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<h1 id="main-title">Macintosh LC II: RAM Expansion (7/93)</h1>
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Article Change History<BR>
----------------------<BR>
07/12/93 - REVISED<BR>
           * To include Performa<BR>
<BR>
<BR>
<BR>
When 4MB RAM resides on the logic board, how do I populate the two SIMM<BR>
slots to get 10MB in the Macintosh LC II or Performa 400, 405, and 430?<BR>
<BR>
<BR>
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In the case of 4MB soldered on the printed circuit board (PCB), you need an<BR>
8MB RAM expansion kit to get 10MB.  This configuration has 12MB of RAM<BR>
present in the system.  However, the Memory Map reserves only the first<BR>
10MB of address space for RAM.  Therefore, the lower 2MB on the PCB can't<BR>
be accessed when a 4MB base system is fully expanded.  Even though, 32-bit<BR>
addressing allows up to 1GB address space for RAM, there are only 24<BR>
address lines.  Hence Macintosh LC II can see only 10MB of physical RAM.<BR>
<BR></div>
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<div class="mod-date">Published Date: Feb 18, 2012</div>
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