VAX 4000/300 start up / KA670 issues

Aaron Jackson Aaron.Jackson at
Mon Sep 14 09:48:29 CDT 2020

> On 14/09/2020 15:02, Aaron Jackson via cctalk wrote:
>> Hi Dave,
>> In my ignorance I incorrectly assumed the DHQ11 was a SCSI controller
>> because it has compatible centronics sockets. Thinking about the name
>> that was obviously wrong!
> For the future:
> :-)


> I've not seen an octopus cable in a long time.
>> I have two Emulex UC07, one is spare and the other is in my PDP-11. If I
>> install this into the VAX Q22 bus do you think it will explode or work?
> The BA440 Qbus is 22 bits, so that should be fine shouldn't it? I've
> never tried that combination, so I don't know for sure, but I think the
> BA440 is QQCD (or whatever the designation is), no serpentine.

I was fairly sure it would be ok so plugged it in and managed to get
into the Emulex configuration menu very quickly. Next step, installing
NetBSD :)))

>> Even if this did work it wouldn't be ideal but I'm not sure of any
>> alternatives at the moment.
> KDB50 + RA drive? An RA7x would (almost certainly) fit in one of disk bays.
> You're supposed to use RF disks. I have an RF35 (or maybe two drives)
> here but I don't know their status. I *think* they're SCSI with an
> adapter board, and if so I could check the disk status at least.

I will look into this. thanks!


> A further alternative would be an HSDx0 + BA350 + StorageWorks disks in
> caddies.
> Antonio

Dr Aaron S. Jackson
Computer Vision Laboratory
School of Computer Science, University of Nottingham

I will be on leave every Monday and Tuesday until October 2020.

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