Syn-Z has updated what is now the best Genesis Emulator for the PSP (We need a new PSPGenesis release /me looks for Sougen), heres whats new via translation:
*Ver 1.20 (2005.12/01. ) Thanks to Smiths for the Excellent translation
+ Core Switches
- Switched 68K core to high-speed MUSASHI 3.3
- Switched Z80 Core
- High-speed 68K Core and Z80 Core appropriated from NeoCDPSP (thanks Yoyofr)
+ Added key config for core switching / reset