[rescue] upgrading VAXstation memory

Jonathan Patschke jp at celestrion.net
Tue Apr 20 15:46:34 CDT 2010

On Tue, 20 Apr 2010, John Floren wrote:

> On a similar note, I'd like to get a bigger and quieter hard disk.

What OS do you intend to run?

> onboard NCR 53c94 SCSI-2 narrow (8 bits bus)
> internal 50 pin round cable male connector, 3 positions free
> external 50 pin centronix female [not a separate bus, last connector
> of the internal cable]

Yes, the system has one narrow single-ended SCSI bus.

> I'm not very familiar with SCSI; what would I need to look for when
> trying to find a new hard disk?

Any 50-pin single-ended SCSI disk will work.  No 50-pin differential SCSI
disk will work.  Some 68-pin disks (single-ended or LVD only, not
DIFF/HVD) may work, if you get an adapter that properly terminates the
high ID bit and upper data lines.  Single-ended and LVD SCA disks will
work with an appropriate adapter.

Your OS may limit the size of disk you can use.  I haven't powered up my
4000/60 in a while, but I'm fairly sure it has a 4GB disk in it with
OpenVMS installed.

Jonathan Patschke  ) "Oh, judge, your damn laws: the good people don't
Elgin, TX         (   need them, and the bad people don't follow them,
USA                )  so what good are they?"          --Ammon Hennacy

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