Based on what I'm seeing from reviews and people's comments. It looks like this is using some form of retroarch. Definitely using altira BIOS for 5200 games which makes me think it is using a5200 (comes with altirra bios) and not atari800.
Likely mane2003. Also if it recognizes the "samples" folder for arcade games chances are it recognizes other mame folders like "cfg" and "nvram".
Also likely using prosystem for a7800 emulation and stella 2013 for atari 2600 emulation. Depending on how current the retroarch is on it. It might be able to play ricki & vicki.
Two questions.
Has anyone tried connecting a keyboard to see if it is recognized?
Does the arcade version of Tempest included support the paddle controller?