@mitu
Awesome!
Perhaps it's an incompatibility issue related with Ubuntu x64 19.04, will try experiment a bit more, but I'm glad at least it works on the RPi, hopefully someday this code will be added into retropie script since the upstream version has a higher games compatibility than old stella 2014

@BuZz
Is it possible to add this core to retropie?
https://github.com/stella-emu/stella/tree/master/src/libretro

It's the upstream stella, but I am not sure how to compile it as libretro core... so I do not know I it's compatible with arm architecture.

unfortunately that doesn't seem to work. I need the input to recognize GPIO rather than the controller button.

Let me explain a little better...
I am using a Super Video Arcade machine as the case for my retropie set up. The goal of the project, like many have done, was to use the original on/off switch and reset button for all emulators.

So to do that, I have 1 GPIO input setup for the keyboard letter 'r' which I used as reset in my jzintv keyboard hack. It works great. So the Intellivision emulator acts completely like a real Intellivision complete with reset and on/off switch. I still have the keypad programmed for exit and all that, but I use the 'reset' button just for the sake of nostalgia.

So I'd like to do the same with all other emulators using the 'reset' button as the input for each emulator... I just can't get it to work.

Thanks.