On 2020-03-27 16:47, Robert Armstrong wrote:
   Paul Koning
<paulkoning at comcast.net> wrote:
 As a Phase III node it would be DDCMP only ...
 I don't remember if it supports any synchronous interfaces ... 
 
    There are no device drivers included with RT11 for anything that I
 recognize as a synchronous interface, so I would assume it only supported a
 standard asynchronous serial port. 
 
That don't necessarily mean much. With RSX, DECnet has its own device 
drivers.
     But that's another curious thing - there ARE
drivers included with RT11
 for the DEUNA, DEQNA and the Pro series Ethernet NI.  What was the point of
 those?  Did DEC think people would write their own networking software? 
Yes, I believe so. That is also the case for the Unibus ethernet in RSX, 
for which there is also a device driver provided in RSX itself. (If you 
use DECnet, it does not use that device driver.)
Megan Gentry wrote a file transfer program under RT-11 which 
communicates over ethernet. Should not be too hard to find, and is an 
example of a normal user level program using these device drivers.
   Johnny
-- 
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