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			<title>Macintosh LC: Jumpers are for Apple IIe Card</title><body class="ac-gn-current-support">
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<h1 id="main-title">Macintosh LC: Jumpers are for Apple IIe Card</h1>
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<div id="intro-container"><div class="truncate"><div class="attr SYMPTOMS"><div class="attr TOPIC"><FONT SIZE=4>What are the three jumpers for on the logic board of the Macintosh LC?  I believe one is for the Apple IIe card, but I'd like to know what the other two do.<BR>
<BR>
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Installation of a jumper connection on the third set of jumper pins (the ones closest to the &quot;CPE&quot; silk screen marking on the logic board) locks out the Control Panel of the Apple IIe card. The other two sets of jumper pins are reserved by Apple and should never be connected. These jumpers also exist on the Macintosh LC II and Performa 405 logic boards, however the silk screen reads &quot;J17&quot;. <BR>
<BR>
When the jumper is installed on the logic board, users will continue to have access to the following Apple IIe Option Panel buttons:<BR>
<BR>
- Quit IIe<BR>
- Eject Disk<BR>
- Restart IIe<BR>
- Return<BR>
<BR>
However, users will not have access to any of the panels used to change Option Panel settings.<BR>
<BR>
Article Change History:<BR>
21 June 1994 - Updated to include information on LC II and Performa 405.<BR>
<BR>
Support Information Services<BR></div>
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<div class="mod-date">Published Date: Feb 18, 2012</div>
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