alt Hacker NewsYeah, it seems like more modern technology has settled on standard protocols (maybe a naive impression--someone will shout at me if that's the case) but there's probably a very long tail of bizarre false starts if you want full coverage of models back to the early 90s when computers became more commonplace.
After 2006/2007 nearly everyone did CAN. I think that is even mandatory in the US, though I have no clue how to look that up (I assume there are details and exceptions) However before then everyone did their own thing. Often with custom chips that haven't been made since 2004 (or even 1999): good luck finding one that works if it breaks. CAN is cheap and allows a lot of power while hiding most of the protocol complexity. The things before that were often not as powerful as CAN, while being in practice a lot more complex because the complexity wasn't hidden.