Update: For the 4-Player Xtension the IPAC2 runs players 1 and 3 (and left click) and the MiniPac runs players 2 and 4 (and right click and trackball). I tried both the new 1.50a firmware (on the IPAC2 only, it doesn't support MiniPac) and the 1.39 firmware on both the IPAC2 and MiniPAC and configuring as gamepads. Even though all the connections looks programmed properly, it was very inconsistent for what actually worked as a gamepad. It was about 40% working. I may have made some missteps. I have gone back to default for both IPAC2 and MiniPAC in my 4-Player Xtension. For others with the 4-Player Xtension who want to be able to get back to default configuration for the IPAC2 and MiniPAC, here are the files: https://drive.google.com/drive/folders/1qpPneE7E88_qc65JXOPq6gZYvpD1Ubki?usp=sharing

Hi Simonster, thanx for your response and sorry for my late reply. I picked up the project now and tried your command lines. I believe they are actually configured the same, but I do not think that is the problem. If I run the jstest /dev/input/js0, I just see multiple randome records on the screen being populated as if the buttons are pressed, but they are not. I removed every player2 connections, and only have the button 8 + gdn connected; now the cmd line still shows btn 8 and btn 7 being pushed eventhough I though nothing. I believe the xm10 panel must be faulty.... Sander

@pawpie when you set the overscan thing right there is 4 lines for setting the overscan for all 4 sides of the screen. You need to slowly increase/decrease the numbers until you get it perfect on your screen. For the ps3 controller you need to go into retropie setup and go into the drivers section and setup the ps3 controller in there.