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</style><table class="infobox vevent"><tbody><tr><th colspan="2" class="infobox-above" style="background-color: #e0e0e0;">4690 Operating System</th></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Programmer" title="Programmer">Developer</a></th><td class="infobox-data">(<a href="Digital_Research" title="Digital Research">Digital Research</a>, <a href="Novell" title="Novell">Novell</a>, <a href="Intelligent_Micro_Software" class="mw-redirect" title="Intelligent Micro Software">IMS</a>) <a href="IBM" title="IBM">IBM</a>, <a href="Toshiba" title="Toshiba">Toshiba</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Programming_language" title="Programming language">Written in</a></th><td class="infobox-data"><a href="C_(programming_language)" title="C (programming language)">C</a><br>Supported languages: IBM 4680 <a href="CBASIC" title="CBASIC">BASIC</a>,<br>Metaware High-<a href="C_(programming_language)" title="C (programming language)">C</a>,<br><a href="Java_(programming_language)" title="Java (programming language)">Java</a> 2</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Working state</th><td class="infobox-data">Abandoned</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Source model</th><td class="infobox-data"><a href="Proprietary_software" title="Proprietary software">Proprietary</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Initial release</th><td class="infobox-data">July 1993<span style="display:none"> (<span class="bday dtstart published updated">1993-07</span>)</span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_release_life_cycle" title="Software release life cycle">Final release</a></th><td class="infobox-data">6.5 / January 2016<span style="display:none"> (<span class="bday dtstart published updated">2016-01</span>)</span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Marketing target</th><td class="infobox-data"><a href="Point_of_sale" title="Point of sale">Point of sale</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Available in</th><td class="infobox-data"><a href="English_language" title="English language">English</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Package_manager" title="Package manager">Package manager</a></th><td class="infobox-data">Proprietary ASM (Apply Software Maintenance) System</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Supported platforms</th><td class="infobox-data"><a href="Point_of_sale" title="Point of sale">Point of sale</a> terminals</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Kernel_(operating_system)" title="Kernel (operating system)">Kernel</a> type</th><td class="infobox-data"><a href="Real-time_operating_system" title="Real-time operating system">Real-time operating system</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="User_interface" title="User interface">Default<br>user interface</a></th><td class="infobox-data"><a href="Command-line_interface" title="Command-line interface">Command-line interface</a>, some screens spawn a Java-based <a href="Graphical_user_interface" title="Graphical user interface">graphical user interface</a> (GUI)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_license" title="Software license">License</a></th><td class="infobox-data"><a href="Proprietary_software" title="Proprietary software">Proprietary</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Preceded by</th><td class="infobox-data"><a href="FlexOS" title="FlexOS">FlexOS</a> 386, <a href="4680_OS" class="mw-redirect" title="4680 OS">4680 OS</a>, <a href="REAL/32" class="mw-redirect" title="REAL/32">REAL/32</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Succeeded by</th><td class="infobox-data">TCx Sky v1.1</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Official website</th><td class="infobox-data"><a rel="nofollow" class="external text" href="https://commerce.toshiba.com/wps/portal/marketing/?urile=wcm:path:/en-us/home/software/operating-systems">Toshiba Commerce: Operating Systems</a></td></tr></tbody></table>

<p><b>4690 Operating System</b> (sometimes shortened to <b>4690 OS</b> or <b>4690</b>) is a specially designed <a href="Point_of_sale" title="Point of sale">point of sale</a> (POS) <a href="Operating_system" title="Operating system">operating system</a>, originally sold by <a href="IBM" title="IBM">IBM</a>. In 2012, IBM sold its retail business, including this product, to <a href="Toshiba" title="Toshiba">Toshiba</a>, which assumed support.<sup id="cite_ref-IBM_2010_4690_1-0" class="reference"><a href="#cite_note-IBM_2010_4690-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> 4690 is widely used by IBM and Toshiba retail customers to run retail systems which run their own applications and others. Retailers have used the 4690 Operating System for their operations because of its many retail-specific and reliability features. In addition to running on IBM hardware, third-party vendors have exploited the 4690 features on competitive hardware.

</p>

<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>

<p>4690 is the successor product to IBM <a href="4680_OS" class="mw-redirect" title="4680 OS">4680 OS</a>, which was in use by IBM customers since 1986.<sup id="cite_ref-Novell_2005_Linux_2-0" class="reference"><a href="#cite_note-Novell_2005_Linux-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The original 4680 OS was based on <a href="Digital_Research" title="Digital Research">Digital Research</a>'s <a href="Concurrent_DOS_286" class="mw-redirect" title="Concurrent DOS 286">Concurrent DOS 286</a>,<sup id="cite_ref-CBR_1987_FlexOS-286_3-0" class="reference"><a href="#cite_note-CBR_1987_FlexOS-286-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> a system thereafter renamed to <a href="FlexOS_286" class="mw-redirect" title="FlexOS 286">FlexOS 286</a> in November 1986. In July 1993,<sup id="cite_ref-Novell_2005_Linux_2-1" class="reference"><a href="#cite_note-Novell_2005_Linux-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> IBM adopted <a href="FlexOS" title="FlexOS">FlexOS</a> version 2.32 as the basis of their 4690 OS version 1.<sup id="cite_ref-IBM_2010_4690_1-1" class="reference"><a href="#cite_note-IBM_2010_4690-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-IBM_1993_4690_4-0" class="reference"><a href="#cite_note-IBM_1993_4690-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> FlexOS 2.32 supported <i>286</i> (<a href="Intel_80286" title="Intel 80286">Intel 80286</a>) and <i>386</i> (<a href="I386" title="I386">Intel 80386</a>) modes and had no limit on applications running <a href="Concurrent_computing" title="Concurrent computing">concurrently</a>. In 1995, IBM licensed IMS <a href="REAL/32" class="mw-redirect" title="REAL/32">REAL/32</a> 7.50, a derivative of Digital Research's <a href="Multiuser_DOS" title="Multiuser DOS">Multiuser DOS</a> and thereby a successor to <a href="Concurrent_DOS_386" class="mw-redirect" title="Concurrent DOS 386">Concurrent DOS 386</a>, to bundle it with their 4695 POS terminals.<sup id="cite_ref-IMS_1995_REAL32_5-0" class="reference"><a href="#cite_note-IMS_1995_REAL32-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>

</p><p>According to the article "The Year of the Store?", IHL Consulting Group/RIS News, IBM 4690 OS still had a market share of 12% in the POS register <a href="Client_(computing)" title="Client (computing)">client</a> market in June 2005, when IBM was starting to phase it out in favor of <a href="IBM_Retail_Environment_for_SUSE" class="mw-redirect" title="IBM Retail Environment for SUSE">IBM Retail Environment for SUSE</a> (IRES).<sup id="cite_ref-Novell_2005_Linux_2-2" class="reference"><a href="#cite_note-Novell_2005_Linux-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> IBM continued to maintain 4690 OS until April 2015, with the most recent version released by IBM in May 2012 being IBM 4690 OS Version 6 Release 3, which was supported until 2017 under special contracts with big-name companies.

</p><p>Meanwhile, Toshiba has released <i>Toshiba 4690 OS</i> Version 6 Release 4 (V6R4) in January 2014, and Version 6 Release 5 (V6R5) in January 2016. In 2018, a <a href="Linux" title="Linux">Linux</a>-based successor of 4690 OS, named <i>TCx Sky</i> and codeveloped with <a href="Wind_River_Systems" title="Wind River Systems">Wind River Systems</a>, was launched. Soon after, Toshiba discontinued 4690 OS for new customers; it is, however, still supported under service contracts signed between Toshiba Global Commerce Solutions and stores still using 4690 OS on their POS terminals. The latest security update (CSD Level 2010) was released in December 2020, only for 4690 OS Version 6 Release 5.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="Supported_hardware">Supported hardware</h2></div>

<p>4690 supports many POS terminal devices, store controller <a href="Server_(computing)" title="Server (computing)">servers</a>, and combination controller–terminals. The 4690 documentation contains a list of supported POS devices, some in use over 20 years. The family of IBM Universal Serial Bus (<a href="USB" title="USB">USB</a>) POS devices that 4690 supports includes keyboards, displays, and <a href="Cash_drawer" class="mw-redirect" title="Cash drawer">cash drawers</a>. 4690 also supports other <a href="Input/output" title="Input/output">input/output</a> (I/O) devices designed and conforming to IBM's USB POS device interface specifications. IBM makes interface specifications available to third-party vendors to enable them to connect their devices to POS terminals using <a href="RS-485" title="RS-485">RS-485</a>, <a href="RS-232" title="RS-232">RS-232</a>, and USB connections.

</p><p>IBM provides a <i>Controller Matrix</i> document with a list of compatible IBM servers for use with 4690 OS as store controllers and controller–terminals. These servers represent current and formerly available devices which continue to be supported by 4690.

</p>

<div class="mw-heading mw-heading2"><h2 id="Notable_features">Notable features</h2></div>

<p>Perhaps the most notable feature of the 4690 OS is its ability to provide a "redundancy infrastructure". IBM designed the 4690 OS to work either as one server, or with one or more other 4690 servers. These servers are commonly called <i>store controllers</i>. When connected in a <a href="Local_area_network" title="Local area network">local area network</a> (LAN), these 4690 store controllers provide redundant backup using mirrored data files. Using a system of <i>master controller</i>, <i>alternate master</i>, <i>file server</i>, and <i>alternate file server</i> designations, the controllers preserve data integrity and allow file backup in case a store controller fails and needs to be replaced.

</p><p>A copy of the 4690 OS is maintained in each store controller. The 4690 POS terminals (registers) load a copy of 4690 from the store controller into memory when they <a href="Initial_Program_Load" class="mw-redirect" title="Initial Program Load">Initial Program Load</a> (IPL). The 4690 controllers provide terminal support in the form of terminal loading, price lookup, and transaction logging. <a href="Non-volatile_memory" title="Non-volatile memory">Non-volatile memory</a> is used to ensure that data is not lost in transit from the terminals to the store controller. Terminals are assigned to a primary store controller, and that controller is typically backed up by another controller. If the primary controller fails, the terminals automatically access the backup controller, providing uninterrupted sales at the POS terminal. If both the primary and backup controllers are unavailable, the terminal can go into a standalone state, or, some of the applications are able to support a <i>Terminal Offline</i> (TOF) state wherein terminals run offline using a terminal-based item file and logging stored in their own memory.

</p><p>To maintain software at the store level, 4690 OS provides a <i>software maintenance facility</i> to manage updates. This facility provides checking to ensure that all updates have been transferred to the store, and the ability to apply the maintenance from store level commands or under central control. The updated software can be applied in <i>test</i>, which preserves the prior software in case the maintenance needs to be backed off for some reason.

</p><p>4690 supports communications to the store controller in several forms. including <a href="TCP/IP" class="mw-redirect" title="TCP/IP">TCP/IP</a>, <a href="X.25" title="X.25">X.25</a>, <a href="Systems_Network_Architecture" title="Systems Network Architecture">Systems Network Architecture</a> (SNA), and asynchronous communications.

</p>

<div class="mw-heading mw-heading3"><h3 id="Commands">Commands</h3></div>

<p>The following list of <a href="Command_(computing)" title="Command (computing)">commands</a> are supported by the 4690 Operating System.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup>

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<ul><li><a href="ASSIGN_(DOS_command)" class="mw-redirect" title="ASSIGN (DOS command)">ASSIGN</a></li>

<li><a href="BACKUP_(DOS_command)" class="mw-redirect" title="BACKUP (DOS command)">BACKUP</a></li>

<li><a href="Batch_file" title="Batch file">BATCH</a></li>

<li><a href="BREAK_(DOS_command)" class="mw-redirect" title="BREAK (DOS command)">BREAK</a></li>

<li><a href="Optical_disc_authoring" title="Optical disc authoring">BURNISO</a></li>

<li><a href="Cd_(command)" title="Cd (command)">CHDIR</a></li>

<li><a href="CHKDSK" title="CHKDSK">CHKDSK</a></li>

<li><a href="COMMAND.COM" title="COMMAND.COM">COMMAND</a></li>

<li>DEFINE</li>

<li><a href="Diskcomp" title="Diskcomp">DISKCOMP</a></li>

<li><a href="Diskcopy" title="Diskcopy">DISKCOPY</a></li>

<li><a href="Del_(command)" title="Del (command)">ERASE</a></li>

<li>FCOPY</li>

<li><a href="Format_(command)" title="Format (command)">FORMAT</a></li>

<li><a href="Mkdir" title="Mkdir">MKDIR</a></li>

<li>ORDER</li>

<li><a href="PAUSE_(DOS_command)" class="mw-redirect" title="PAUSE (DOS command)">PAUSE</a></li>

<li><a href="Print_(command)" class="mw-redirect" title="Print (command)">PRINT</a></li>

<li><a href="PROMPT_(DOS_command)" class="mw-redirect" title="PROMPT (DOS command)">PROMPT</a></li>

<li>QUERY</li>

<li><a href="Ren_(command)" title="Ren (command)">RENAME</a></li>

<li><a href="RESTORE_(DOS_command)" class="mw-redirect" title="RESTORE (DOS command)">RESTORE</a></li>

<li><a href="Rmdir" title="Rmdir">RMDIR</a></li>

<li>SECURITY</li>

<li><a href="SHIFT_(DOS_command)" class="mw-redirect" title="SHIFT (DOS command)">SHIFT</a></li>

<li>UNLOCKP</li>

<li><a href="VERIFY_(DOS_command)" class="mw-redirect" title="VERIFY (DOS command)">VERIFY</a></li>

</div>

<div class="mw-heading mw-heading2"><h2 id="Technology_and_software">Technology and software</h2></div>

<p>4690 OS has been updated annually to address the needs of its user community and in anticipation of upcoming requirements.

</p><p>4690 Version 5 incorporated new security enhancements, such as <a href="Secure_Shell" title="Secure Shell">Secure Shell</a> (SSH), <a href="IPsec" title="IPsec">IPsec</a>, and enhanced operator security (allowing alphanumeric operator IDs, password complexity requirements, password expiration, etc.). This has helped its users address new security requirements from the credit card companies.

</p><p>Another recent addition to 4690 was the ability to forward store hardware- and software-level events to a Remote Management system to facilitate central control and monitoring. File integrity monitoring and lockdown of 4690s are becoming increasingly important due to recent breaches caused by <a href="Point-of-sale_malware" title="Point-of-sale malware">point-of-sale malware</a> based threats.

</p><p>4690 supports applications written in a <a href="CBASIC" title="CBASIC">CBASIC</a> variant named IBM 4680 BASIC, Metaware High-<a href="C_(programming_language)" title="C (programming language)">C</a>, and <a href="Java_(programming_language)" title="Java (programming language)">Java</a> 2. The Java language-based ability at both the server and the client, along with the extension of <a href="Internet_protocol_suite" title="Internet protocol suite">Internet protocol suite</a> TCP/IP ability to the client, enables Java applications at both the server and client to run concurrently with extant CBASIC or C applications. Users can make functional enhancements to extant applications by developing a new Java application that communicates with an extant application.

</p><p>

</p>

<div class="mw-heading mw-heading2"><h2 id="Versions">Versions</h2></div>

<p>IBM 4690 Operating System versions:

</p>

<li>2 release 1</li>

<li>2 release 2</li>

<li>2 release 3</li>

<li>2 release 4</li>

<li>3 release 1</li>

<li>3 release 2</li>

<li>3 release 3</li>

<li>4 release 1</li>

<li>4 release 2</li>

<li>5 release 1</li>

<li>5 release 2</li>

<li>6 release 1</li>

<li>6 release 2</li>

<li>6 release 3 (May 2012)</li></ul>

<p>Toshiba 4690 Operating System versions:

</p>

<ul><li>6 release 4 (January 2014)</li>

<li>6 release 5 Classic – Enhanced (January 2016)<sup id="cite_ref-Toshiba_2016_V6R5_8-0" class="reference"><a href="#cite_note-Toshiba_2016_V6R5-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup></li></ul>

<ul><li><a href="Digital_Research" title="Digital Research">Digital Research</a></li>

<li>Toshiba TCx Sky</li>

<li><a href="FlexOS" title="FlexOS">FlexOS</a></li>

<li><a href="IBM_Retail_Environment_for_SUSE" class="mw-redirect" title="IBM Retail Environment for SUSE">IBM Retail Environment for SUSE</a> (IRES)</li>

<li><a href="Distributed_Data_Management_Architecture" title="Distributed Data Management Architecture">Distributed Data Management Architecture</a> (DDM)</li></ul>

<div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2></div>

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</style><cite class="citation book cs1"><span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://public.dhe.ibm.com/software/retail/pubs/sw/opsys/4690/ver6r2/hak0_4690_v6r2_pg_mst.pdf"><i>IBM 4690 OS V6.2 Programming Guide</i></a></span> <span class="cs1-format">(PDF)</span>. IBM<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-03-01</span></span>.</cite></li>

<li><cite class="citation book cs1"><span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://public.dhe.ibm.com/software/retail/pubs/sw/opsys/4690/ver6r2/hah0_4690_v6r2_picg_mst.pdf"><i>IBM 4690 OS V6.2 Configuration Guide (English)</i></a></span> <span class="cs1-format">(PDF)</span>. IBM<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-03-01</span></span>.</cite></li>

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<li><cite class="citation book cs1"><span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://public.dhe.ibm.com/software/retail/pubs/sw/opsys/4690/ver6r2/haj0_4690_v6r2_mg_mst.pdf"><i>IBM 4690 OS V6.2 Messages Guide</i></a></span> <span class="cs1-format">(PDF)</span>. IBM<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-03-01</span></span>.</cite></li>

<li><cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20220125063705/ftp://ftp.software.ibm.com/software/retail/pubs/sw/opsys/4690/ver5r2/bsi1_PG_mst.pdf"><i>IBM 4690 OS V5.2 Programming Guide</i></a> <span class="cs1-format">(PDF)</span>. IBM. Archived from <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://public.dhe.ibm.com/software/retail/pubs/sw/opsys/4690/ver5r2/bsi1_PG_mst.pdf">the original</a></span> <span class="cs1-format">(PDF)</span> on 2022-01-25<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-03-01</span></span>.</cite></li>

<li><cite class="citation book cs1"><span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://public.dhe.ibm.com/software/retail/pubs/sw/opsys/4690/ver5r2/bse1_PIC_mst.pdf"><i>IBM 4690 OS V5.2 Configuration Guide (English)</i></a></span> <span class="cs1-format">(PDF)</span>. IBM<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-03-01</span></span>.</cite></li>

<li><cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20220125063641/ftp://ftp.software.ibm.com/software/retail/pubs/sw/opsys/4690/ver5r2/bsf1_UG_mst.pdf"><i>IBM 4690 OS V5.2 User's Guide (English)</i></a> <span class="cs1-format">(PDF)</span>. IBM. Archived from <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://public.dhe.ibm.com/software/retail/pubs/sw/opsys/4690/ver5r2/bsf1_UG_mst.pdf">the original</a></span> <span class="cs1-format">(PDF)</span> on 2022-01-25<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-03-01</span></span>.</cite></li>

<li><cite class="citation book cs1"><span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://public.dhe.ibm.com/software/retail/pubs/sw/opsys/4690/ver5r2/bsh1_CPR_mst.pdf"><i>IBM 4690 OS V5.2 Communications Programming Guide</i></a></span> <span class="cs1-format">(PDF)</span>. IBM<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-03-01</span></span>.</cite></li>

<li><cite class="citation book cs1"><span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://public.dhe.ibm.com/software/retail/pubs/sw/opsys/4690/ver5r2/bsg1_MG_mst.pdf"><i>IBM 4690 OS V5.2 Messages Guide</i></a></span> <span class="cs1-format">(PDF)</span>. IBM<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-03-01</span></span>.</cite></li>

<li><cite class="citation book cs1"><span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://public.dhe.ibm.com/software/retail/pubs/sw/opsys/4690/ver4r1/sco9mst.pdf"><i>IBM 4690 OS V4.1 IBM 4680 BASIC Language Reference</i></a></span> <span class="cs1-format">(PDF)</span>. IBM<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-03-01</span></span>.</cite></li></ul>

<p>These and many other documents could be obtained from IBM at the Retail Publications Download Center.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup>

</p><p>In 2016, Toshiba Global Commerce Solutions, the current owner of 4690 OS, removed public access to all 4690 related manuals and publications from their servers.

</p><p>In May 2018, 4690 OS was renamed to TCx Sky. The base operating system that runs under 4690 OS itself was changed to Wind River Linux with this revision.

</p>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><div class="reflist">

<li id="cite_note-IBM_2010_4690-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-IBM_2010_4690_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-IBM_2010_4690_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20110930011638/http://www-03.ibm.com/products/retail/products/software/4690/index.html">"IBM 4690 Operating System"</a>. <a href="IBM" title="IBM">IBM</a>. Archived from <a rel="nofollow" class="external text" href="http://www-03.ibm.com/products/retail/products/software/4690/index.html">the original</a> on 2011-09-30<span class="reference-accessdate">. Retrieved <span class="nowrap">2011-09-06</span></span>.</cite></span>

</li>

<li id="cite_note-Novell_2005_Linux-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-Novell_2005_Linux_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Novell_2005_Linux_2-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Novell_2005_Linux_2-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.novell.com/industries/retail/bestos.pdf">"How to choose the best OS for your point-of-sale"</a> <span class="cs1-format">(PDF)</span>. <i>360Commerce</i>. <a href="Novell" title="Novell">Novell</a>. 2005.</cite> (NB. This PDF has a short history of <a href="Point_of_sale" title="Point of sale">POS</a> operating systems, also mentioning IBM 4680 and IBM 4690.)</span>

</li>

<li id="cite_note-CBR_1987_FlexOS-286-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-CBR_1987_FlexOS-286_3-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFCBR1987" class="citation journal cs1">CBR, ed. (1987-01-15). <a rel="nofollow" class="external text" href="http://www.cbronline.com/news/digital_research_launches_flexos_286_real_time_manufacturing_operating_system">"Digital Research launches FlexOS 286 Real-Time Manufacturing Operating System"</a>. <i>Computer Business Review</i>. <a rel="nofollow" class="external text" href="https://archive.today/20130118190950/http://www.cbronline.com/news/digital_research_launches_flexos_286_real_time_manufacturing_operating_system">Archived</a> from the original on 2013-01-18<span class="reference-accessdate">. Retrieved <span class="nowrap">2018-09-15</span></span>.</cite></span>

</li>

<li id="cite_note-IBM_1993_4690-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-IBM_1993_4690_4-0">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.ibm.com/docs/en/announcements/archive/ENUS293-281">"IBM 4690 Operating System Version 1"</a> (Announcement letter). <a href="IBM" title="IBM">IBM</a>. 1993-06-01. 293-281<span class="reference-accessdate">. Retrieved <span class="nowrap">2025-01-19</span></span>.</cite></span>

</li>

<li id="cite_note-IMS_1995_REAL32-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-IMS_1995_REAL32_5-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFPontin1995" class="citation journal cs1">Pontin, Jason (1995-11-27). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=VzgEAAAAMBAJ&pg=PA28">"IMS offers Real32 OS for application servers"</a>. <i><a href="InfoWorld" title="InfoWorld">InfoWorld</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">2017-01-17</span></span>.</cite></span>

</li>

<li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.toshibacommerce.com/wps/portal/marketing/?urile=wcm:path:/en-us/home/support/support-news">"Support News"</a>. <i>Toshiba Commerce</i>.</cite></span>

</li>

<li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external free" href="https://archive.org/details/4690OSV6r2UsersGuide/page/n169">https://archive.org/details/4690OSV6r2UsersGuide/page/n169</a> </span>

</li>

<li id="cite_note-Toshiba_2016_V6R5-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-Toshiba_2016_V6R5_8-0">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://archive.today/20180916084406/http://tgcs04.toshibacommerce.com/cs/groups/internet/documents/document/dg9z/njyw/~edisp/prod.tos660737.pdf">"Toshiba 4690 Operating System, Version 6 Release 5"</a> <span class="cs1-format">(PDF)</span>. <a href="Toshiba_Corporation" class="mw-redirect" title="Toshiba Corporation">Toshiba Corporation</a>. January 2018. RTD12521-USEN-03. Archived from <a rel="nofollow" class="external text" href="http://tgcs04.toshibacommerce.com/cs/groups/internet/documents/document/dg9z/njyw/~edisp/prod.tos660737.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2018-09-16<span class="reference-accessdate">. Retrieved <span class="nowrap">2018-09-15</span></span>.</cite></span>

</li>

<li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external free" href="https://archive.today/20130103085241/http://www2.clearlake.ibm.com/store/support/html/pubs.html">https://archive.today/20130103085241/http://www2.clearlake.ibm.com/store/support/html/pubs.html</a></span>

</li>

</ol></div></div>

<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><span class="official-website"><span class="url"><a rel="nofollow" class="external text" href="http://commerce.toshiba.com/wps/portal/marketing/?urile=wcm:path:/en-us/home/software/operating-systems">Official website</a></span></span></li>

<li><a rel="nofollow" class="external text" href="https://dfdlschemas.github.io/IBM4690-TLOG/">Data Format Description Language (DFDL) schemas for IBM 4690 ACE</a> to parse and write IBM 4690 ACE transaction logs</li></ul>

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</style><div id="Operating_systems_by_IBM311" style="font-size:114%;margin:0 4em"><a href="Operating_system" title="Operating system">Operating systems</a> by <a href="IBM" title="IBM">IBM</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Supercomputer" title="Supercomputer">Supercomputer</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Red_Hat_Enterprise_Linux" title="Red Hat Enterprise Linux">Red Hat Enterprise Linux</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Server_(computing)" title="Server (computing)">Server</a>, <a href="Mainframe_computer" title="Mainframe computer">mainframe</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="IBM_7090/94_IBSYS" title="IBM 7090/94 IBSYS">IBSYS</a></li>

<li><a href="DOS/360_and_successors" title="DOS/360 and successors">DOS/360 and successors</a>

<li><a href="OS/360_and_successors" title="OS/360 and successors">OS/360 and successors</a>

<li><a href="Stratus_VOS" title="Stratus VOS">System/88 OS</a></li>

<li><a href="Linux_on_IBM_Z" title="Linux on IBM Z">zLinux</a></li>

<li><a href="Special_Real_Time_Operating_System" title="Special Real Time Operating System">SRTOS</a></li>

<li><a href="Red_Hat_Enterprise_Linux" title="Red Hat Enterprise Linux">Red Hat Enterprise Linux</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Desktop_computer" title="Desktop computer">Desktop</a>, <a href="Workstation" title="Workstation">workstation</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Textpack" class="mw-redirect" title="Textpack">Textpack</a></li>

<li><a href="Red_Hat_Enterprise_Linux" title="Red Hat Enterprise Linux">Red Hat Enterprise Linux</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Point_of_sale" title="Point of sale">Point of sale</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

</ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Projects</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Taligent" title="Taligent">Taligent</a></li>

<li><a href="Workplace_OS" title="Workplace OS">Workplace OS</a></li>

<li><a href="Project_Monterey" title="Project Monterey">Monterey</a></li>

<li><a href="Project_Trillian" class="mw-redirect" title="Project Trillian">Trillian</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Fedora_Linux" title="Fedora Linux">Fedora Linux</a></li></ul>

</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> Category</div></td></tr></tbody></table></div>

<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Real-time_operating_systems_(RTOS)556" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Real-time_operating_systems_(RTOS)556" style="font-size:114%;margin:0 4em"><a href="Real-time_operating_system" title="Real-time operating system">Real-time operating systems</a> (RTOS)</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Operating_system" title="Operating system">Operating<br>systems</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="POSIX" title="POSIX">POSIX</a> support</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Unix-like" title="Unix-like">Unix-like</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Junos_OS" title="Junos OS">Junos OS</a></li>

<li><a href="LynxOS" title="LynxOS">LynxOS</a></li>

<li><i><a href="Multi-Environment_Real-Time" title="Multi-Environment Real-Time">Multi-Environment Real-Time</a></i>^ (<i>MERT</i> – <i>Unix-RT</i>)</li>

<li><a href="Real-Time_Linux" class="mw-redirect" title="Real-Time Linux">Real-Time Linux</a>°</li>

<li><a href="RTLinux" title="RTLinux">RTLinux</a>°</li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="LiteOS" title="LiteOS">LiteOS</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><i><a href="LiteOS" title="LiteOS">LiteOS</a></i>°</li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Partial</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><i><a href="ChorusOS" title="ChorusOS">ChorusOS</a></i>^</li>

<li><a href="Integrity_(operating_system)" title="Integrity (operating system)">Integrity</a>^</li>

<li><a href="Nucleus_RTOS" title="Nucleus RTOS">Nucleus RTOS</a>^</li>

<li><a href="NuttX" title="NuttX">NuttX</a>^°</li>

<li><a href="Operating_System_Embedded" class="mw-redirect" title="Operating System Embedded">Operating System Embedded</a>^ (OSE)</li>

<li><a href="RTEMS" title="RTEMS">RTEMS</a>°</li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="TRON_project" title="TRON project">TRON</a> support</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="ITRON_project" title="ITRON project">ITRON project</a></li>

<li><a href="T-Kernel" title="T-Kernel">T-Kernel</a>

<ul><li><a href="Micro_T-Kernel" title="Micro T-Kernel">Micro T-Kernel</a></li>

<li><a href="T-Engine_Forum" title="T-Engine Forum">T-Engine Forum</a> (organization)</li>

<li><a href="T-License" title="T-License">T-License</a></li></ul></li></ul>

<li><i><a href="RTEMS" title="RTEMS">RTEMS</a>°</i></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Capability-based_security" title="Capability-based security">Capability-based</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Java_virtual_machine" title="Java virtual machine">Java virtual machine</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><i><a href="JavaOS#Chorus/Jazz" title="JavaOS">Chorus/Jazz</a></i>^ (<i><a href="JavaOS" title="JavaOS">JavaOS</a></i> + <i><a href="ChorusOS" title="ChorusOS">ChorusOS</a></i>^)</li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="DOS" title="DOS">DOS</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><i><a href="Multiuser_DOS" title="Multiuser DOS">Multiuser DOS</a></i>

<ul><li><i><a href="Concurrent_DOS" class="mw-redirect" title="Concurrent DOS">Concurrent DOS</a></i></li>

<li><i><a href="FlexOS" title="FlexOS">FlexOS</a></i></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="L4_microkernel_family" title="L4 microkernel family">L4</a> kernel</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="L4Linux" title="L4Linux">L<sup>4</sup>Linux</a>^°</li>

<li><a href="PikeOS" title="PikeOS">PikeOS</a>^</li>

<li><a href="Wombat_(operating_system)" title="Wombat (operating system)">Wombat</a>^°</li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Psion_(company)" title="Psion (company)">Psion</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><i><a href="EKA2" title="EKA2">EKA2</a></i>^° kernel → <i><a href="Symbian" title="Symbian">Symbian</a> OS</i>^°</li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Microsoft" title="Microsoft">Microsoft</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="ThreadX" title="ThreadX">ThreadX</a>^</li>

<li><a href="Windows_Embedded_Compact" class="mw-redirect" title="Windows Embedded Compact">Windows Embedded Compact</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="IBM" title="IBM">IBM</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Transaction_Processing_Facility" title="Transaction Processing Facility">Transaction Processing Facility</a> (TPF)</li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Texas_Instruments" title="Texas Instruments">Texas Instruments</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="TI-RTOS#RTOS_kernel_overview" title="TI-RTOS">TI-RTOS Kernel</a>^°</li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Digital_Equipment_Corporation" title="Digital Equipment Corporation">DEC</a> <a href="PDP-11" title="PDP-11">PDP-11</a> & <a href="VAX" title="VAX">VAX</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><i><a href="VAXELN" title="VAXELN">VAXELN</a></i></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Low resource</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="ChibiOS/RT" title="ChibiOS/RT">ChibiOS/RT</a>^°</li>

<li><a href="Contiki" title="Contiki">Contiki</a>°</li>

<li><a href="ERIKA_Enterprise" title="ERIKA Enterprise">ERIKA Enterprise</a>°</li>

<li>FunkOS°</li>

<li><a href="Apache_Mynewt" title="Apache Mynewt">Mynewt</a>°</li>

<li><a href="OpenComRTOS" title="OpenComRTOS">OpenComRTOS</a>^</li>

<li><a href="RT-Thread" title="RT-Thread">RT-Thread</a>° Nano</li>

<li><a href="RTEMS" title="RTEMS">RTEMS</a>°</li>

<li><a href="ThreadX" title="ThreadX">ThreadX</a>^</li>

<li><a href="Zephyr_(operating_system)" title="Zephyr (operating system)">Zephyr</a>^°</li></ul>

</div></td></tr></tbody></table><div>

<ul><li><i><a href="BeRTOS" title="BeRTOS">BeRTOS</a></i>^°</li>

<li><i><a href="DioneOS" title="DioneOS">DioneOS</a></i></li>

<li><a href="Segger_Microcontroller_Systems" title="Segger Microcontroller Systems">embOS</a></li>

<li><a href="FreeRTOS" title="FreeRTOS">FreeRTOS</a>^°</li>

<li><a href="Green_Hills_Software#Real-time_operating_systems" title="Green Hills Software">µ-velOSity</a>^</li>

<li><a href="OS-9" title="OS-9">OS-9</a> (<a href="Microware" title="Microware">Microware</a>)</li>

<li><a href="Phantom_OS" title="Phantom OS">Phantom OS</a>^°</li>

<li><a href="RT-Thread" title="RT-Thread">RT-Thread</a>° Standard</li>

<li><a href="ScreenOS" title="ScreenOS">ScreenOS</a></li>

<li><i><a href="Sintran_III" title="Sintran III">Sintran III</a></i></li>

<li><i><a href="THEOS" title="THEOS">THEOS</a></i></li>

<li><i><a href="Thoth_(operating_system)" title="Thoth (operating system)">Thoth</a></i>^ → <i><a href="Harmony_(operating_system)" title="Harmony (operating system)">Harmony</a></i>^</li>

<li><a href="VxWorks" title="VxWorks">VxWorks</a></li>

<li><a href="EulerOS" title="EulerOS">UniProton</a></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Software_framework" title="Software framework">Frameworks</a>, <a href="Software_development_kit" title="Software development kit">kits</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Robot_Operating_System" title="Robot Operating System">Robot Operating System</a>° 2</li>

<li><a href="Xenomai" title="Xenomai">Xenomai</a>°</li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Programmer" title="Programmer">Developers</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Gordon_Bell_(QNX)" title="Gordon Bell (QNX)">Gordon Bell</a></li>

<li><a href="David_Cheriton" title="David Cheriton">David Cheriton</a></li>

<li><a href="Dave_Cutler" title="Dave Cutler">Dave Cutler</a></li>

<li><a href="Dan_Dodge" title="Dan Dodge">Dan Dodge</a></li>

<li><a href="Adam_Dunkels" title="Adam Dunkels">Adam Dunkels</a></li>

<li><a href="Ken_Sakamura" title="Ken Sakamura">Ken Sakamura</a></li></ul>

</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>

<ul><li><i>Italics</i> <b>= discontinued</b></li>

<li><b>^ = <a href="Microkernel" title="Microkernel">Microkernel</a></b></li>

<li><b>° = <a href="Open-source_software" title="Open-source software">Open-source software</a></b><br><span class="noviewer" typeof="mw:File"><span title="List-Class article"></span></span> <b><a href="Comparison_of_real-time_operating_systems" title="Comparison of real-time operating systems">Comparison</a></b> <span class="noviewer" typeof="mw:File"><span title="Category"></span></span> <b>Category</b></li></ul>

</div></td></tr></tbody></table></div>

<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Disk_operating_systems_(DOS)553" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Disk_operating_systems_(DOS)553" style="font-size:114%;margin:0 4em"><a href="Disk_operating_system" title="Disk operating system">Disk operating systems</a> (DOS)</div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div>

<li><a href="Timeline_of_DOS_operating_systems" title="Timeline of DOS operating systems">Timeline</a></li>

<li><a href="Comparison_of_DOS_operating_systems" title="Comparison of DOS operating systems">Comparison</a></li>

<li><a href="List_of_DOS_commands" title="List of DOS commands">Commands</a></li>

<li><a href="Index_of_DOS_games" title="Index of DOS games">Games</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">MS-DOS, IBM PC DOS,<br>compatible systems</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="MS-DOS_4.0_(multitasking)" title="MS-DOS 4.0 (multitasking)">Multitasking MS-DOS 4.0/4.1</a></li>

<li><a href="Novell_DOS" class="mw-redirect" title="Novell DOS">Novell DOS</a></li>

<li><a href="SISNE_plus" title="SISNE plus">SISNE plus</a></li>

<li><a href="FreeDOS" title="FreeDOS">FreeDOS</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other <a href="X86" title="X86">x86</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Concurrent_CP/M-86" class="mw-redirect" title="Concurrent CP/M-86">Concurrent CP/M-86</a></li>

<li><a href="Concurrent_DOS" class="mw-redirect" title="Concurrent DOS">Concurrent DOS</a></li>

<li><a href="Datapac_System_Manager" class="mw-redirect" title="Datapac System Manager">Datapac System Manager</a></li>

<li><a href="FlexOS" title="FlexOS">FlexOS</a></li>

<li><a href="Multiuser_DOS" title="Multiuser DOS">Multiuser DOS</a></li>

<li><a href="NetWare_PalmDOS" class="mw-redirect" title="NetWare PalmDOS">NetWare PalmDOS</a></li>

<li><a href="Novell_DOS" class="mw-redirect" title="Novell DOS">Novell DOS</a></li>

<li><a href="OpenDOS" class="mw-redirect" title="OpenDOS">OpenDOS</a></li>

<li><a href="Towns_OS" class="mw-redirect" title="Towns OS">Towns OS</a></li>

<li><a href="TurboDOS" title="TurboDOS">TurboDOS</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other platforms</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="AmigaDOS" title="AmigaDOS">AmigaDOS</a></li>

<li><a href="AMSDOS" title="AMSDOS">AMSDOS</a></li>

<li><a href="ANDOS" title="ANDOS">ANDOS</a></li>

<li><a href="Apple_DOS" title="Apple DOS">Apple DOS</a></li>

<li><a href="Apple_ProDOS" title="Apple ProDOS">Apple ProDOS</a></li>

<li><a href="Apple_SOS" title="Apple SOS">Apple SOS</a></li>

<li><a href="Atari_DOS" title="Atari DOS">Atari DOS</a></li>

<li><a href="Atari_TOS" title="Atari TOS">Atari TOS</a></li>

<li><a href="Commodore_DOS" title="Commodore DOS">Commodore DOS</a></li>

<li><a href="Concurrent_DOS_68K" class="mw-redirect" title="Concurrent DOS 68K">Concurrent DOS 68K</a></li>

<li><a href="Concurrent_DOS_V60" class="mw-redirect" title="Concurrent DOS V60">Concurrent DOS V60</a></li>

<li><a href="Cromemco_DOS" title="Cromemco DOS">Cromemco DOS</a></li>

<li><a href="DEC_BATCH-11/DOS-11" title="DEC BATCH-11/DOS-11">DEC BATCH-11/DOS-11</a></li>

<li><a href="GEMDOS" class="mw-redirect" title="GEMDOS">GEMDOS</a></li>

<li><a href="IDEDOS" title="IDEDOS">IDEDOS</a></li>

<li><a href="IMDOS" title="IMDOS">IMDOS</a></li>

<li>MicroDOS</li>

<li><a href="MyDOS" class="mw-redirect" title="MyDOS">MyDOS</a></li>

<li><a href="NewDos/80" title="NewDos/80">NewDos/80</a></li>

<li><a href="PTDOS" title="PTDOS">PTDOS</a></li>

<li><a href="RealDOS" class="mw-redirect" title="RealDOS">RealDOS</a></li>

<li><a href="Sinclair_QDOS" title="Sinclair QDOS">Sinclair QDOS</a></li>

<li><a href="SmartDOS" class="mw-redirect" title="SmartDOS">SmartDOS</a></li>

<li><a href="SpartaDOS" class="mw-redirect" title="SpartaDOS">SpartaDOS</a></li>

<li><a href="SpartaDOS_X" title="SpartaDOS X">SpartaDOS X</a></li>

<li><a href="Technical_Support_SuperDOS" class="mw-redirect" title="Technical Support SuperDOS">Technical Support SuperDOS</a></li>

<li><a href="TRSDOS" title="TRSDOS">TRSDOS</a></li>

<li><a href="TurboDOS" title="TurboDOS">TurboDOS</a></li>

</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>

<ul><li><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> Category</li>

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