Is the code for this open? Curious to have a peek and a poke...

https://github.com/floooh/chips-test/blob/sokol-app/examples...

The pure 8-bit chip emulators are here:

https://github.com/floooh/chips

You can also start with the 'proper' emulator this is based on:

https://github.com/floooh/yakc

This has all the links to the underlying software.