VAX 4000/300 start up / KA670 issues

Antonio Carlini a.carlini at
Mon Sep 14 09:43:18 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.

> 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.

A further alternative would be an HSDx0 + BA350 + StorageWorks disks in 


Antonio Carlini
antonio at

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