Pin-based emulation (research)

[ddrcode]

Experiment with "pin-based emulation". In such emulation the connectivity between components mimics physicial connections of electronic components and interaction happens via pins/ports. With such type of emulation it should be possible to design custom machines easily, and avoid programming model where one component "owns" another. See whether such approach is feasible and performant enough.

• Figure out convenient way of implementing pins, ports and connectivity between them,
• Find out how to make signal on pin activate certain functionality of a component (ideally without callback pattern),
• As an POC, implement a simple 6502 machine with pin-based approach (Ben Eater computer seem to be a good example)
• Compare performance of pin-based emulation with the current approach