[Simh] PDP-10 simulator with DMR/KDP support?

[Larry Baker]

On 7 Jun 2013, at 2:58 PM, <simh-request at trailing-edge.com> <simh-request at trailing-edge.com> wrote:

> ------------------------------
> 
> Message: 2
> Date: Fri, 07 Jun 2013 17:58:40 -0400
> From: Timothe Litt <litt at ieee.org>
> To: Mark Pizzolato - Info Comm <Mark at infocomm.com>,
> 	"simh at trailing-edge.com" <simh at trailing-edge.com>
> Subject: Re: [Simh] PDP-10 simulator with DMR/KDP support?
> Message-ID: <51B25790.50804 at ieee.org>
> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
> 
>>> I  don't think the DUP11 was ever a supported device on VMS.
> 
> Yes, it was.  See http://h71000.www7.hp.com/doc/spddecnetplusvax73.pdf 
> page 13 table 2.  DUP wasn't added in 7.3;  it would have been there all 
> along.  This was just the first SPD I grabbed.  There were also sync 
> line adapters for Microvax - I have one here, I think.  DSW4{1,2,3}.  
> And QBus (DPV/DSV, BI (DMB/DSB).  Gory details in the SPD.
> 
> You needed the WAN Drivers layered product, though.
>> The DUP11 is supported on a VAXBI system fitted
>> with a DWBUA UNIBUS adapter for VAX 8200, VAX
>> 8250, VAX 8300, VAX 8300, VAX 8350, VAX 8500,
>> VAX 8530, VAX 8550, VAX 8700, and VAX 8800 systems only
> 
> (Oddly, I didn't see DMC/DMR listed, but I do remember them working...)
> 

We ran DMRs between our VAX-11/780 and PDP-11/70 RSX-11M-Plus -- predating DECnet Phase IV.  (Wasn't Phase IV the first release that supported Ethernet?)  I remember doing poor-man's routing from the VAX through the 11/70 to an LSI-11/23 in a lab (over a DZ-11 async serial line!).

My recollection is that DECnet always used DDCMP over serial lines.  I thought the DMR did the DDCMP protocol in hardware.  Maybe DMZ's too?

> Yes, Phase V supported DDCMP as a transport layer.  No version change.

Larry Baker
US Geological Survey
650-329-5608
baker at usgs.gov

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