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From: ags@seaman.cc.purdue.edu (Dave Seaman)
Newsgroups: comp.sys.mac
Subject: Re: Simm installation
Message-ID: <5834@mentor.cc.purdue.edu>
Date: 11 Dec 89 20:34:16 GMT
References: <1989Dec6.215849.16064@cunixf.cc.columbia.edu> <1989Dec11.112101.213@isis.educ.lon.ac.uk>
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Reply-To: ags@seaman.cc.purdue.edu (Dave Seaman)
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>In article <1989Dec6.215849.16064@cunixf.cc.columbia.edu> reyes@cunixf.cc.columbia.edu (Alex Reyes) writes:

>>I recently received four 1 meg simms from the chip merchants for my IICX.
>>... Was it really
>>necessary to install the 1 meg simms in bank A and the smaller 256 in
>>bank B or was it just an odd coincidence?

In article <1989Dec11.112101.213@isis.educ.lon.ac.uk> tejtemw@isis.educ.lon.ac.uk (EARL WILLIAMS) writes:
>Installing SIMMs is not just a matter of snapping them in; you have to 
>attach/detach the correct resistors or set the jumpers correctly.  This
>may have caused the variation in recognized RAM you got.  If you post
>your hardware configuration (i.e. what Mac you have), someone can probably
>tell you which resistor/jumper setting to use.

I presume Alex has a IICX, since that is what he said he has.  I have not
installed simms in a IICX, but I have installed 1 Mb simms in a plain II, and 
I can tell you that there are no resistors or jumpers to worry about.  I 
believe that is true of all of Apple's newer machines.

One of the Apple manuals (I think the Owner's Manual, but I could be wrong) 
explains how to add memory and clearly states that if different simms are 
installed in the two banks, then the higher-capacity simms must be installed 
in bank A.  Following the instructions, I moved the 256K simms to bank B and
then installed the new 1 Mb simms in bank A.  When I booted I had 5 Mb of RAM.

--
Dave Seaman	  					
ags@seaman.cc.purdue.edu