What have I got? DEC ????

From: Mike Cesari <mcesari_at_comcast.net>
Date: Thu Feb 24 10:12:32 2005

On Feb 24, 2005, at 7:51 AM, Joe R. wrote:

> Yesterday I picked up a DEC card cage full of cards. A sticker on the
> back of the backplane says "Option MS 780, Made in Canada, Part No.
> 13625-00" and "Date June" and what looks like 1982 but the year is very
> hard to read.
>
> It has 20 slots in it and all of them have cards installed. Here's a
> list of the cards in it:
>
> The first five slots all have a blank filler cards marked 70 14103.
> The next four cards are marked M8210 AZ.
> The next card is marked M8210 AN.
> The next three cards are marked M8210 AZ.
> The next four cards are marked M8210 AK.
> The next card is marked M8212 D
> The next card is marked M8213 E
> The next card is marked M8214 D.
>
> What have I got?
>
> Joe
>
>

You have an MS780-C, the original memory for a VAX780. Each card cage
holds up to
4 MB. Each M8210 [1] is 256KB, organized as 64K x 32 bits, with 7 bits
for ECC. I
don't remember if the ECC had parity protection or not. You have 3 MB
in your cage.

Mike

[1] As usual for DEC memory on "M" modules, the letters designate board
revision (first)
and the manufacturer of the memory IC's (second). In sales doco., an
M8210 would be referred
to as an M8210-A*. At least from what I saw at the time.
Received on Thu Feb 24 2005 - 10:12:32 GMT