I previously tried to get Retroarch to run scaled up PS1 games on my Mac. I've given up on it.   I learned about Duckstation (builds for Android, Libretro, Linux, Mac, and Windows) a few weeks ago. Tried it out but it crashed a lot, even locked up my Mac mini a number of times requiring me to hold down the power button to restart it. There was also a strange grid pattern overlaid on top of the image.   I installed the latest build this weekend and it's working much better - i