The Android software being used is called tapDancer. It’s beautifully made and great fun to play with. There is quite a lot of trial and error with volume, loaders and games, but that’s retro computing! I’ve managed to get a fair few games to work and it’s superb.
Highly recommended! Thanks to @backintimelive for the tip off.
p.s. here’s a little bit of “Frankie Goes To Hollywood” loading music from the game of the same name loading on my C64.