Gigatron Hackers

How should I compile ROMvX0, is there any one that has been compiled?

I will try and draw a simple circuit diagram.

Thank you for your hint, I prefer 8-bit or even higher-quality audio to 6-bit audio.
Regarding the hardware transformation of 8-bit audio, can you show me the schematic diagram? I am not very skilled in the circuit, but I would like to try it.

I want to know how to implement 6-bit audio, and what changes need to be made on the hardware? , I am very interested in it. Because I use gigatron as a retro music player, and I will write some music for gigatron.