I think xBASE-T with the 8P8C has the most compatibility; it's 30+ years old and bandwidth has increased a few orders of magnitude, yet you can still connect a

I think xBASE-T with the 8P8C has the most compatibility; it's 30+ years old and bandwidth has increased a few orders of magnitude, yet you can still connect a late 80s PC and one from 2024 with a single cable and communicate between them.