[Info-vax] Reading Gordon Bell's VAX strategy document

[Lars Brinkhoff]

Johnny Billquist wrote:
> There were of course development, and testing done between machines
> and so on. But that was not "ARPANET". ARPANET was running NCP until
> flag day, when it officially switched to IP.

NCP and TCP operated in parallel on the ARPANET for a while.  The
Internet Protocol Transition Workbook from November 1981 encouraged new
hosts to only implement TCP, not NCP, and says at that point there were
TCP-only hosts.  On several occasions during 1982, NCP was temporarily
blocked, but TCP was allowed.  What happened on flag day was that NCP
was permanently blocked.

So what I was wondering was: were there any VAXen talking NCP, or did
they jump straight to TCP?  I'd like to see evidence, not handwaving.