[rescue] SS2 memory?

[Gregory Leblanc]

On Wed, 2002-03-06 at 18:06, Eric Webb wrote:
> I ran across some 30-pin simms to throw into my SS2.  After plugging in and 
> "seeing what happens", they ended up being 4M sticks.  And now for the 
> questions:
> 
> 1.  The original 4M sticks in this machine consist of 9 chips and the ones I 
> just added consist of just 3 chips.  What does this mean and what are the 
> ramifications?  (ha)

A lot of this has been covered, so some of this is repeat.  All of this
information is first hand; that is, I sat down with about 200 simms, a
simm tester, and my SS2, and tried things.  There are two kinds of
3-chip SIMMs, logic-chip and true-parity.  From what I can recall, all
of them work, as long as you don't mix them.  That is, 3-chip
true-parity works with all other true-parity ram, but if you put any
logic-chip parity in there, then it doesn't work.  Mixing 3-chip and
9-chip true-parity works, from what I can remember.

> 2.  Secondly, the first 32M of memory use 80ns chips and the sticks that I 
> just added use 70ns chips.  Will this cause problems or is it just "bonus"?

Just "bonus".

> BTW, the bootup memory tests passed though I don't put full faith in it.

One of the distributed computing clients has an algorithm that happens
to do a really thorough job of testing ram.  I forget which one.
	Greg

-- 
Portland, Oregon, USA.