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			<title>LaserWriter IIf and IIg: Function of Jumper J11</title><body class="ac-gn-current-support">
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<h1 id="main-title">LaserWriter IIf and IIg: Function of Jumper J11</h1>
<div id="abstract">
 
<div id="intro-container"><div class="truncate"><div class="attr SYMPTOMS"><div class="attr TOPIC"><FONT SIZE=4><BR>
<BR>
On the Apple LaserWriter IIf and IIg I/O controller board, near the ROM<BR>
chips, is a set of jumper pins labeled J11.  What is their function?<BR>
<BR>
</FONT></div></div> <!--  attr Symptom  --></div> <!--  truncate --></div> <!--  intro-container --><div class="clear"> </div>
 </div>   <!-- abstract end -->
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  <div class="attr SUMMARY">
The jumper pins labeled J11 are at board position L7.  The jumper pins<BR>
allow the use of 8-megabit ROM chips, providing a total of 4MB of ROM<BR>
space.<BR>
<BR>
The jumper is factory set at the 2MB setting to allow the use of four<BR>
4-megabit ROMs, providing a total of 2MB of ROM space.  There are no<BR>
existing Apple or third-party upgrades that use the 4MB setting.<BR>
<BR>
All Apple LaserWriter IIf and IIg printers should be set at the 2MB<BR>
setting.<BR>
<BR>
<BR></div>
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<div class="mod-date">Published Date: Feb 18, 2012</div>
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