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

[Johnny Billquist]

I haven't looked, but I thought the DN20 also ran RSX-20F.

I looked over RSX-20F a few years ago, and it's sortof a mix between 
RSX-11D and unmapped RSX-11M. Rather weird beast actually.

One of our -2060 at the University had (well, still have) an extra 
cabinet with a Unibus expansion and more terminal lines. Extra DH-11s, 
but no extra PDP-11s. All still running through the FE PDP-11.

   Johnny

On 2019-12-21 04:55, Thomas DeBellis wrote:
> 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?

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol