[Info-vax] Replacing SCSI disks in PS433AU for VMS

[Chris Townley]

On Friday, October 2, 2020 at 4:51:22 PM UTC+1, John H. Reinhardt wrote:
> On 10/2/2020 10:45 AM, Chris Townley wrote:
> > On Thursday, October 1, 2020 at 7:15:01 PM UTC+1, johnwa... at yahoo.co.uk wrote:
> >>> Chris
> >>
> >> Bear in mind that what's usable as an SRM-bootable VMS system disk is
> >> likely a subset of what's usable as a data disk in the same box.
> >> Apologies if you already knew that.
> > 
> > Interesting point. Any ideas what restrictions for a VMS boot disk?
> > 
> > CHris
> > 
> 
> I had a PWS433AU at one time.  Being SCSI, being SRM-bootable is a lot less dependent on the disk than the controller.  Not like the old MFM and EDSI disks.  I don't recall if the PWS433 had an on board SCSI controller.  But any of the typical SCSI cards from that era will work and pretty much any SCSI drive is bootable.  The PWS433 doesn't have the limitation that certain MicroVAX 3100's had on boot drive size.
> 
> -- 
> John H. Reinhardt

Thanks

The spec shows the built in SCSI controller as:

> SCSI adapter: 32-bit ultra-wide SCSI (UW-SCSI)
> adapter that supports 50-pin narrow, 68-pin wide, and 68-
> pin ultra-wide SCSI devices.

I understand this is a Qlogic 1020A Fast SCSI adapter

I also have another wide controller for a BA356 externally, but I get too many errors on that for a boot disk. I think the cable is too long


Chris