[Simh] Simh Digest, Vol 168, Issue 38

[Johnny Billquist]

It's not really a bug. It's a limitation. A bit unfortunate, but a design choice made by the proframmer who wrote the firmware.

  Johnny 


khandy21yo <khandy21yo at gmail.com> skrev: (26 januari 2018 03:35:24 CET)
>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

-- 
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