Yes, you're right. Based on a previous message from "radius75" : "The game uses potX/Y for additional Fire on Joystick port 2. (Fire 2 = Jump/UP)" so, maybe this generate the signals on POT lines, that cause the character jump continuosly when SwinSID is present, even if the joystick ports are free, nothing connected to .
As you well know, today it's quite difficult to find the original MOS SIDs as spares, and many are using the SwinSID, but right now it's not compatible with "A Pig Quest".
Issue when audio chip SwinSID is present : Frank Further is jumping up continuosly without doing any action with the joystick.
I suppose this is probably caused by : "The game uses potX/Y for additional Fire on Joystick port 2. (Fire 2 = Jump/UP)" as the SwinSID doesn't have the joy ports X/Y active.
Is it possible to do a game version compatible with SwinSID, maybe removing the use of pot X/Y and the additional fire option ?
TESTS Done on following Hardware :
Commodore C64G - PCB Assy N. 250469 - Original Audio IC 8580R5 Replaced with SwinSID (Firmware 2014/10/19 Lazy_Fix)
Thank you for this Amazing Game ++++++++++++++++
Maurizio
