[ih] NCP, TCP/IP question

David Walden dave.walden.family at gmail.com
Tue Mar 10 04:12:34 PDT 2020

Re TENEX and TOP-20

See http://tenex.opost.com

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

>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.
>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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>Internet-history at elists.isoc.org

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