ARPANET

The Advanced Research Projects Agency Network (ARPANET) was an early packet switching network and was one of the first to use TCP/IP. It was made by the Advanced Research Projects Agency of the United States Department of Defense in 1969. It was the main network of a set that came to make up the global Internet.

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ARPANET Media

Arpanet logical map, march 1977
ARPANET access points in the 1970s
First ARPANET IMP log: the first message ever sent via the ARPANET, 10:30 pm PST on 29 October 1969 (6:30 UTC on 30 October 1969). This IMP Log excerpt, kept at UCLA, describes setting up a message transmission from the UCLA SDS Sigma 7 Host computer to the SRI SDS 940 Host computer.
map of the ARPANET 1973
Internetworking demonstration, linking the ARPANET, PRNET, and SATNET in 1977
ARPANET in a broader context