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From: euaanu@eua.ericsson.se (Arto Nummelin)
Newsgroups: comp.sys.atari.st
Subject: SIMMs for the STE
Keywords: SIMM, STE,
Message-ID: <2703@erix.ericsson.se>
Date: 4 Mar 90 19:24:30 GMT
Sender: news@erix.ericsson.se
Reply-To: euaanu@euas20.ericsson.se (Arto Nummelin)
Organization: Ellemtel Utvecklings AB, Stockholm, Sweden
Lines: 56

I've just tested 1M x 8 SIMMs from a Mac IIcx in my 520 STE.  IT WORKED!!!
I took out the 256k x 8 SIMM (150 ns) and replaced them with two
1M x 8 (80 ns) made by Samsung. Then I booted up and checked with a DA
the amount of memory installed. 2048k it said!!!
Then I tried to add my own SIMMs to the two free sockets. When
I booted, it rebooted, rebooted ....... So it seems that you can't
mix the 1M and 256k SIMMs.

Here's the pinout for the SIMM if anybody is interested:

1  +5V
2  CAS
3  D0
4  A0
5  A1

6  D1
7  A2
8  A3
9  GND
10 D2

11 A4
12 A5
13 D3
14 A6
15 A7

16 D4
17 A8
18 A9
19 -
20 D5

21 WE
22 GND
23 D6
24 -
25 D7

26 -
27 RAS
28 -
29 -
30 +5V

I found an article in BYTE Jan 88 (Ciarcia's circuit cellar, BCC180 computer)
with a SIMM in the schematic. The article number for that SIMM (a 256k x 8)
was HB 561009A. I checked that my SIMM had the same pinout (except for 
pin 18 which is only on 1M SIMMs).

So now you know. 

/Arto Nummelin

Arto.Nummelin@euas20.ericsson.se