Perhaps the DHV/DHU code has a solution that can be adapted, since it does seem
to cover the case.
paul
> On Apr 9, 2018, at 2:47 PM, Mark Pizzolato <[email protected]> wrote:
>
> Hmmm..
>
> 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:[email protected]
> <mailto:[email protected]>] On Behalf Of Robert Armstrong
> Sent: Monday, April 9, 2018 7:35 AM
> To: [email protected] <mailto:[email protected]>
> 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…
>
> Bob Armstrong
>
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