From: Hans Bachner <Hans@Bachner.priv.at>
Newsgroups: comp.sys.dec
Subject: Re: Desperately need 16MB RAM for a VAXstation 3100 M76
Date: 30 Apr 2011 01:10:40 GMT
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Hans Vlems <hvlems@freenet.de> wrote:

<snip>
> MS44 memory is also used in VAXstation 4000 models (-60, -90, -90A)
> isn't it?

According to the docs I have access to only the MS44-AA modules (part 
number 54-19103-AA) work in the 3100/76. These modules can also be used 
in the 4000-60 and 4000-90(A?).

There are other MS44 parts, including:
MS44L-AA (part# 54-19145-AA, a "low cost" 4 MB module)
  (I also found MS44-AL and MS44L-AL with the same description)
MS44-CA (part# 54-19103-CA, 16 MB)

all of which can be used in the 4000-60 and 4000-90 models.

> Ebay:
> <http://cgi.ebay.com/MS44L-BA-8MB-MEMORY-MV3100-VAXstation-
40000-/310255691809?
pt=COMP_EN_Networking_Components&hash=item483cae2821> 

(sorry for the broken Link)
this (8 MB MS44L-BA) will probably not work in the 3100/76, nor in the 
4000 models. It was probably used in the MicroVAX 3100 Model 40 and 
Model 80, and another guide explicitely mentions the 8 MB modules could 
not be reused when upgrading a Model 80 to a Model 90.

The modules should have the two distinguishing letters (AA, BA, CA) 
etched into the lower left corner.

The VAXstation 4000 Model 96 SOC lists, along with the MS44-CA module, a 
faster MS44L-EA module (4 MB, operating at 60ns vs. 100ns for all the 
other MS44(L) modules).

Other MS44(L) part numbers were used for memory "kits":

MS44L-BC 16 MB ECC memory for 3100 Models 85 and 96
   (consists of four MS44L–AA (4 MB) modules)
MS44-DA  32 MB (consists of two 16 MB modules)
MS44-DC  64 MB ECC memory for 3100 Models 85 and 96
   (consists of four MS44–CA (16 MB) modules)
MS44L-FA 16 MB (consist of four of the faster MS44L-EA modules)

And there's probably more... :-)

Hans.