[Simh] Simh Digest, Vol 168, Issue 38

[Bob Eager]

I know I've hacked larger SCSI disks in the past, for the 3100. I made
them report a smaller size so that they would boot.

On Thu, 25 Jan 2018 19:35:24 -0700
khandy21yo <khandy21yo at gmail.com> wrote:

> The MicroVAX 3100 had a bug in the boot Rom that limited it to a
> 1.06? Disk. I don't know if it also occurred on other systems.
> 
> 
> Sent from my Galaxy Tab® A
> -------- Original message --------From: Larry Baker <baker at usgs.gov>
> Date: 1/25/18  7:17 PM  (GMT-07:00) To: healyzh at avanthar.com Cc: SIMH
> <simh at trailing-edge.com> Subject: Re: [Simh] Simh Digest, Vol 168,
> Issue 38 We ran into this on a real VAX when we added a 20GB SCSI
> disk, as I recall.  Either VAX/VMS or the hardware (I think it was
> VAX/VMS) only looks at the low-order 24 bits of the disk size.  So,
> our 20GB disk was viewed as a 3+GB drive on the VAX.  Alpha/VMS has
> no problem handling larger drives.  I think I've used 100GB drives on
> an Alpha.  I know I have a 72GB and a 50GB drive on our Alpha now.
> 
> Larry Baker
> US Geological Survey
> 650-329-5608
> baker at usgs.gov
> 
> 
> 
> 
> 
> 
> On 25 Jan 2018, at 6:04:06 PM, simh-request at trailing-edge.com wrote:
> Message: 3
> Date: Thu, 25 Jan 2018 18:01:41 -0800
> From: Zane Healy <healyzh at avanthar.com>
> To: Dennis Boone <drb at msu.edu>
> Cc: simh <simh at trailing-edge.com>
> Subject: Re: [Simh] VAX Tape Emulation?
> Message-ID: <FB0095E0-4EC6-46CA-AEEB-52EEE315239E at avanthar.com>
> Content-Type: text/plain; charset=utf-8
> 
> 
> On Jan 25, 2018, at 2:22 PM, Dennis Boone <drb at msu.edu> wrote:
> 
> If you're venturing into unix technology, it's possible to mount nfs
> shares on the VMS machines.  Then you can use BACKUP to write save
> sets onto the nfs share.  There seems to be some care needed with ADF
> metadata.  Multinet seems to write this to a hidden file or
> subdirectory; not sure what UCX/TCPIP do.
> 
> I actually looked into this option around 2008 (for the same Alpha).
>  If I remember correctly I ran into a problem on the VMS side of the
> file size limit (I have the same disk size now I had in 2008).  This
> can work, but you have to break larger disks up into chunks.  I?m
> hoping to avoid that, with the solution I?m looking at.
> 
> Zane
>