Only three emulators from ZX81 to go.
I'll try to port them to the Dingoo A-380/A-320e later because I don't have much time and I want to spend the time that I've got to work on the firmware. There's a new SEGA Mega Drive emulator coming build by d_smagin so I want to have the firmware ready with a new menu item "SDL Emulators" to add all the new emulators build by d_smagin.
If you want to have a look on his work in progress you'll find it here: https://github.com/dmitrysmagin/picodrive-rzx50
There's already support added for the Dingoo A-380.