VAX Q-bus identical to PDP-11 Q-bus?

Aaron Jackson aaron at
Wed Dec 6 15:43:39 CST 2017

Thanks Glen and Jerry.

I think that settled that debate! haha


Glen Slick writes:

> An M5976 KZQSA is not MSCP compatible so it wouldn't do any good with a
> PDP-11 system. It's really only useful for RRD4x SCSI CD-ROM drives with
> VMS on a VAX 4000.
> On Dec 6, 2017 9:47 AM, "Aaron Jackson via cctech" <cctech at>
> wrote:
> I'm looking after a VAX 4000 for a friend, which has a SCSI Q-bus card
> (M5976). If the card did not have the large metal face, would it work in
> a Q-bus PDP-11? We are not going to potentially ruin a card by trying
> this, but I am interested to know if this is the case.
> Thanks,
> Aaron.

Aaron Jackson
PhD Student, Computer Vision Laboratory, Uni of Nottingham

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