View source for Engineering:IBM Personal Computer XT

{{Short description|Personal computer model released in 1983}}
{{Use mdy dates|date=January 2023}}
{{Infobox information appliance
| name = IBM Personal Computer XT
| title =
| aka = IBM XT, PC/XT, XT
| logo = IBM Personal Computer XT badge recreation.svg
| logo_upright = 0.5
| image = IBM PC XT color.jpg
| caption =
| developer =
| manufacturer = [[Company:IBM|IBM]]
| family =
| type = [[Engineering:Personal computer|Personal computer]]
| generation =
| releasedate = {{Start date and age|1983|03|08}}
| lifespan =
| price =
| discontinued = {{End date|1987|04}}
| unitssold =
| unitsshipped =
| media =
| os = [[IBM BASIC]] / [[Software:PC DOS|PC DOS]] 2.0-3.20 / PC/IX / [[Company:Santa Cruz Operation|SCO]] [[Software:Xenix|Xenix]]
| power = 120/240 VAC
| soc =
| cpu = [[Engineering:Intel 8088|Intel 8088]] @ 4.77&nbsp;MHz
| memory = 128&nbsp;KB – 640&nbsp;KB
| storage = 10–20&nbsp;MB hard drive
| memory card =
| display =
| graphics = [[IBM Monochrome Display Adapter|MDA]], [[Color Graphics Adapter|CGA]]
| sound = [[Engineering:PC speaker|PC speaker]] 1-channel square-wave/1-bit digital ([[Pulse-width modulation|PWM]]-capable)
| input =
| controllers =
| camera =
| touchpad =
| connectivity =
| platform =
| service =
| dimensions = W: {{cvt|19.5|in|cm}}<br />H: {{cvt|5.5|in|cm}}<br />D: {{cvt|16|in|cm}}
| weight = {{cvt|32|lb}}
| topgame =
| compatibility =
| predecessor = [[Engineering:IBM Personal Computer|IBM Personal Computer]]
| successor = {{ubl|[[Engineering:IBM Personal Computer AT|IBM Personal Computer AT]] (next model)|IBM PS/2 Model 30 (direct replacement)}}
| related = List of IBM Personal Computer models
| website = <!--{{URL|example.org}}-->
}}

The '''IBM Personal Computer XT''' (model 5160, often shortened to '''PC/XT''') is the second computer in the [[Engineering:IBM Personal Computer|IBM Personal Computer]] line, released on March 8, 1983.<ref>{{Cite book|last=Enterprise|first=I. D. G.|url=https://books.google.com/books?id=r6bSpuaCsE4C&q=IBM%20PC%20XT%20march%201983&pg=PA8|title=Computerworld|date=August 11, 1986|publisher=IDG Enterprise|language=en}}</ref> Except for the addition of a built-in [[Engineering:Hard disk drive|hard drive]] and extra expansion slots, it is very similar to the original IBM PC model 5150 from 1981.

== Name ==
IBM did not specify an expanded form of "XT" on the machine, press releases, brochures or documentation, but some publications expanded the term as "''eXtended Technology''" or just "''eXTended''".<ref>{{Cite book|url=http://ptgmedia.pearsoncmg.com/imprint_downloads/informit/que/upgrading/fourteenth_edition/DVD/PCs10th.pdf|title=Upgrading and Repairing PCs, 10th Edition|year=1998|pages=1115}}</ref>

== Features ==
The XT was regarded as an incremental improvement over the PC and a disappointment compared to the next-generation successor that some had anticipated. Compared to the original IBM PC, the XT has the following major differences:<ref name=":0">{{Cite magazine|url=https://archive.org/details/byte-magazine-1983-05|magazine=Byte |volume=8 |number=5 |page=520 |title=IBM Unveils Top-of-the-Line Personal Computer |date=May 1983}}</ref>
* The number of expansion slots was increased from five to eight
* Base RAM was increased to at least 128&nbsp;KB
* 2x32KB ROM ICs replace the previous 5x8KB ROM ICs
* A 10&nbsp;MB hard drive was included on most sub-models, with a [[Engineering:Disk controller|disk controller]] featuring Xebec ICs<ref name=wired>{{cite magazine | last=Barkow | first=Tim | date=October 1996 | url=https://www.wired.com/1996/10/es-intaglio/ | title=The Bottom Feeders | magazine=Wired | publisher=Wired Ventures | volume=4 | issue=10 | pages=110–127 | archiveurl=https://web.archive.org/web/20151112091504/https://www.wired.com/1996/10/es-intaglio/ | archivedate=November 12, 2015}}</ref>{{rp|111}}
* [[Software:IBM PC DOS#PC DOS 2.x|PC DOS 2.0]] was included
* The [[Engineering:DIN connector#Analog audio|5-pin DIN]] for the cassette interface was removed

Otherwise the specifications are identical to the original PC.

=== Expansion slots ===
The number of expansion slots in the original IBM PC was a limiting factor for the product, since essential components (such as the video controller, disk controller and printer interface) each came as separate expansion cards and could quickly fill up all five available slots, requiring the user to swap cards in and out as tasks demanded.<ref name="dievendorff19811007">{{cite book|author=Dievendorff, Dick|url=http://bitsavers.trailing-edge.com/pdf/ibm/pc/pc/|title=IBM Personal Computer Questions and Answers|publisher=IBM|year=1981|pages=9–10}}</ref> Some PC clones addressed this problem by integrating components into the motherboard to free up slots,<ref name="freeze19851216">{{cite news|author=Freeze, Ken|date=December 16, 1985|title=Leading Edge: Superior Value In IBM-PC Clone Market Contest|pages=43|work=InfoWorld|url=https://books.google.com/books?id=cC8EAAAAMBAJ&pg=PA43|access-date=July 22, 2014}}</ref> while peripheral manufacturers produced products which integrated multiple functions into one card.<ref>{{Cite book|url=https://books.google.com/books?id=wS8EAAAAMBAJ&q=%22Multifunction+Cards+for+IBM+PCs%22&pg=PA76|title=InfoWorld|date=November 14, 1983|publisher=InfoWorld Media Group, Inc.|language=en}}</ref><ref name=":1">{{Cite magazine|url=https://archive.org/details/byte-magazine-1983-11|magazine=Byte |volume=8 |number=11 |title=Inside the IBM PC|date=November 1983}}</ref>

The XT addressed the problem by adding three extra expansion slots for a total of eight. While the slots themselves are identical to those in the original PC, the amount of physical space in the chassis differs, so two of the new slots (located behind the hard drive) cannot accept full-length cards. In addition, the spacing of the slots is narrower than in the original PC, making it impossible to install some multi-board cards.<ref name=":0" /><ref name=":1" />

=== Expansion unit ===
The 5161 is an expansion chassis using an identical case and power supply to the XT, but instead of a system board, provides a backplane with eight card slots. It connects to the main system unit using an Extender Card in the system unit and a Receiver Card in the Expansion Unit, connected by a custom cable.<ref name=":0" /> The 5161 shipped with a 10&nbsp;MB hard drive, and had room for a second one.<ref name=":1" />

The Expansion Unit can also contain extra memory, but the Extender card inserts wait states for memory in the Expansion Unit, so it may be preferable to install memory into the main system unit.

The 5161 can be connected to either an XT or to the earlier 5150 (the original IBM PC).<ref>Personal Computer Family Service Information Manual (January 1989), IBM document SA38-0037-00, pages 7-1 to 7-3</ref>

=== Other features ===
PC DOS 2.0 offers a 9-sector [[Floppy disk|floppy disk]] format, providing 180K/360K (single- vs. dual-sided) capacity per disk, compared to the 160K/320K provided by the 8-sector format of previous releases.<ref name=":0" />

The XT was not offered in a floppy-only model for its first two years on the market, although the standard ribbon cable with two floppy connectors was still included. At that time, in order to get a second floppy drive, the user had to purchase the 5161 expansion chassis.<ref name=":1" />

Like the original PC, the XT came with [[IBM BASIC]] in [[Read-only memory|ROM]]. The XT BIOS also displays a memory count during the [[Power-on self-test|POST]], unlike the original PC.

The XT has a desktop case similar to that of the IBM PC. It weighs {{convert|32|lb}} and is approximately {{convert|19.5|in|cm}} wide by {{convert|16|in|cm}} deep by {{convert|5.5|in|cm}} high.

Similarly to the original IBM PC, the XT main board included a socket for the [[Intel 8087]] floating point arithmetic [[Coprocessor|coprocessor]]. This optional chip, when installed, greatly accelerated arithmetic for such applications as computer aided design or other software that required large amounts of arithmetical calculations. Only software that was especially written to take advantage of the coprocessor would show a significant speedup.<ref name="Mueller92" />

The power supply is 130 watts, an upgrade from the original PC. Those sold in the US were configured for 120 V AC only and could not be used with 240 V mains supplies.<ref name="Mueller92">{{cite book |first=Scott |last=Mueller |title=Upgrading and Repairing PCs |edition=2nd |publisher=Que Books |year=1992 |isbn=0-88022-856-3 |pages=59–79}}</ref> XTs with 240&nbsp;V-compatible power supplies were later sold in international markets. Both were rated at 130 watts.<ref name="sim62" />

==Revisions and variants==
[[File:IBM PC XT 5160.JPG|thumb|IBM PC/XT 5160 dual floppy drives with 5153 Color Monitor]]
IBM made several submodels of the XT.

The [[Engineering:IBM 3270 PC|3270 PC]], a variant of the XT featuring 3270 terminal emulation, was released in October 1983.

Submodel 068 and 078, released in 1985, offered dual-floppy configurations without a hard drive as well, and the new [[Enhanced Graphics Adapter]] and Professional Graphics Adapter became available as video card options.<ref name="Mueller92" />

In 1986, the 256–640 KB motherboard models were launched, which switched to half-height drives.

Submodels 268, 278 and 089 came with 101-key [[Engineering:IBM PC keyboard|keyboards]] (essentially the IBM Model M, but in a modified variant that used the XT's keyboard protocol and lacked LEDs).

Submodels 267, 277 and 088 had the original keyboard, but 3.5" floppy drives became available and 20MB Seagate ST-225 hard disks in 5.25" half-height size replaced the full-height 10&nbsp;MB drives.

Submodel 788 was the only XT sold with the [[Color Graphics Adapter]] as a standard feature.<ref name="sim62" />

Submodels 568, 588, and 589 were used as basis for the XT/370; they had an additional (co-)processor board that could execute System/370 instructions.<ref name="sim62">Personal Computer Family Service Information Manual (January 1989), IBM document SA38-0037-00, page 6-2</ref> An XT-based machine with a Series/1 co-processor board existed as well, but it had its own System Unit number, the IBM 4950.<ref>Personal Computer Family Service Information Manual (January 1989), IBM document SA38-0037-00, page 14-1</ref>

=== XT 286 {{anchor|IBM XT 286}} ===
{{plain image with caption|IBM Personal Computer XT 286 badge recreation.svg|upright=0.5|caption=XT 286 badge}}
In 1986, the '''XT 286''' (model 5162) was released with a 6&nbsp;MHz [[Engineering:Intel 80286|Intel 80286]] processor. Despite being marketed as a lower-tier model than the IBM AT, this system runs many applications faster than the ATs of the time with 6&nbsp;MHz 286 processors, since it has zero-[[Wait state|wait state]] RAM.<ref name="Mueller92" />{{rp|95}}

It shipped with 640&nbsp;KB RAM standard, an AT-style 1.2&nbsp;MB high-density diskette drive and a 20&nbsp;MB hard disk.<ref name="sim81">Personal Computer Family Service Information Manual (January 1989), IBM document SA38-0037-00, pages 8-1 to 8-2</ref><ref>[https://books.google.com/books?id=NZrPkWywRXgC&pg=PA155 "The AT Clone from IBM"], ''PC Magazine'', January 13, 1987</ref> Despite these features, reviews rated it as a poor market value.<ref name="Inc.1987">{{cite book|url=https://archive.org/details/bub_gb_yjAEAAAAMBAJ|title=InfoWorld|date=March 23, 1987|publisher=InfoWorld Media Group, Inc.|pages=[https://archive.org/details/bub_gb_yjAEAAAAMBAJ/page/n48 49]|issn=0199-6649}}</ref>

The XT 286 uses a 157-watt power supply, which can internally switch between 115 or 230&nbsp;V AC operation.<ref name="sim81" />

{{anchor|End of life}}Both the original XT and the XT/286 was discontinued in late 1987 after the launch of the IBM Personal System/2 (PS/2) line. The 8086-powered IBM PS/2 Model 30 served as the direct replacement for the XT in that PS/2 line. Unlike higher-end entries in the PS/2 line, which feature the [[Engineering:Micro Channel architecture|Micro Channel]] expansion bus, the Model 30 contains 8-bit ISA bus slots, exactly like the XT.

===Comparison table===
{{table alignment}}
{{sort-under}}
{| class="wikitable sortable sticky-header sort-under col3right col4right col12right"
|-
|+ IBM Personal Computer XT models
! {{verth|va=middle|Type}}
! {{verth|va=middle|IBM {{abbr|P/N|part number}}}}
! Date announced
! Date withdrawn
! Bus
! {{verth|va=middle|{{abbr|No.|Number}} of slots}}
! {{verth|va=middle|{{abbr|No.|Number}} of bays}}
! Processor         
! {{verth|va=middle|Clock speed<br />{{small|(MHz)}}}}
! {{verth|va=middle|Stock onboard RAM<br />{{small|(KB)}}}}
! {{verth|va=middle|Maximum onboard RAM<br />{{small|(KB)}}}}
! {{abbr|FDD|Floppy disk drive}}
! {{abbr|HDD|Hard disk drive}}
! Notes
! Ref(s).
|-
| {{verth|va=middle|XT}}
| {{verth|va=middle|5160-087}}
| {{date table sorting|1983|03|08|format=my}}
| {{date table sorting|1984|06|19|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 128&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| 10&nbsp;MB
| &nbsp;
| {{grid list|columns=2|<ref name=ibmref40>{{cite book | date=April 6, 1987 | url=https://bitsavers.org/pdf/ibm/pc/PS2_and_IBM_PC_Product_Reference_Version_4.0_Apr87.pdf#page=244 | title=IBM Personal System/2 and IBM Personal Computer Product Reference | edition=4.0 | publisher=International Business Machines Corporation | via=Bitsavers}}</ref>{{rp|236}}|<ref name=firstshoe>{{cite journal | last=Sandler | first=Corey | date=April 1983 | url=https://books.google.com/books?id=7wCiNAUEuAMC&pg=RA2-PA90 | title=IBM Drops the First Shoe | journal=PC Magazine | publisher=Ziff-Davis | volume=1 | issue=12 | pages=90–102 | via=Google Books}}</ref>|<ref name=mueller4ed>{{cite book | last=Mueller | first=Scott | date=1994 | url=https://archive.org/details/upgradingrepairi00muel_7/page/1208/ | title=Upgrading and Repairing PCs | publisher=Que | edition=4th | isbn=9781565299320 | via=the Internet Archive}}</ref>{{rp|1068}}}}
|-
| {{verth|va=middle|XT}}
| {{verth|va=middle|5160-086}}
| {{date table sorting|1984|06|19|format=my}}
| {{date table sorting|1987|06|30|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 256&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| 10&nbsp;MB
| &nbsp;
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|236}}|<ref name=ibmslashes>{{cite journal | last=Staff writer | date=June 11, 1984 | url=https://link.gale.com/apps/doc/A554458/GPS?sid=wikipedia | title=IBM Slashes PC Prices, Adds Memory; Drops 64KB | journal=Electronic News | publisher= Sage Publications | volume=30 | issue=1501 | page=24 | via=Gale}}</ref>|<ref name=optimistic>{{cite journal | last=Sanger | first=David E. | date=June 24, 1987 | url=https://www.proquest.com/docview/426534977/ | title=I.B.M. Optimistic on Newest PC's | journal=The New York Times | page=D4 | id={{ProQuest|426534977}}}}</ref>|<ref name=bridgesetal />}}
|-
| {{verth|va=middle|XT}}
| {{verth|va=middle|5160-068}}
| {{date table sorting|1985|04|02|format=my}}
| {{date table sorting|1987|06|30|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 256&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| {{CNone|none}}
| &nbsp;
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|236}}|<ref name=mueller4ed />{{rp|1068}}|<ref name=sager>{{cite journal | last=Sager | first=Ira | date=April 8, 1985 | url=https://link.gale.com/apps/doc/A3723060/GPS?sid=wikipedia | title=IBM moves to reduce PC XT inventories | journal=Electronic News | publisher=Sage Publications | volume=31 | pages=24 ''et seq'' | via=Gale | quote=The new floppy disk-based versions of the PC XT basically just strips the 10MB hard disk from the earlier unit. The machines come with base memory of 256KB and are available in either single or dual 360 KB diskette versions. A single diskette unit with keyboard and 256 KB of main memory is priced at $2,270, while the dual diskette version is priced at $2,570. A fully configured PC XT with 256 KB of RAM, a 360 KB diskette, keyboard, monochrome monitor and adapter, and operating system comes in at about $2,860.}}</ref>|<ref name=optimistic />|<ref name=bridgesetal />}}
|-
| {{verth|va=middle|XT}}
| {{verth|va=middle|5160-078}}
| {{date table sorting|1985|04|02|format=my}}
| {{date table sorting|1987|06|30|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 256&nbsp;KB
| 640&nbsp;KB
| two 360&nbsp;KB
| {{CNone|none}}
| &nbsp;
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|236}}|<ref name=mueller4ed />{{rp|1068}}|<ref name=sager />|<ref name=optimistic />|<ref name=bridgesetal />}}
|-
| {{verth|va=middle|XT}}
| {{verth|va=middle|5160-088}}
| {{date table sorting|1986|04|02|format=my}}
| {{date table sorting|1987|06|30|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 512&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| 20&nbsp;MB
| Shipped with original IBM PC "Model F" keyboard
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|236}}|<ref name=ibmblitz>{{cite journal | last=Whitmore | first=Sam | date=April 8, 1986 | url=https://link.gale.com/apps/doc/A666904/GPS?sid=wikipedia | title=Product blitz may signal more aggressive IBM: firm ups ante for the makers of compatibles | journal=PC Week | publisher=Ziff-Davis | volume=3 | issue=14 | page=1 | via=Gale}}</ref>|<ref name=optimistic />|<ref name=bridgesetal />}}
|-
| {{verth|va=middle|XT}}
| {{verth|va=middle|5160-089}}
| {{date table sorting|1986|04|02|format=my}}
| {{date table sorting|1987|06|30|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 512&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| 20&nbsp;MB
| Shipped with Enhanced Keyboard
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|236}}|<ref name=ibmblitz />|<ref name=optimistic />|<ref name=bridgesetal />}}
|-
| {{verth|va=middle|XT}}
| {{verth|va=middle|5160-267}}
| {{date table sorting|1986|04|02|format=my}}
| {{date table sorting|1987|06|30|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 256&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| {{CNone|none}}
| Shipped with original IBM PC "Model F" keyboard
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|236}}|<ref name=ibmblitz />|<ref name=optimistic />|<ref name=bridgesetal />}}
|-
| {{verth|va=middle|XT}}
| {{verth|va=middle|5160-268}}
| {{date table sorting|1986|04|02|format=my}}
| {{date table sorting|1987|06|30|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 256&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| {{CNone|none}}
| Shipped with Enhanced Keyboard
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|236}}|<ref name=ibmblitz />}}
|-
| {{verth|va=middle|XT}}
| {{verth|va=middle|5160-277}}
| {{date table sorting|1986|04|02|format=my}}
| {{date table sorting|1987|06|30|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 256&nbsp;KB
| 640&nbsp;KB
| two 360&nbsp;KB
| {{CNone|none}}
| Shipped with original IBM PC "Model F" keyboard
| {{grid list|columns=2|<ref name=ibmblitz />}}
|-
| {{verth|va=middle|XT}}
| {{verth|va=middle|5160-278}}
| {{date table sorting|1986|04|02|format=my}}
| {{date table sorting|1987|06|30|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 256&nbsp;KB
| 640&nbsp;KB
| two 360&nbsp;KB
| {{CNone|none}}
| Shipped with Enhanced Keyboard
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|236}}|<ref name=ibmblitz />}}
|-
| {{verth|va=middle|[[Engineering:IBM 3270 PC|3270 PC]]}}
| {{verth|va=middle|5271-000}}
| {{unknown}}
| {{date table sorting|1987|07|02|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 256&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| {{CNone|none}}
| Without printer adapter, fixed disk adapter, and keyboard
| {{grid list|columns=2|<ref>{{cite journal | date=January 1984 | url=http://www.bitsavers.org/pdf/datapro/programmable_terminals/Datapro_C21_IBM.pdf#page=62 | title=IBM 3770 Family Batch Communications Terminals | journal=Distributed Processing & Intelligent Terminals | publisher=Datapro | page=C21-491-101 | via=Bitsavers.org}}</ref>|<ref name=libes>{{cite journal | last=Libes | first=Sol | date=February 28, 1984 | url=https://link.gale.com/apps/doc/A3150465/GPS?sid=wikipedia | title=3270 emulation board makers, beware! IBM is aiming at you | journal=PC Week | publisher=Ziff-Davis | volume=1 | issue=28 | pages=25 ''et seq'' | via=Gale}}</ref>}}
|-
| {{verth|va=middle|[[Engineering:IBM 3270 PC|3270 PC]]}}
| {{verth|va=middle|5271-002}}
| {{date table sorting|1983|10|format=my}}
| {{date table sorting|1987|07|02|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 256&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| {{CNone|none}}
| Without printer adapter and fixed disk adapter
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|49}}|<ref name=ibmslashes />|<ref name=ibm3270announcement>{{cite journal | last=Henkel | first=T. | date=October 24, 1983 | url=https://books.google.com/books?id=wFqbDqPhSMcC&pg=PA1 | title=IBM Takes Wraps off Two Micros Capable of Accessing Mainframes | journal=Computerworld | publisher=IDG Publications | volume=17 | issue=43 | pages=1, 10 | via=Google Books}}</ref>{{rp|10}}|<ref name=libes />}}
|-
| {{verth|va=middle|[[Engineering:IBM 3270 PC|3270 PC]]}}
| {{verth|va=middle|5271-004}}
| {{date table sorting|1983|10|format=my}}
| {{date table sorting|1987|07|02|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 320&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| {{CNone|none}}
| Without fixed disk adapter; stock onboard RAM increased to 384&nbsp;KB in June 1984
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|49}}|<ref name=ibmslashes />|<ref name=ibm3270announcement />{{rp|10}}|<ref name=libes />}}
|-
| {{verth|va=middle|[[Engineering:IBM 3270 PC|3270 PC]]}}
| {{verth|va=middle|5271-006}}
| {{date table sorting|1983|10|format=my}}
| {{date table sorting|1987|07|02|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 320&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| 10&nbsp;MB
| With fixed disk adapter; stock onboard RAM increased to 384&nbsp;KB in June 1984
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|49}}|<ref name=ibmslashes />|<ref name=ibm3270announcement />{{rp|10}}|<ref name=libes />}}
|-
| {{verth|va=middle|XT/370}}
| {{verth|va=middle|5160-568}}
| {{date table sorting|1984|10|25|format=my}}
| {{date table sorting|1987|04|02|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 256&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| {{CNone|none}}
|
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|236}}|<ref name=ibm3270announcement />|<ref name=givesup>{{cite journal | date=April 13, 1987 | url=https://techmonitor.ai/technology/ibm_gives_up_on_the_personal_xt_at370 | title=IBM Gives Up on the Personal XT/, AT/370 | journal=Computer Business Review | publisher=New Statesman Media Group | archiveurl=https://archive.today/20230920021426/https://techmonitor.ai/technology/ibm_gives_up_on_the_personal_xt_at370 | archivedate=September 20, 2023}}</ref>}}
|-
| {{verth|va=middle|XT/370}}
| {{verth|va=middle|5160-588}}
| {{date table sorting|1984|10|25|format=my}}
| {{date table sorting|1987|04|02|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 256&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| 10&nbsp;MB
|
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|236}}|<ref name=ibm3270announcement />|<ref name=givesup />}}
|-
| {{verth|va=middle|XT/370}}
| {{verth|va=middle|5160-589}}
| {{date table sorting|1984|10|25|format=my}}
| {{date table sorting|1987|04|02|format=my}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>8-bit
| 8
| 2
| [[Engineering:Intel 8088|Intel 8088]]
| 4.77
| 256&nbsp;KB
| 640&nbsp;KB
| 360&nbsp;KB
| 10&nbsp;MB
|
| {{grid list|columns=2|<ref name=ibmref40 />{{rp|236}}|<ref name=givesup />}}
|-
| {{verth|va=middle|XT Model 286}}
| {{verth|va=middle|5162-286}}
| {{date table sorting|1986|09|02|format=my}}
| {{date table sorting|1987|10}}
| [[Engineering:Industry Standard Architecture|ISA]],<br/>16-bit
| 8
| 2
| [[Engineering:Intel 80286|Intel 80286]]
| 6
| 640&nbsp;KB
| 640&nbsp;KB
| 1.2&nbsp;MB
| 20&nbsp;MB
| &nbsp;
|}

==Reception==
The XT was well received, although PC DOS 2.0 was regarded as a greater improvement than any of the hardware changes, and by the end of 1983 IBM was selling every unit they made.<ref>{{cite news|last=Archer |first=Rowland Jr.|date=November 1983|title=The IBM PC XT and DOS 2.00|pages=294–304|work=BYTE|url=https://archive.org/stream/byte-magazine-1983-11/1983_11_BYTE_08-11_Inside_the_IBM_PC#page/n301/mode/2up|access-date=May 14, 2021}}</ref> By 1985 the IBM PC AT made the XT obsolete for most customers.<ref name="pournelle198501">{{Cite magazine |last=Pournelle |first=Jerry |date=January 1985 |title=The Fast Lane |url=https://archive.org/details/BYTE_Vol_10-01_1985-01_Through_The_Hourglass/page/363/mode/1up?view=theater |access-date=2024-10-04 |magazine=BYTE |page=363}}</ref>

==Timeline==
{{Timeline of the IBM Personal Computer}}

==See also==
* [[Biology:Amiga Sidecar|Amiga Sidecar]]
* [[Engineering:PC-based IBM-compatible mainframes#Personal Computer XT/370|PC-based IBM-compatible mainframes]]

==References==
{{reflist}}
;Notes
{{refbegin}}
* IBM (1983). ''Personal Computer Hardware Reference Library: Guide to Operations, Personal Computer XT''. IBM Part Number 6936831.
{{refend}}

==External links==
* [http://www.minuszerodegrees.net IBM 5160 information at www.minuszerodegrees.net]
Photo galleries:
* [http://www.supervinx.com/OnlineMuseum/IBM/5160/04/ XT with 256&nbsp;KB on system board]
* [http://www.supervinx.com/OnlineMuseum/IBM/5162/02/ XT 286]

{{IBM personal computers}}

[[Category:16-bit computers]]

{{Sourceattribution|IBM Personal Computer XT}}