Do you know the direction where i have to put the files? I dont see any executable file. I cant find any PicoDrive-folder under /RetroPie/emulators just under /RetroPie/emulatorcores and i tried different folders there but it doesnt work.
By the way i manged it to get PicoDrive running fullscreen but i dont know how, which is always the problem when you constantly playing arround with different config-files.
Now i would like to use PicoDrive for my Master System Roms too but i also dont get it to fullscreen, the black border is even bigger as with Mega Drive before and its somehow streched to widescreen. Changing the runcommand in es_system.cfg doesnt help here as it normally does.