I have installed pico 8 with picopi on a raspberry pi zero and it runs really nicely, but I can't seem to get a zero delay usb joystick interface to work with it.
It sees a playstation classic (the mini) usb ok and also a generic nes usb controller.

If all else fails, I could just use the nes pcb and pad hack to the joystick box I'm making.
It would be far neater to use the Zero Delay - or, better still - the gpio pins, but I think you need an operating system to access those?

This may help

https://www.lexaloffle.com/bbs/?tid=38841

That is WAY beyond my understanding. I'll just use the compatible NES pcb and pad hack it to my controls. Thanks anyway.

lol did you read the whole thread, the second post by me is so easy to do and literally step by step, I got my pi zero controls running off gpio pins

I'm not using an OS. I'm using PICOPi with pico-8 as a stand alone. It boots in about 8 seconds and obviously doesn't have any linux (as such) on there.