PicoDrive is Sega Genesis/Mega Drive/Sega CD/Mega CD emulator for various ARM handhelds, currently in the hand of Notaz.

Changes:

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 in memhandlers (fixes Shining in the Darkness saves).
Added additional low volume levels for my late-night gaming sessions (in stereo mode only).
Added “fast forward” action in key config. Not recommended to use for Sega CD, may case problems there.
Some minor generic optimizations.
Patched some code which was crashing under PSP, but was working in GP2X/Giz (although it should have crashed there too).
Readme updated.
Some other small tweaks I forgot about.

http://notaz.gp2x.de/releases/PicoDrive/PicoDrive_135.zip
http://notaz.gp2x.de/releases/PicoDrive/PicoDrive_135src.tar.bz2

http://www.gp32x.com/board/index.php?act=ST&f=42&t=39633