Help identifying mystery Dataram VAX-11/750 (?) board

Josh Dersch derschjo at
Thu Jul 16 15:41:59 CDT 2020

On Thu, Jul 16, 2020 at 1:34 PM Josh Dersch <derschjo at> wrote:

> Hi all --
> Picked up a board advertised as a "4mb memory board" for a VAX-11/750.
> It's made by Dataram and I'm unsure of the model number, based on photos of
> it.  I just noticed that rather than being a hex-height board that goes in
> the memory backplane, it looks like a board that goes in the main CMI
> backplane.  It also appears to have 16mb of ECC memory on it, rather than
> 4mb.
> My thought is either (1) it's not actually for an 11/750 (in which case
> I'm curious what it would go into), or (2) it completely replaces the
> memory controller and standard memory and gives you 16mb in the 750.  (Or
> it could be that it's something else entirely.)
> If anyone has any ideas or has a source of information, let me know.  I
> put up a few pictures here:
> Thanks as always,
> - Josh

I think I may have answered my own question here; looks like it's for a VAX
8000 series:

- Josh

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