[ih] NCP, TCP/IP question

[vinton cerf]

TENEX was the prototype for TCP/IP for the DEC 10/20 systems and they were
prevalent well into the 1980s and perhaps beyond that.

v


On Tue, Mar 10, 2020 at 5:16 AM Steve Crocker via Internet-history <
internet-history at elists.isoc.org> wrote:

> Lars,
>
> Thanks.  For anyone who hasn't tracked PDP-10 operating systems, I believe
> TOPS-20 and Tenex were the same.  Tenex was developed at BBN.  DEC provided
> the TOPS-10 operating system but it was less capable than Tenex.  DEC
> acquired the rights to Tenex and brought it out as TOPS-20.  I don't know
> if there are substantive changes in the process; I have the impression
> there weren't.
>
> These systems were connected to the Arpanet when NCP was the host level
> protocol.  I didn't follow their history through the transition to TCP/IP,
> but I have the impression they continued to be commonplace on the Internet
> and thus would have had TCP/IP implementations.  Others can fill in the
> gaps here better than I can.
>
> Steve
>
>
> On Tue, Mar 10, 2020 at 5:08 AM Lars Brinkhoff <lars at nocrew.org> wrote:
>
> > Steve Crocker wrote:
> > > I don't think C was used or available on Tenex, but I'm not the most
> > > authoritative source.
> >
> > There were several PDP-10 C compilers, but I'm not sure whether one
> > actually ran on Tenex.  Some ran on TOPS-20, so it wouldn't have been a
> > big leap.
> >
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