Installed R23 from R7 (installed over, did not uninstall R7) and using zipped games only i can confirm the following:
snes-(was never meant to work with this emu, dont know where you got that idea)
master system-(tested only 1 rom, didnt work for me)(will retry)
genesis-(was never meant to work with this emu, dont know where you got that idea)
pce_tg16-works (tried tg-16 rom only, not a cdrom based game)
also ran these from internal hard drive, not a usb drive.
ok also got sms to work. test out fantasy zone (world) if you want to try it out for yourself. seems compability is low at the moment so it doesnt matter if its zipped or not. zip files work perfectly fine.