Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!cornell!uw-beaver!microsoft!stuartb
From: stuartb@microsoft.UUCP (Stuart Burden)
Newsgroups: comp.sys.mac
Subject: Re: Another Memory Question?
Keywords: Memory SIMMS MAC II
Message-ID: <56@microsoft.UUCP>
Date: 12 Dec 88 14:02:19 GMT
References: <825@savax.UUCP>
Reply-To: stuartb@microsoft.UUCP (Stuart Burden)
Organization: Microsoft Corp., Redmond WA
Lines: 45

In Article <825@savax.UUCP> michali@savax.UUCP (Paul C. Michali) writes:
     | Someone had mentioned that memory on the PLUS and SE had
     | to be done in pairs.

On the Plus and SE, there are two banks of two SIMM slots.  Each bank must
be fully populated for the memory in either bank to be recognised.

     | Is this true for the Mac II?  Can one have 3MB ( four 256K
     | and two 1M SIMMS)?

The Mac ][ has 2 banks of four SIMM's.  Again, each bank must be fully
populated for the memory in either bank to be used by the Mac.

Therefore it is not possible to use just one 1meg SIMM to upgrade the
second bank on the Mac ][ to 2megs (or three).

Upgrade configurations from 1 meg are:

   2 meg (second bank populated with 256K SIMM's)
   5 meg (second bank populated with 1 meg SIMM's)
   8 meg (remove 1st bank of 256K SIMM's and fully
          populate both banks with 1 meg SIMM's)

     | We are looking to buy a Mac and can get a 2M SIMM package
     | from National Semi for a good price,  but I am concerned
     | abouth whether I must trash two of the 256K SIMMS to end
     | up with 2.5MB or just insert two 1M SIMMS to get 3MB.

Again, you will have to install 4 SIMM's, or the Mac will not recognise
the memory in that particular bank (the 2.5 meg configuration is possible
on the Plus and the SE, where one bank would still have two 256K SIMM's,
and the other bank will have two 1 meg SIMM's).

     | Thanks in advance, PCM

Stu.

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microsoft!stuartb@beaver.cs.washington.edu  -   Usual disclaimer, that all
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