On Fri, 20 Oct 2023 at 13:28, Ethan Dicks via cctalk <cctalk@classiccmp.org>
wrote:

> On Wed, Oct 18, 2023 at 10:21 AM Henry Bent via cctalk
> <cctalk@classiccmp.org> wrote:
> > 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.
>
> I do not know what drives Ultrix-11 supports but it wouldn't be
> shocking to find that you can't use an RL02 as the root install
> device.  An RL02 was only big enough for the base install of 2.9BSD
> and not big enough for base+sources so I was never able to rebuild my
> kernel (it all worked fine on an RK07 at work).
>

I have a SIMH installation of Ultrix-11 3.1 on RL02 drives.  Two RL02s is
enough for a base system and four (which would be what the DQ614 provides,
if it worked) would be more than enough for sources and work, etc.  The
Ultrix-11 RL driver does fancy things with overlapped seeks that I'm sure
works on real hardware but on the DQ614, not so much.

-Henry

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