Editing Xterm (section)

===Terminal emulation===
Early versions emulated the [[VT102]] and [[Tektronix 4014]].  <ref>{{cite web|url=https://invisible-island.net/xterm/xterm.faq.html#what_is_it|title=What is XTerm?|author=Thomas E. Dickey|access-date=2018-06-04|archive-url=https://web.archive.org/web/20180624104926/https://invisible-island.net/xterm/xterm.faq.html#what_is_it|archive-date=2018-06-24|url-status=live}}</ref>

Later versions added control sequences for [[Digital Equipment Corporation|DEC]] and other terminals such as:
* [[VT220]]: Added in patch 24.<ref name=p24>{{Cite web|url=https://invisible-island.net/xterm/xterm.log.html#xterm_24 |title=Patch #24 - 1996/8/11 - XFree86 3.1.2Ee |access-date=2008-02-25 |archive-url=https://web.archive.org/web/20011222194057/http://invisible-island.net/xterm/xterm.log.html#xterm_24 |archive-date=2001-12-22 |url-status=live}}</ref> Later, in 1998, xterm added support for VT220 features, such as extending its support of [[ISO-2022]] [[ISO-2022#Shift functions|''shift functions'']] to provide the [[National Replacement Character Set]] feature.
* [[VT320]]: Added in patch 24.<ref name=p24 />
* [[VT420]]: DECSTR (soft terminal reset) was added in patch 34.<ref name=p34>{{Cite web |url=https://invisible-island.net/xterm/xterm.log.html#xterm_34 |title=Patch #34 - 1997/1/5 - XFree86 3.2o |access-date=2008-02-25 |archive-url=https://web.archive.org/web/20011222194057/http://invisible-island.net/xterm/xterm.log.html#xterm_34 |archive-date=2001-12-22 |url-status=live }}</ref>    In 2012, xterm's default emulation was changed to [[VT420]] to allow [[tmux]] to assume the corresponding left/right margin support.<ref name=p280>{{Cite web|url=https://invisible-island.net/xterm/xterm.log.html#xterm_280 |title=Patch #280 - 2012/06/24 |access-date=2021-12-21 |archive-url=https://web.archive.org/web/20120926050154/https://invisible-island.net/xterm/xterm.log.html#xterm_280 |archive-date=2012-09-26 |url-status=live}}</ref>
* [[VT520]]: Although not officially emulated, parts of VT520 features were implemented.<ref>{{Cite web |url=https://invisible-island.net/xterm/xterm.faq.html#why_not_vt520 |title=Why not emulate VT520? |access-date=2007-01-06 |archive-url=https://web.archive.org/web/20120325084746/http://invisible-island.net/xterm/xterm.faq.html#why_not_vt520 |archive-date=2012-03-25 |url-status=live }}</ref> Controls DECSMBV and DECSWBV for setting the margin- and warning-bell volume were added in patch 254.<ref name=p254>{{Cite web |url=https://invisible-island.net/xterm/xterm.log.html#xterm_254 |title=Patch #254 - 2010/1/6 |access-date=2021-12-21 |archive-url=https://web.archive.org/web/20110412000243/http://invisible-island.net/xterm/xterm.log.html#xterm_254 |archive-date=2011-04-12 |url-status=live }}</ref>