[Simh] Emul. DL-lines over Telnet for PDP11, but all char's are converted Upper Case

[Gregg C Levine]

Hello!
An interesting question. Also an interesting problem. 

According to my working knowledge of the PDP-11, it didn't start
understanding that there was an upper and a lower case of alphabetic
characters until the widespread use of VDT based hardware. Therefore some
operating systems were generated to only use uppercase characters. This is
because the teletypes used also only spoke uppercase characters. 

So unless your RSX system ran on an original system that had a VDT present
who had both sets available, you may be out of luck. The manual may not be
aware of this fact although we certainly are. I believe this is a feature,
and a dratted nuisance.

Next becomes the question, where did you find RSX11M+ 4.6?
--
Gregg C Levine hansolofalcon at worldnet.att.net
"The Force will be with you always." Obi-Wan Kenobi
  


> -----Original Message-----
> From: simh-bounces at trailing-edge.com
[mailto:simh-bounces at trailing-edge.com] On
> Behalf Of Göran Åhling
> Sent: Friday, February 29, 2008 3:11 AM
> To: simh at trailing-edge.com
> Subject: [Simh] Emul. DL-lines over Telnet for PDP11, but all char's are
converted Upper
> Case
> 
> In running SIMH PDP11, with RSX11M+ 4.6, attaching DL-lines using
> TCP/IP-telnet, I run into a problem of "character conversion".
> Whatever I write is converted into UpperCase. This seems to be according
> to the SIMH manual, that states 4 different modes available, with UC the
> default.
> 
> My problem is that the manual doesn´t state how to change mode, just
> that 4 different modes exist.
> 
> In SIMH i can do SHOW TTIX0:, SHOW TTIX1: etc, and I can do SET
> TTIX0:..., but when I try SET TTIX1:, the emulator replies with "DEVICE
> NOT PRESENT" (or anything close to that, I'm not sitting next to the
> system right now...) (Is this really a bug or a feature I have not fully
> understod ??)
> 
> I have made sure the OS (RSX) is set /LOWERCASE, which does the job on
> true HW.
> 
> I'm running the "latest" binaries for Win... available on a machiene
> running a fully updated Win XP.
> I have tried a couple of different terminal emulators (Putty is one of
> them) with the same problem, and running the same emulators towards
> other systems (for example VMS with TCP/IP) works fine. Working this
> target system using LAT from a emulated terminal connected to a VAX also
> works fine, thus I conclude the problem arises from SIMH, not from the
> terminal programs and not from the RSX.
> 
> The reasson for running DL's, as opposed to DHQ's or DZ's,  is that this
> SIMH has a true clone of a running, working system with 11/93-cpu, where
> the DL's are (on the CPU board). I don´t want the "clone" to be
> differently SYSGEN'ed than the true HW version...
> 
> Any suggestion apprecieated!
> /Göran
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