One of the common myths of the networking world is there were no “real” networks before the early days of packet-based networks. As myths go, this is not even a very good myth; the world had very large-scale voice and data networks long before distributed routing, before packet-based switching, and before any of the packet protocols such as IP. I participated in replacing a large scale voice and data network, including hundreds of inverse multiplexers that tied a personnel system together in the middle of the 1980’s. I also installed hundreds of terminal emulation cards in Zenith Z100 and Z150 systems in the same time frame to allow these computers to connect to mainframes and newer minicomputers on the campus.

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