useful for non-FMV games.
it is now possile to force a region after the ROM is loaded.
fixed a sram bug […]