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

[Wilm Boerhout]

Johnny Eriksson mentioned  on 18-4-2010 16:59:
>> 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
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>    
The RSTS monitor needs dataset support for the DZ11 built into it. There 
is a question in the INSTAL dialog that reads:

Dataset support for DZ11/DZV11/DZQ11's ? [N]

with "No" being the default, I suspect it then just ignores all modem 
signals and treats the ports as hardwired as you say.

The OP needs to recreate his monitor.

/Wilm