[ih] Cisco origins (Was: when did APRANET -TIPs become known as -TACs)

[Greg Skinner]

On Sep 29, 2025, at 3:42 PM, Bill Nowicki via Internet-history <internet-history at elists.isoc.org> wrote:
> 
> Hello Noel et al. Yes indeed, I was in the midst of the Stanford v. Sun v. Cisco mix.  From the start of the Stanford University Network (SUN, the acronym not the star) project, the justification for Andy Bechtolsheim's hardware was to use off-the-shelf parts for a modular design as much as possible. I drew some of the diagrams for the ARPA proposal in 1979. We could take his CPU, frame buffer, and Ethernet cards to make a workstation, but that was thought to be only for the elite users. For normal people, we would get a CPU board and a couple serial line cards to connect terminals. I wrote a very quick and simple program (stand alone on raw hardware) some wag called an "Ether-TIP" because it would perform a similar function as the TCP TIPs (erstwhile TACs when they used ArpaNet only protocols, maybe). Another function was putting two or more Ethernet cards into a bus with a CPU and calling it a gateway (or "rooter" if you from Canada, eh?). Indeed, both my simple multi-user Telnet program (which I called MUT as apropos) and the original routing code done by Bill Yeager in the medical center used PUP initially. Ironically, the Stanford University Medical Experiments on Artificial Intelligence for Medicine (SUMEX-AIM) funding Bill Yeager's work sounds like the hype cycle exploding right now. Since Yeager added Telnet to his code, it made mine obsolete. His could do PUP as well as IP routing, and at Stanford we used PUP networks to be IP subnets.
> However, 1822 IMP interfaces were not so much commodity items. Luckily, Jeff Mogul had been an undergrad at MIT, and Vaugh Pratt (now faculty emeritus) had been teaching at MIT. MIT had a PDP-11 router developed already, and we were tracking Dave Clark's work. So Noel kindly did a custom build for us (called the "Golden" gate which became the IP gateway to campus for other than the AI like KL10 and the TOPS-20 systems which had their own direct host connections. It was in the basement of Margare Jacks Hall, the first time that the actual Computer Science Department, in the school of Humanities and Science in 1979, had equipment in the same building as professors.
> My wife worked at one of those AI companies that was going to set the world on fire in 1980. She thought it was funny that her terminal connection said "Welcome to SU-Net" which was the exact same prompt with capitalization and punctuation that Bill Yeager used in his code, but the box was labeled "Cisco Systems". Supposedly Len Bosack re-layed-out a board but the hardware was effectively Andy's, since it had been designed when Len was Director of Computer Facilities for SU CSD. Very soon after the AI startup ran through its money and went out of business. I did hear that fairly quickly Kirk Lougheed and others at Cisco rewrote the code and made it even more of a Swiss army knife, doing all sorts of function on all sorts of network stacks.
> Also probably while collecting Stanford salary, Len designed his own first real hardware, which was a MASSBUS adapter to connect KL10 and TOPS-20 machines to Ethernet, as I recall. It worked out for Stanford since the MASSBUS Ethernet was really needed, but a niche market. Then Stanford got a nice discount too. Yeager just recorded an oral history at the computer history museum, and I had lunch with him a couple weeks ago, still the same with fun stories.
> Would be happy to give more details if someone cares.
> Bill N.

Regarding the MASSBUS adapter, references 18-20 on a Cisco product list Wikipedia page point to additional information. [1]

[1] https://en.wikipedia.org/wiki/List_of_Cisco_products

Greg