Do you know what version of RetroArch its using..?
How is the Legend Flashback..? its looks like the Genesis Classic console from 2009.Its a bit odd having Genesis controller when it plays Arcade games. Properly that all they had copyright to at the time.
I remember using Picodrive for the first time on the PSP.. is the name Pico the name of the chip in the Mega Drive..?? like Lisa,Angus or AGA in Amiga.
No its cos of the Sega Pico that uses the hardware from the mega Drive.
This device uses a custom emulator, it's not RetroArch, but it works with RetroArch cores. Picodrive core is not optimized for this scenario. I was only able to fix the BIOS after copying the emulator to a Tinker Board running Linux and troubleshooting from there.
The Legends Flashback is almost the same device (minus cartridge slot, wireless controllers and only 128MB RAM / 128MB NAND). I used it to test most of the updates I've made since my Genesis Flashback freezes after 10 minutes playing. They have the same OS, and the only differences between them are the emulator and rom partitions, and the menu. The Legends Flashback menu loads the cores based on the file extension, so it has some 'slots' which gave me the opportunity to expand the FBA core to a full version (Atgames compiled the FBA and MAME cores only with the drivers they are actually using), and add a new core (MAME 2000). The emulator has the same issues as the Genesis emulator, PAL games have audio delay, and even some arcade games have some delay.
I've used Picodrive for the first time in a Symbian Device (likely the N-Gage) around 2003 or 2004. I don't know if the name comes from the Sega Pico, but it's possible.