PDP-11: DR11-C to FPGA or 1284?

Jerry Weiss jsw at ieee.org
Tue Aug 1 19:27:55 CDT 2017

> On Aug 1, 2017, at 2:50 PM, Mattis Lind via cctalk <cctalk at classiccmp.org> wrote:
> 2017-07-31 21:05 GMT+02:00 Fritz Mueller via cctalk <cctalk at classiccmp.org>:
>>> On Jul 31, 2017, at 11:30 AM, Bill Gunshannon via cctalk <
>> cctalk at classiccmp.org> wrote:
>>> Well, I'm confused now.  What do 16 bit paralel and ethernet have to do
>> with each other?
>> Nothing, directly; confusion created by poor quoting on my part,
>> probably!  The goal is a higher-bandwidth and higher-convenience connection
>> between the PDP-11 and modern desktop compute.  So DR11 <-> Arduino <->
>> ethernet, as Jay has done, is one good approach.
> I guess that another solution is to put a DEUNA or DELUA on the Unibus and
> write some small piece of software that initializes it and send and
> receives datagrams directly from the PDP-11. The programming model doesn't
> look too difficult.

> On Aug 1, 2017, at 6:24 PM, Fritz Mueller via cctalk <cctalk at classiccmp.org> wrote:
> ...
> Mattis: I *do* have a DELUA, actually, but haven't slotted it yet to check it out.  Your suggestion would be to work up something simple at the link layer?  That might be worth a look, too...
>    --FritzM.

If you install the DELUA, don’t forget there is TCP/IP support for RT11 from 
Alan Baldwin at http://shop-pdp.net/rthtml/tcpip.htm <http://shop-pdp.net/rthtml/tcpip.htm>.    

If transfers between RT11 systems is possible and sufficient (ie:physcial to simh),  
check out Megan Gentry's RTEFTP package.  She did document
the protocol, but I am not aware of implementations on other platforms.


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