This is hard, but perhaps even harder than you might think. I read an extremely long exploration of this concept a couple weeks ago. It's a layman explanation but it really does a great job of outlining the real complications of such a device. Here's the article: https://waitbutwhy.com/2017/04/neuralink.html One takeaway that gives you the sense of scale: there are at least 40,000 neurons in 1mm^3 of the cerebral cor…
Modern CPUs have on the order of 10 billion transistors and we have a pretty good idea of how those work. In my (uneducated) opinion, it feels like current tech must be close to providing the tools and scale necessary to start figuring this stuff out, no?
Semiconductors are really fairly simple in comparison.