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Heh I toy around with a lot of retro networking/telecom stuff. Mostly ISDN and X.25, but a little Frame Relay and I’ve also considered purchasing some equipment to toy with ATM. I find it more interesting than the IP monoculture we have now.

I learned about bothTCP/IP and ARM in university, and my take-away was that ARM was specifically for phone calls, not data. Maybe that perception held it back.

Or maybe TCP/IP was simply too entrenched. Even IPv6 has been unable to replace IPv4.

It doesn't seem like TCP/IP is ever going to die. The closest standard to killing it was OSI.

Around 1990, OSI looked to be winning, TCP/IP was a workstation-only thing.