[HECnet] DECnet/Python

[Paul Koning]

> On Oct 27, 2021, at 11:08 AM, Robert Armstrong <bob at jfcl.com> wrote:
> 
>> DDCMP over TCP or UDP is possible with PyDECnet ...
> 
>  DDCMP is possible directly in simh for at least PDP-11, KS10 and VAX, depending on the support of the OS for the emulated hardware.  

For SIMH there are two approaches to DDCMP: one is the use of a DDCMP engine that's emulated, which in SIMH means DMC/DMR, DMP/DMV, or KMC-DUP pair.  Those are available in PDP-11, PDP-10 (KS10) and VAX.

The other option is DDCMP over a serial link (terminal link).  That can run over TCP just as the emulated DDCMP coprocessors do (in fact, both use the "terminal mux" facility in SIMH).  So as far as the other end is concerned, these two choices are interchangeable and PyDECnet should talk to either.  To pick one example, DECnet-8 doesn't support coprocessors, but it works over serial lines; if you run that, assuming you can bring it up to Phase II, PyDECnet should talk to it.

	paul