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 <ba...@usgs.gov> Date: 1/25/18 7:17 PM (GMT-07:00) To: heal...@avanthar.com Cc: SIMH <simh@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 ba...@usgs.gov On 25 Jan 2018, at 6:04:06 PM, simh-requ...@trailing-edge.com wrote: Message: 3 Date: Thu, 25 Jan 2018 18:01:41 -0800 From: Zane Healy <heal...@avanthar.com> To: Dennis Boone <d...@msu.edu> Cc: simh <simh@trailing-edge.com> Subject: Re: [Simh] VAX Tape Emulation? Message-ID: <fb0095e0-4ec6-46ca-aeeb-52eee3152...@avanthar.com> Content-Type: text/plain; charset=utf-8 On Jan 25, 2018, at 2:22 PM, Dennis Boone <d...@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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