need a map through the MSV11 Qbus memory jungle

From: Antonio Carlini <Antonio.Carlini_at_riverstonenet.com>
Date: Wed May 22 11:23:31 2002

> Gunther Schadow wrote:
>
>in my VAX 11/780 I have the PDP-11/03 alias KC780. And it has
>the following memory board right now:
>
>M7944 MSV11-B Q 4-Kword 16-bit MOS RAM (external refresh)
>
>But, since I'm planning to upgrade to an 11/785 I need additional
>RAM. When it showed up on ePay I buyed a
>
>M8044-DA MSV11-DD Q 32-Kword 16-bit MOS RAM
>
>but the boot program will not load with this. Why would that be?


I'm at home now and I've been able to check
some manuals, without too much luck though.

The "LSI-11, PDP-11/03 user's manual" discusses
the KD11-F (M7264) and KD11-J (M7264-YA)
which seems to be the same module with
no RAM and packaged differently.

I don't know whether that's the module used in
the 11/780 console. I'm sure it's in one of those
manuals, but I bet you can find out quicker
by looking :-)

It also discusses usage (and jumpering) of
the MSV11-B (M7944) 4K memory board.

If your LSI CPU is the M7264(-YA) then you
probably want this manual anyway.

I also have a copy of the MSV11-P User
Guide but that discusses the M8067-LA,
-KA, -FA which are 256K, 128K
and 64K boards. Maybe useful as a
general reference but probably not applicable
to jumpering your stuff.

My random guess is either you have the
refresh wrong or the memory board
starting address is wrong. Sadly, even if
the guess is right, neither of these manuals
are likely to help you sort it out. Let me know
if you want them ftp'd somewhere anyway.

Antonio
Received on Wed May 22 2002 - 11:23:31 BST

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