[Simh] SIMH, PDP-11, RSTS/E and disconnection

[Johnny Eriksson]

> So I have a really nicely-running PDP-11 now with remote access via telnet
> through a DZ-11 device fully working.  I can log in remotely on up to 8
> simultaneous connections (only one DZ-11 set up for now) and have everybody
> working at the same time without a problem.  There is, however, the problem
> of hanging up.
> 
> I've attached the DZ-11 with the following command:
> 
> attach -am dz 6870
> 
> 
> Then I connect via:
> 
> telnet localhost 6870
> 
> 
> I then log in and kill my telnet connection entirely.  Just for good measure
> I kill the shell that spawned the telnet connection and double-check with ps
> that I've got no telnet sessions of any kind running.  When I switch over to
> the console and check, the logged-in user is still logged-in.  The missing
> telnet connection hasn't translated into any kind of hangup it seems.
>  Further, when I telnet back in I go straight into the logged-in user
> account.  I think the undesirability of this is understandable.  I've also
> tried attach plain, with -a, with -m as well as with -am as above without
> any changes in behaviour.  The system never seems to figure out that the
> connection has gone away.

Perhaps this is a stupid question, but does your RSTS treat these lines
as modem lines, or hardwired?  If the latter, RSTS will just ignore the
carrier drop that supposedly happens when you terminate your connection.

--Johnny