[ih] NCP, TCP/IP question

[John Day]

The early Illinois NCPs (for ANTS) were written in PEESPOL, PDP-11 Espol. The language created Dave Grothe based on Burros ESPOL, their operating system language which was a derivative of Algol.

The first UNIX NCP (1975) was written in C for the Illinois PDP-11/45, all of the TCPs (for PDP-11/45, 70, and VAX) were in C.

There is a paper from 1972 by Metcalfe on writing NCPs. I will have to find it and see what language that was.

Take care,
John


> On Mar 10, 2020, at 05:33, vinton cerf via Internet-history <internet-history at elists.isoc.org> wrote:
> 
> 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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