DEC MS630/M7609 Question

W2HX w2hx at
Tue Jul 9 18:43:17 CDT 2019

Thanks, Lyle. I was reading this. I guess its wrong?

The MS630 memory expansion module was used for expanding memory capacity. Four variants of the MS630 existed: the 1 MB MS630-AA, 2 MB MS630-BA, 4 MB MS630-BB and the 16MB MS630-CA. 

Wouldn't be the first time wikipedia was wrong...


From: Lyle Bickley <lbickley at>
Sent: Tuesday, July 9, 2019 6:08 PM
To: cctech at
Cc: W2HX
Subject: Re: DEC MS630/M7609 Question

On Tue, 9 Jul 2019 21:11:39 +0000
W2HX via cctech <cctech at> wrote:

> Hi there.
> I just acquired a board with the number M7609. It was advertised as an
> M630-CA which my research tells me is supposed to be 16MB. How do I tell on
> the board if this is 8MB or 16MB? There does not seem to be a suffix on the
> board that I can see.
> What to look for?

M7609-AA    MS630-CA    Q   8-Mbyte parity 36-bit RAM for KA630 (MicroVAX II)

73   NM6Y
Bickley Consulting West Inc.

"Black holes are where God is dividing by zero"

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