[MelkorsGreatestHits] had an extra USB MAME board burning a ... for this far-out Kerbal Space Program controller. Cool your jets — no fully-functioning TI-99/4As were harmed in the making ...
One possible way to do so is suggested by [Doctor Volt] in a video where a Samsung Galaxy S4 is combined with a USB-connected FT232R board to add external GPIO. The idea is pretty simple ...