Nodes are stood up as BBN builds each IMP [Honeywell DDP-516 mini computer with 12K of memory]; AT&T provides 50kbps lines

Node 1: UCLA (30 August, hooked up 2 September)
Function: Network Measurement Center
System,OS: SDS SIGMA 7, SEX
Diagram of the first host to IMP connection

Node 2: Stanford Research Institute (SRI) (1 October)
Network Information Center (NIC)
SDS940/Genie
Doug Engelbart's project on "Augmentation of Human Intellect"

Node 3: University of California Santa Barbara (UCSB) (1 November)
Culler-Fried Interactive Mathematics
IBM 360/75, OS/MVT

Node 4: University of Utah (December)
Graphics
DEC PDP-10, Tenex

Diagram of the 4-node ARPAnet

First Request for Comment (RFC): " Host Software