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Amazing work, thank you for sharing! The amount of detail is prey impressive.

How hard would it be to port the sound as well?

Good question. The sound is a hardware component (synth circuit) that I haven't looked into much, because it's essentially outside the game code.

si78c is faithfully sending all the right bits to the right port, but the hardware component would have to be emulated to get it going.

The relevant code could most likely be borrowed from MAME.

Probably this and the corresponding cpp file:

Emulates the TI SN76477 sound chip.