Interface Message Processor 1965 Bolt, Beranek and Newman, Inc., United States The Interface Message Processor (IMP) was the first packet router for the ARPANET, the predecessor of today’s Internet. Inside was a Honeywell 516 minicomputer with only 6,000 words of software to monitor network status and gather statistics. The first ARPANET transmission occurred between the University of California in Los Angeles and Stanford Research Institute in Menlo Park, California, at 22:30 PST on October 29, 1969. Memory Type: Core Speed: 520,833 Add/s Memory Size: 12K Cost: $82,200 Memory Width: (16-bit)