I think the whole concept of deriving the number of controllers based on
units in simh is wrong.
I think one should configure each controller separately, including being
able to tell what CSR and vector it has, and how many units should be
connected one way or another, and any other relevant information. For
serial ports, that obviously means that you might connect one line to a
physical line, another to a telnet listener, and another one not
connected to anything at all. And exactly how many units/lines the
controller have should also be a factor here then.
This also comes back to disks, where I might not want to configure four
disks on one controller, but maybe one controller per disk.
The list goes on...
On 2018-04-09 20:47, Mark Pizzolato wrote:
This is indeed true. The problem comes from the fact that the single
PDP11 simulator can simulate different PDP11 models some of which are
Unibus while others are Qbus systems. On the various VAX simulators,
each simulator only simulates either a Unibus or a Qbus machine and thus
things are simpler to align and thus things appear as you would expect.
Feel free not to use the extra ports that are provided free of charge. J
Seriously, I’ll look into addressing this. The number of DZ11/DZV11
devices that are simulated is derived from the number of lines which are
configured. A problem arises when the CPU type changes between a Unibus
and Qbus types. What should happen when an odd number of DZV11’s are
configured and the CPU type is changed from a Qbus type to a Unibus type?
*From:* Simh [mailto:simh-boun...@trailing-edge.com] *On Behalf Of
*Sent:* Monday, April 9, 2018 7:35 AM
*Subject:* [Simh] DZ11 vs DZV/DZQ11
It appears that if you want to simulate a DZV or DZQ11 on a QBUS
PDP11, then you have to use the UNIBUS DZ11 instead. That’s OK, except
that a DZ11 has 8 lines per card where as the DZV and DZQ are only 4
lines per card. Simh won’t let you say “SET DZ LINES=4”. This is
something of an issue because I want to set up my simh environment to
exactly mimic my real hardware, and it appears that’s not possible as
far as the DZ goes.
Or am I missing something??
BTW, it’s funny that “HELP DZ” in simh talks exclusively about the
DZV11 and even says things like
… The DZV11 is a 8 line terminal multiplexor. …
That’s totally wrong…
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