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From: Jim.Spencer@p510.f22.n282.z1.fidonet.org (Jim Spencer)
Newsgroups: comp.sys.mac.hardware
Subject: Adding 1MB to an old Macintosh+
Message-ID: <2.279FC792@mmug.mn.org>
Date: 25 Jan 91 05:00:19 GMT
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Organization: FidoNet node 1:282/22.510 - Macintosh SmorgasBo, Bloomington MN
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Hauke Hess writes in a message to All

HH> I own a Macintosh+ and would like to expand its RAM to 2 MB. 
HH> Several people told me different things about the complexity 
HH> of this task. Some told me of 'only plugging in a SIMM 1MBx9, 
HH> 70ns in the right place', others that I 'should pull out the 
HH> old RAM, have to buy 2MB of SIMMS and plug them in instead of 
HH> the old RAM', and then there was the cloudy hint 'to remove some 
HH> resistors and then plug in a SIMM at the right place'. The second 
HH> answer was from my local Apple distributor.

The first answer is completely wrong.  The Plus only requires 150ns SIMMs.  Anything faster gets you nothing but it won't hurt (just so you don't buy fx SIMMs but you would have to hunt for those.) 

Both the second and third answers (when combined) are correct.  Your Plus has 4 SIMM slots.  These are currently occupied by 4 256k SIMMs so to install more RAM you will have to remove at least two of these. (Plus SIMMs must be installed in pairs which must match.)  Because of this however, there is absolutely no sense in upgrading to 2 MB.  Rather you go to 2.5 MB by leaving two of the 256k SIMMs and replacing the other two with 1MB Simms.  You can take out all 4 256k SIMMs and only put back the 2 1MB SIM









Ms but why would you want to.  Your only other option is to replace all 4 current SIMMs with 1MB SIMMs while you've got it open.

The job is not hard and most SIMM sellers will also sell you a pamphlet on how to do it but you do have to clip a resister when you upgrade to either 2.5 MB or to 4MB.  Again, the pamplets show you which resister to clip.  (There's no soldering or anything like that.)  Obviously care is needed, especially so because on a Plus you will be working around the naked monitor.  If you feel uncomfortable installing the new RAM yourself, you should have no problem finding someone to help you who has done it before