AppleWin/help/clock.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Clock</title>
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<h2 style="COLOR: rgb(0,128,0)">
Clock</h2>
<hr size="4">
<h3>Clock:</h3>
<p>AppleWin emulates a No-Slot clock (aka NSC).</p>
<p>This is a chip (a Dallas SmartWatch DS1216) that sits under one of the 28-pin ROM chips in the Apple II.<br>
No hardware configuration is required: this chip is always present, but won't interfere with emulation when not in use.
</p>
<p>It requires a software driver to be installed (for DOS and ProDOS). This driver then emulates the Thunderclock card.</p>
<p>Here's a summary of NSC/ROM chip locations and which drivers work:</p>
<ul>
<li>"CD" ROM socket: C000-DFFF (internal) ROM space - all drivers work</li>
<li>"EF" ROM socket: E000-FFFF ROM space - never seen any drivers use this space</li>
<li>"CF" ROM socket: C000-FFFF (internal) ROM space - all drivers work</li>
<li>Slot ROM socket: Cs00-CsFF (slot) ROM space - NS.CLOCK.SYSTEM works</li>
</ul>
<p>Here are the drivers and ROM pages they check:</p>
<ul>
<li>ProDOS "SWU.SYSTEM" - internal C3</li>
<li>ProDOS "NS.CLOCK.SYSTEM" - internal C3 C8 / external C1-C7</li>
<li>GEOS "NoSlot Clock" - internal C8</li>
</ul>
<p><strong>NOTE: </strong>For ProDOS, the load order of drivers is important:</p>
<p>Some .SYSTEM drivers will <strong>not</strong> chain-load the next driver.<br>
NS.CLOCK.SYSTEM does, so ensure this is the first one ProDOS finds,
whereas ZIP.SYSTEM doesn't so put this at the end of the chain.</p>
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