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https://github.com/AppleWin/AppleWin.git
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39 lines
1.8 KiB
HTML
39 lines
1.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<title>Clock</title>
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<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
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</head>
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<body style="FONT-FAMILY: verdana; BACKGROUND-COLOR: rgb(255,255,255)" alink="#008000"
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link="#008000" vlink="#008000">
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<h2 style="COLOR: rgb(0,128,0)">
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Clock</h2>
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<hr size="4">
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<h3>Clock:</h3>
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<p>AppleWin emulates a No-Slot clock (aka NSC).</p>
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<p>This is a chip (a Dallas SmartWatch DS1216) that sits under one of the 28-pin ROM chips in the Apple II.<br>
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No hardware configuration is required: this chip is always present (unless -no-nsc is used), but won't interfere with emulation when not in use.
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</p>
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<p>It requires a software driver to be installed (for DOS and ProDOS). This driver then emulates the Thunderclock card.</p>
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<p>Here's a summary of NSC/ROM chip locations and which drivers work:</p>
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<ul>
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<li>"CD" ROM socket: C000-DFFF (internal) ROM space - all drivers work</li>
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<li>"EF" ROM socket: E000-FFFF ROM space - never seen any drivers use this space</li>
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<li>"CF" ROM socket: C000-FFFF (internal) ROM space - all drivers work</li>
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<li>Slot ROM socket: Cs00-CsFF (slot) ROM space - NS.CLOCK.SYSTEM works</li>
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</ul>
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<p>Here are the drivers and ROM pages they check:</p>
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<ul>
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<li>ProDOS "SWU.SYSTEM" - internal C3</li>
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<li>ProDOS "NS.CLOCK.SYSTEM" - internal C3 C8 / external C1-C7</li>
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<li>GEOS "NoSlot Clock" - internal C8</li>
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</ul>
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<p><strong>NOTE: </strong>For ProDOS, the load order of drivers is important:</p>
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<p>Some .SYSTEM drivers will <strong>not</strong> chain-load the next driver.<br>
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NS.CLOCK.SYSTEM does, so ensure this is the first one ProDOS finds,
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whereas ZIP.SYSTEM doesn't so put this at the end of the chain.</p>
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</body>
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</html>
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