I'm trying to use a real KoalaPad as an input device for Altirra through an original AtariAge/pixelspast Stelladaptor. I can get the buttons to work (mapping to gamepad buttons 1 and 2) but can't find the right input mappings for the tablet part which according to the documentation should read as PADDLE(0) and PADDLE(1). I have tried all the Joystick 1-4 V and H mappings as well as the POV joystick but always get 228 as an output and no response on any touches to the KoalaPad.
It should basically connect the same way as standard Atari paddles. I have tried the settings from this thread but to no avail (output 228 for both paddles).
(KoalaPad is verified to work on real hardware.)