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<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<html xmlns="http://www.w3.org/1999/xhtml"><head><title>backward combatability</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="../B.html" title="B"/><link rel="previous" href="backronym.html" title="backronym"/><link rel="next" href="BAD.html" title="BAD"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">backward combatability</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="backronym.html">Prev</a> </td><th width="60%" align="center">B</th><td width="20%" align="right"> <a accesskey="n" href="BAD.html">Next</a></td></tr></table><hr/></div><dt><a id="backward-combatability"/><dt xmlns="" id="backward-combatability"><b>backward combatability</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="pronunciation">/bak´w@rd k@m·bat'@·bil'@·tee/</span>, <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">n.</span></dt></dt><dd><p>[CMU, Tektronix: from <span class="firstterm">backward
compatibility</span>] A property of hardware or software revisions in
which previous protocols, formats, layouts, etc. are irrevocably discarded
in favor of &#8216;new and improved&#8217; protocols, formats, and layouts,
leaving the previous ones not merely deprecated but actively defeated.
(Too often, the old and new versions cannot definitively be distinguished,
such that lingering instances of the previous ones yield crashes or other
infelicitous effects, as opposed to a simple &#8220;<span class="quote">version
mismatch</span>&#8221; message.) A backwards compatible change, on the other
hand, allows old versions to coexist without crashes or error messages, but
too many major changes incorporating elaborate backwards compatibility
processing can lead to extreme <a href="../S/software-bloat.html"><i class="glossterm">software bloat</i></a>. See
also <a href="../F/flag-day.html"><i class="glossterm">flag day</i></a>.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="backronym.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="../B.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="BAD.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">backronym </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> BAD</td></tr></table></div></body></html>