[Simh] EXT : VAXstation 4000 Model 60

[Bob Eager]

On Fri, 12 Jul 2019 11:59:49 -0700
Mark Pizzolato <Mark at infocomm.com> wrote:

> On Friday, July 12, 2019 at 11:27 AM, Johnny Billquist wrote:
> > As far as I am aware, it was only some models in the 3100 series
> > that used the shorter SCSI commands in the boot rom, which caused
> > issues with the boot disk. However, I'm not sure that exact thing
> > is the problem. You might very well have some display issues that
> > pop up in the boot monitor, even though the system will boot
> > perfectly fine from a larger disk.  
> 
> On the older VS3100 systems (without large disk boot support), things
> would boot fine on larger disks as long as the pieces of OS code that
> are loaded in the early stages of the boot all happen to be located
> early enough in the disk drive.  Since you can't guarantee that all
> the needed files would be located early in the drive large disks were
> "not bootable".  

I fixed this by making the disks artificially smaller (by changing the
firmware tables on the disk).