[Simh] EXT :Re: PDP-10 simulation: DEUNA support help needed

[Timothe Litt]

On 27-Apr-15 14:56, Cory Smelosky wrote:
> On Mon, 27 Apr 2015, Timothe Litt wrote:
>
>> One clue: iprout.mac references an IP address owned by the Royal
>> Institute of Technology in Sweden.
>>
>
> ...This is getting absurd.  Just how many stacks exist?!
>
That I know of?  For IP?
DEC had a TOPS-20 TCP/IP stack.  Many of the upper level protocols were
first implemented on t20/tenex, including smtp, ftp, telnet,
time/daytime,tftp, dns.
BBN had a TENEX stack.  Not sure if DEC's started with it.
USC/ISI had a KA on the ARPANET; not sure what stack.
I believe ITS and WAITS both had TCP stacks; they certainly had NCP (the
TCP predecessor, not the DECnet)

Speaking of NCP,
http://www.computerhistory.org/internet_history/full_size_images/1971_net_map.gif
shows 25 ARPAnet nodes in 1971, of which 9 are PDP-10s.  There are 15 by
1973
(http://www.computerhistory.org/internet_history/full_size_images/1973_net_map.gif) 


There was at least one other university-created stack for TOPS-10; I
want to say UW, but I'm not sure.  Since DEC never built one (even
internally), the customers were on their own.  It may have been the
'tops-20 differentiator & the future' politics.  I wasn't involved.  I
know there were a bunch of student project partially done attempts
floating around the customer base.  Usually customers converged on one
codebase, but just what happened with TCP/IP on the -10 wasn't on my
RADAR. It was too early for the commercial customers to care, so it was
a small population of researchers and academics...

Then there's the stack just posted - it is clearly incomplete.

Interfaces: The AN10 for the KA/KI/KL (it lived on the IO Bus, so on the
KL used the DIA20).  The AN22 for the KS.  These provided the 1822
interface to the IMPs.   I know some folks used SLIP on serial lines. 
Of course once the KL got the KLNIA, ethernet was the way to go. 
Cheaper, faster - and by then, the IMP was gone.

I'm probably missing some, but then I really don't have time to ponder
this right now.

>> I don't have time to dig into it any further.
>>
>> This communication may not represent my employer's views,
>> if any, on the matters discussed.
>>
>


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