Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!rpi!nyser!rodan!isr
From: isr@rodan.acs.syr.edu ( ISR group account)
Newsgroups: comp.sys.mac.hardware
Subject: Re: MacPlus Memory Upgrade Help Needed
Keywords: -NO-NO-NO-NO-
 >SIMMS in the second.  After you've installed the SIMMS you'll need to
 > cut a transistor, which is located in the upper left corner of the
 > logic board.  This transistor is labeled:  256K BIT MASK
 This is in error, (slightly, but may c
Message-ID: <1203@rodan.acs.syr.edu>
Date: 2 Nov 89 01:02:34 GMT
References: <955@manta.NOSC.MIL>
Reply-To: isr@rodan.acs.syr.edu (Michael S. Schechter - ISR group account)
Distribution: usa
Organization: Syracuse University, Syracuse, NY
Lines: 32

The board appears as follows:
 
                      RAM SIZE
               |----------------| 
           R8  |    -XXXXXXX-   |
               |    256K  BIT   |
           R9  |    -XXXXXXX-   |
               |--- ONE ROW ----|

The "-XXXXXX-" are RESISTORS, not TRANSSISTORS.

The following configuration shows what should be installed:
Total Memory       Simms1&2     Simms3&4    R8(256KBIT)   R9(1Row)
  512K               256k          -          150ohm       150ohm
   1Meg              256k         256k        150ohm          -
   2Meg              1MB           -            -           150ohm
   2.5Meg            1MB           256k           -           -
    4Meg             1MB           1MB           -            -

The resistors already there ARE 150ohms, i gave values so in case
you ever wanted to put one back, you know what to get from your
local electronics place. (but, if you don't know how to read a 
resistor value, you probably don't want to solder on the board)
Mike  Schechter
Computer Systems Engineer and VIP car-fixer
Institute for Sensory Research, Syracuse, NY



-- 
 Mike Schechter, Institute for Sensory Research, Syracuse Univ.
InterNet: isr@rodan.syr.edu  msschech@rodan.syr.edu  Bitnet: SENSORY@SUNRISE