[HECnet] Tops-20 ANONYMOUS FAL Preliminary Testing Results/DAP Query

[Thomas DeBellis]

Was 11/D what also ran in DN20's?  The DECSYSTEM-20 was actually a 
cluster of computers with the PDP-10 being connected to up to four 
11/40's (or 34?) via interfaces called DTE's.  The DN20 was a repackaged 
PDP-11 (34?) and they were incredibly useful.

CU20B, our largest system, had three such units:

 1. Front-end PDP-11, ran a variant of RSX called 20F and handled
    communications lines, unit record equipment and (I believe) the AN20
    ARPAnet IMP interface.
 2. DECnet DN20; we had lines to other 20's (KMC11's) before we got
    Ethernet, plus a line to a VAX and a DN200 RJE.
 3. DN65, used for IBM/HASP communications.  I had source to the DN65,
    but I can not remember for the life of me whether it was an RSX
    variant or custom code.  That's surprising because I had to make
    some modifications to have it talk with one of our 4341's.

I have heard a site (I believe it was Case Western) that had a fourth 
PDP-11 serving as a communications concentrator for more lines 
(DH11's).  One shudders to think of a 20 with that many users.  Things 
got pretty slow at 50 and once you got up to 70, it was time to find 
something else to do.

> ------------------------------------------------------------------------
> On 12/20/19 6:12 PM, John Forecast wrote:
> Yes, both DECnet-IAS and DECnet-11/D existed, I was the project lead for the initial phase II releases (I think there was an updated release later on).
> DECnet for RSX-11/D was also one of the initial phase I releases, I used it at a customer site in Sweden.
>
>    John.
>> ------------------------------------------------------------------------
>> On Dec 20, 2019, at 5:00 PM, Paul Koning <paulkoning at comcast.net> wrote:
>> Did that exist?  I'm fairly sure it did.  What about DECnet for RSX-11/D?  Not so sure about that one.
>>
>> 	paul
>>> ------------------------------------------------------------------------
>>> On Dec 20, 2019, at 3:46 PM, Lee Gleason <lee.gleason at comcast.net> wrote:
>>> If you run across anyone with DECET-IAS, please let me know...
>>>> ------------------------------------------------------------------------
>>>> On 2019-12-20 1:12 PM, Thomas DeBellis wrote:
>>>>
>>>> Do I have any volunteers who operate something besides VMS?  I'd be interested in RSX(+), IAS, RSTS and OS-8.  They never did DECnet on RT-11, did they?
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