[Simh] Now some DZ/terminal questions

[Clem Cole]

Warren,

We can take this offline.   The quick answer is as far as simh is concerned
leave everything as 8 bits.
I'll show you how to make the rest work properly.  The logins will run 8
bits also, but will run with parity enabled which BSD will handle just
peachy.

Also, as I mentioned independently, I very much recommend not using DZs,
but using DH's.   Most BSD UNIX boxes ran with Able DHDM's because there
were both higher performant and cheaper than 2 DZ-11 (the cost of single
Able unit got you 16 ports, compared to 8 from DEC, plus they worked
better).  The DZ were originally developed by DEC as a cost reduced
terminal interface to the original DH11 - which was a full system unit on
the Unibus and the DM11 (modem control was an option).  So they took of a
lot of space/power etc.

Unfortunately the DZ were CPU hog's (see one of Bill Joy's notes circa
1979-80 - which I probably have somewhere) and sadly the DZ's did not
support full modem control (which was always a SW nightmare).  I would
later get to know some of the folks that made those choices from DEC's HW
team (they originally screwed up the original MC-500 serial boards also but
that's another story).

Anyway, int he late 1970's Able's Ken O cloned/enhanced the DH and DM into
a single hex board and since the UNIX community was often university folk,
driven by cost (and the DHDM [Able's product] plus did flow control in HW)
they were the gold standard for UUCP, particularly with Trailblazer et al.


As I said, we can take this off line, and I'll help you.

Clem

On Thu, Mar 9, 2017 at 7:03 AM, Warren Toomey <wkt at tuhs.org> wrote:

> Hi all, thanks for your help with my earlier questions.
>
> I'd like to set up several vax780 instances and run uucp (over TCP)
> between them using one or more of the simulated DZ lines. But I want to
> use the remaining DZ lines for logins.
>
> Is there a way to set some DZ lines into 8-bit mode but keep the
> other DZ lines in 7-bit mode? Only the uucp lines need to be 8-bit,
> the normal login lines can be 7-bit.
>
> Is there a way to set bind some (but not all) DZ lines to localhost port X,
> and some (but not all) DZ lines to any address port Y (or X, doesn't
> matter)?
> I want to make the uucp DZ TCP ports visible on the Internet, but set the
> normal login ports visible only to localhost.
>
> Many thanks, Warren
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