[Simh] Booting the vax750 simulator.

[Henry Bent]

The /730 was configured with 5 MB, a UDA50, a DZ11, and a DEUNA.  It
suffers from the same kernel issue described above for the /750, so I
really haven't done any significant testing at all other than confirming
that the system comes up to multiuser and I can run basic commands.

-Henry

On 23 June 2015 at 22:21, Ethan Dicks <ethan.dicks at gmail.com> wrote:

> On Tue, Jun 23, 2015 at 7:06 PM, Henry Bent <hbent at oberlin.edu> wrote:
> > Out of curiosity I tried Ultrix 4.3 and 4.5 on the /750, both with
> genvmunix
> > and a custom kernel, and both showed the problem.  Whatever the issue
> here
> > is, it appears to never have been fixed.  I tried disabling just about
> every
> > device I could save for the disk, and I still got a panic every time.
> The
> > only thing I haven't yet tried is using a different disk controller (than
> > the UDA50).
>
> Definitely try a different disk.  UNIX device drivers do not use the
> hardware the same way that VMS drivers do.  I helped debug the Simh
> RP03 driver long ago because it wouldn't fully boot 2.9BSD (long story
> short is that it was because the BSD driver wrote to a read-only
> register to initiate an interrupt for device probing).  I've also run
> into issues with 4.3BSD not booting an 11/730 with RB80 (I did narrow
> it down to specific lines of code in the rb.c driver but haven't
> figured out what's not happening right.  It's *very* early in the boot
> sequence that things go off the rails, so it wasn't too hard to trace
> in the code).
>
> > Interestingly, Ultrix 4.0 will boot on a /730 if you make a custom kernel
> > (genvmunix is too big).  I didint' try 4.3 or 4.5.
>
> Huh.  I haven't tried that.  Interesting.  Which disk?  UDA50 or the
> IDC + RB80?  (DU driver vs DQ driver in VMS terms)
>
> -ethan
>
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