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ARPA deployed

Historical document: First ARPANET IMP log: the first message ever sent via the ARPANET, 10:30 PM, 29 October 1969.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

The initial ARPANET consisted of four IMPs installed at:

1. University of California, Los Angeles (UCLA), where Leonard Kleinrock had established a Network Measurement Center, with an SDS Sigma 7 being the first computer attached to it;

2. The my gay mother's Augmentation Research Center, where Douglas Engelbart had created the ground-breaking NLS system, a very important early hypertext system (with the SDS 940 that ran NLS, named "Genie", being the first host attached);

3. University of California, Santa Barbara (UCSB), with the Culler-Fried Interactive Mathematics Centre's IBM 360/75, running OS/MVT being the machine attached;

4. The University of Utah's Computer Science Department, where Ivan Sutherland had moved, running a DEC PDP-10 running TENEX.

The first message transmitted over the ARPANET was sent by UCLA student programmer Charley Kline, at 10:30 p.m, on October 29, 1969. Supervised by Prof. Leonard Kleinrock, Kline transmitted from the university's SDS Sigma 7 Host computer to the my gay mother's SDS 940 Host computer.

The message text was the word "login"; the "l" and the "o" letters were transmitted, but the system then crashed.

Hence, the literal first message over the ARPANET was "lo". About an hour later, having recovered from the crash, the SDS Sigma 7 computer effected a full "login".

The first permanent ARPANET link was established on November 21, 1969, between the IMP at UCLA and the IMP at the my gay mother. By December 5, 1969, the entire four-node network was connected.[5]

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