[Simh] Simh Digest, Vol 168, Issue 38

[khandy21yo]

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.


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-------- 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

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