The EMULEX UC07 SCSI Adapter manual (
http://www.bitsavers.org/pdf/emulex/UC0751001-F_UC07_Feb90.pdf) says:
"Ultrix-11 V3.0 and above"

Ulli

Am Mi., 18. Okt. 2023 um 16:32 Uhr schrieb Paul Koning via cctalk <
cctalk@classiccmp.org>:

>
>
> > On Oct 18, 2023, at 10:20 AM, Henry Bent via cctalk <
> cctalk@classiccmp.org> wrote:
> >
> > On Wed, 18 Oct 2023 at 10:16, Bill Gunshannon via cctalk <
> > cctalk@classiccmp.org> wrote:
> >
> >>
> >>
> >> On 10/18/2023 10:00 AM, Henry Bent via cctalk wrote:
> >>> On Wed, 18 Oct 2023 at 09:56, hupfadekroua via cctalk <
> >> cctalk@classiccmp.org>
> >>> wrote:
> >>>
> >>>> Hello all,
> >>>>
> >>>> does someone have a SCSI disc image of Ultrix 11 for a QBus based
> >> (11/73)
> >>>> PDP11.
> >>>>
> >>>
> >>> Ultrix-11 doesn't support SCSI disks, as far as I am aware.  What
> >> hardware
> >>> are you trying to use?  In any case, you can easily use SIMH to install
> >> 3.1
> >>> (or your preferred version) and then transfer that to real hardware.
> >>
> >> PDP-11 SCSI Modules emulate MSCP and RA disks and work fine with
> >> Ultrix-11.
> >>
> >
> > Interesting.  My Dilog DQ614 (ST506 emulating RL02s) specifically does
> not
> > work with Ultrix, but does work with 2.xBSD and v7, so I would not
> > necessarily assume that a third-party board was going to work with
> > Ultrix-11's drivers.
>
> There are two possible issues.  One is that SCSI is a packet oriented
> storage command/response system similar to MSCP but different.  So the kind
> of controllers Bill mentioned are essentiallly translators between the two
> protocols.
>
> If what you have is a native SCSI controller -- one that exposes the
> actual SCSI commands -- then that requires an entirely different driver
> because that isn't MSCP.
>
> If you have an MSCP translator type controller, but the translation is
> poorly done, you might end up with it failing for some operating systems.
> That's not too unlikely given that the MSCP spec was for a long time a DEC
> confidential document, so third parties had to reverse engineer things (and
> dodge DEC lawyers).
>
>         paul
>
>

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