On Mon, 30 Oct 2023 at 11:43, Henry Bent <henry.r.b...@gmail.com> wrote:
> On Sun, 29 Oct 2023 at 13:00, hupfadekroua via cctalk <
> cctalk@classiccmp.org> wrote:
>
>> Hi all,
>>
>> I tried several ways to get a working SCSI image to be successfully boote
>> on a ZULU 2024 SCSI Emulator.
>>
>> 1. I do have an Image of an RZ25-E drive containing RSX11M Plus, which is
>> booting properly. This is a raw dd based disc image of a SCSI drive.
>> 2. I got a disc mage by Jacob, which is booting using simh, but not using
>> the ZULU on a physical 11/73
>> 3. I created a fresh installation of Ultrix 11 using simh 3.9.x creating a
>> RD54 image which won't boot on the ZULU an the physical 11/73
>> 4.. I created a fresh installation of Ultrix 11 using simh 3.9.x directly
>> into a physical SCSI drive partition, created an image via dd which
>> doesn't
>> want to boot on the ZULU. Simh is booting properly from a dd image of this
>> partition.
>> 5. Simh is telling me in general using a (virtual) RQDX3 controller. Maybe
>> the images created won't boot because of being created by the virtual RQDX
>> 3 controller?
>>
>> How to create a raw disc w/o any controller specific format - simply a
>> plain Ultrix 11 image as a target for a SCSI drive to be booted either
>> from
>> the physical, or from a virtual (ZULU).
>>
>>
> Newer versions of SIMH (v4, I'm not sure exactly when support was added)
> allow you to "set rq type=RQDX1" which in the case of the RD54 might make a
> difference, and the Ultrix-11 ra driver does treat the controllers slightly
> differently.  I'm not sure that it should actually make a difference, but
> that would be the first thing that I would try.
>
> How does the controller identify itself when booting RSX-11?  That could
> give some hints as to what might be happening with Ultrix.
>
> You could also try 2.11BSD, or even 2.9BSD, to see if those are able to
> boot and see how they identify the controller.
>

Replying to myself here...

I took a deeper dive through the Dilog SQ706A controller manual (the SCSI
controller you're using) and it looks like it presents itself as a KDA50,
though that's only an inference based on the fact that the manual suggests
that you can run the KDA50 diagnostics on the controller.  Ultrix-11
definitely treats this differently than the RQDX series, so perhaps that's
the issue here.  I went ahead and set up an Ultrix install on an RA81/KDA50
in SIMH that uses the disk sensibly since I wanted that for my own use,
contact me off-list and I can send you the image.

-Henry

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