[Simh] VAX 780 emulation - How to install Netbsd

[Mark Pizzolato - Info Comm]

On Sunday, December 28, 2014 at 10:06 AM, Johnny Billquist wrote:
> On 2014-12-28 18:59, Mark Pizzolato - Info Comm wrote:
> > On Sunday, December 28, 2014 at 9:48 AM, Johnny Billquist wrote:
> >> Also, if booting older machines using VMB, you need to know the magic
> >> bits of R5, since it requires the same treatment as Ultrix. R5=0 will
> >> not boot NetBSD (or Ultrix).
> >
> > With the latest simh version (and the VMB.EXE it contains) an R5=0 boot
> will work fine for both NetBSD and Ultrix on all the older VAX models.
> 
> Yes. (But I prefer posting information that works right both in simh and on
> real hardware, when possible...)

True.  However, if someone tried to boot real hardware using the simh supplied VMB.EXE it would work just as it does in the simulation and not need any bits set in R5, although setting bit 3 (R5=8) will also work.

- Mark