alcinnz, I've made a final couple adjustments to my hypothetical hardware-Internet Communicator hypothetical before publishing it.
I put in an extra sentence that I can't expect my hypothetical hardware to prefetch all memory, I'd need a fallback strategy.
And prompted by @gabrielesvelto 's thread ( https://fosstodon.org/@gabrielesvelto/112407741329145666 ), I put a few sentences in regarding error detection/correction. I've just located a bunch of links (Ben Eater & eBlue1Brown) to fill that paragraph.