[Simh] EXT : VAXstation 4000 Model 60

[Mark Pizzolato]

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".  

Actually, the lack of guarantee would certainly be true for VMS systems 
that only could have a single file system on a particular drive, but Ultrix
systems should be able to have an a partition that was sufficiently small to 
guarantee the ability to boot.

- Mark