Call opcodes and updated encoder

Hello.. love this project. I was sort of obsessed today with trying to create a function to output text.. which I think might not be possible, but it seems like at least I can make a function for outputting a character at a time.
But looking at the code, seems that call is not implemented.
Also would you consider updating the encoder for the new version?
I understand if you have other obligations. Just wanted to mention my interest in the continued work.