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