@muxelplexer @famfo @fossdd Not good at pre-RFC history of the internet but as far as I can tell DARPA was even older than that (I know there was UUCP and NCP).

And OSI (which is from ISO) would mean new protocols, and as far I can tell, it failed to actually get deployed outside of labs.

While TCP/IP managed to just encapsulate older protocols (as seen by it supporting the dinosaur that is FTP).