11 lines
2.2 KiB
HTML
11 lines
2.2 KiB
HTML
<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>HCF</title><link rel="stylesheet" href="../../jargon.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.61.0"/><link rel="home" href="../index.html" title="The Jargon File"/><link rel="up" href="../H.html" title="H"/><link rel="previous" href="hat.html" title="hat"/><link rel="next" href="heads-down.html" title="heads down"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">HCF</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="hat.html">Prev</a> </td><th width="60%" align="center">H</th><td width="20%" align="right"> <a accesskey="n" href="heads-down.html">Next</a></td></tr></table><hr/></div><dt><a id="HCF"/><dt xmlns="" id="HCF"><b>HCF</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="pronunciation">/H·C·F/</span>, <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">n.</span></dt></dt><dd><p> Mnemonic for ‘Halt and Catch Fire’, any of several
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undocumented and semi-mythical machine instructions with destructive
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side-effects, supposedly included for test purposes on several well-known
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architectures going as far back as the IBM 360. The MC6800 microprocessor
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was the first for which an HCF opcode became widely known. This
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instruction caused the processor to <a href="../T/toggle.html"><i class="glossterm">toggle</i></a> a subset
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of the bus lines as rapidly as it could; in some configurations this could
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actually cause lines to burn up. Compare
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<a href="../K/killer-poke.html"><i class="glossterm">killer poke</i></a>.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="hat.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="../H.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="heads-down.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">hat </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> heads down</td></tr></table></div></body></html>
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