[Simh] EXT : VAXstation 4000 Model 60

[Johnny Billquist]

On 2019-07-12 23:36, Bob Eager wrote:
> 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).

But then I assume the disk appeared smaller also at later stages. 
Essentially you got yourself a smaller disk.

Or am I missing something?

   Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol