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data-event-name="pinnable-header.vector-toc.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">hide</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">(Top)</div> </a> </li> <li id="toc-History" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#History"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>History</span> </div> </a> <ul id="toc-History-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Architecture" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Architecture"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Architecture</span> </div> </a> <button aria-controls="toc-Architecture-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Architecture subsection</span> </button> <ul id="toc-Architecture-sublist" class="vector-toc-list"> <li id="toc-Signals" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Signals"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Signals</span> </div> </a> <ul id="toc-Signals-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Hardware" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Hardware"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Hardware</span> </div> </a> <button aria-controls="toc-Hardware-sublist" class="cdx-button cdx-button--weight-quiet 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class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Computer bus</div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:DECstation-5000-200-hdr-0a.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/50/DECstation-5000-200-hdr-0a.jpg/220px-DECstation-5000-200-hdr-0a.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/50/DECstation-5000-200-hdr-0a.jpg/330px-DECstation-5000-200-hdr-0a.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/50/DECstation-5000-200-hdr-0a.jpg/440px-DECstation-5000-200-hdr-0a.jpg 2x" data-file-width="2816" data-file-height="2112" /></a><figcaption>DECstation 5000/200 with top cover removed.</figcaption></figure> <p><b>TURBOchannel</b> is an open <a href="/wiki/Computer_bus" class="mw-redirect" title="Computer bus">computer bus</a> developed by <a href="/wiki/Digital_Equipment_Corporation" title="Digital Equipment Corporation">DEC</a> by during the late 1980s and early 1990s. Although it is open for any vendor to implement in their own systems, it was mostly used in Digital's own systems such as the <a href="/wiki/MIPS_architecture" title="MIPS architecture">MIPS</a>-based <a href="/wiki/DECstation" title="DECstation">DECstation</a> and <a href="/wiki/DECsystem" title="DECsystem">DECsystem</a> systems, in the <a href="/wiki/VAXstation#VAXstation_4000_Series" title="VAXstation">VAXstation 4000</a>, and in the <a href="/wiki/DEC_Alpha" title="DEC Alpha">Alpha</a>-based <a href="/wiki/DEC_3000_AXP" title="DEC 3000 AXP">DEC 3000 AXP</a>. Digital abandoned the use of TURBOchannel in favor of the <a href="/wiki/Extended_Industry_Standard_Architecture" title="Extended Industry Standard Architecture">EISA</a> and <a href="/wiki/Peripheral_Component_Interconnect" title="Peripheral Component Interconnect">PCI</a> buses in late 1994, with the introduction of their <a href="/wiki/AlphaStation" title="AlphaStation">AlphaStation</a> and <a href="/wiki/AlphaServer" title="AlphaServer">AlphaServer</a> systems. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=TURBOchannel&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>TURBOchannel was developed in the late 1980s by Digital and was continuously revised through the early 1990s by the TURBOchannel Industry Group, an industry group set up by Digital to develop promote the bus. TURBOchannel has been an open bus from the beginning, the specification was publicly available at an initial purchase cost for the reproduction of material for third-party implementation, as were the mechanical specifications, for both implementation in both systems and in options. TURBOchannel was selected by the failed ACE (<a href="/wiki/Advanced_Computing_Environment" title="Advanced Computing Environment">Advanced Computing Environment</a>) for use as the industry standard bus in ARC (<a href="/wiki/Advanced_RISC_Computing" class="mw-redirect" title="Advanced RISC Computing">Advanced RISC Computing</a>) compliant machines. Digital initially expected TURBOchannel to gain widespeard industry acceptance due to its status as an ARC standard, although ultimately Digital was the only major user of the TURBOchannel in their own <a href="/wiki/DEC_3000_AXP" title="DEC 3000 AXP">DEC 3000 AXP</a>, <a href="/wiki/DECstation" title="DECstation">DECstation 5000 Series</a>, <a href="/wiki/DECsystem" title="DECsystem">DECsystem</a> and <a href="/wiki/VAXstation#VAXstation_4000_Series" title="VAXstation">VAXstation 4000</a> systems. While no third parties implemented TURBOchannel in systems, they did implement numerous TURBOchannel option modules for Digital's systems. </p><p>Although the main developer and promoter of TURBOchannel was the TURBOchannel Industry Group, Digital's TRI/ADD Program, an initiative to provide technical and marketing support to third parties implementing peripherals based on open interfaces such as FutureBus+, SCSI, VME and TURBOchannel for Digital's systems, was also involved in promoting TURBOchannel implementation and sales.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The TRI/ADD Program was discontinued on 15 December 1992, except for in Japan.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>In the early 1990s, Digital expected the TURBOchannel bus to face serious competition from other buses from other vendors such as HP, Sun and IBM, and therefore it announced that it intended to update the existing TURBOchannel specification to permit it to transfer up to 200 MB/s, using similar hardware. This upgrade to the protocol was to be backwards compatible, but Digital later canceled the intended update and TURBOchannel itself towards the end of 1994 once it became clear that PCI had become dominant. </p> <div class="mw-heading mw-heading2"><h2 id="Architecture">Architecture</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=TURBOchannel&action=edit&section=2" title="Edit section: Architecture"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>TURBOchannel is a 32-bit address and data <a href="/wiki/Multiplexed" class="mw-redirect" title="Multiplexed">multiplexed</a> bus, clocked at frequencies between 12.5 and 25 MHz, with a maximum theoretical usable bandwidth of 90 MB/s. The bus differs from others at the time by having point to point control lines. The firmware contained within TURBOchannel cards is MIPS <a href="/wiki/Machine_code" title="Machine code">machine code</a>, a remnant of the bus' original use in MIPS-based systems. Because of this, later systems that use this bus such as the <a href="/wiki/DEC_Alpha" title="DEC Alpha">Alpha</a>-based <a href="/wiki/DEC_3000_AXP" title="DEC 3000 AXP">DEC 3000 AXP</a> use an <a href="/wiki/Emulator" title="Emulator">emulator</a> contained in its system firmware to properly initialize them. </p> <table class="wikitable" style="text-align:center"> <tbody><tr> <th width="100">Clock frequency </th> <th width="100">Maximum theoretical bandwidth </th> <th width="50">Sustained bandwidth (using DMA) </th> <th width="80">Sustained bandwidth (using PIO) </th></tr> <tr> <td><b>12.5 MHz</b> </td> <td>50 MB/s </td> <td>? </td> <td>? </td></tr> <tr> <td><b>22.5 MHz</b> </td> <td>90 MB/s </td> <td>? </td> <td>? </td></tr> <tr> <td><b>25.0 MHz</b> </td> <td>100 MB/s </td> <td>90 MB/s </td> <td>? </td></tr> </tbody></table> <p>The TURBOchannel is a synchronous, asymmetrical I/O channel.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> It is asymmetrical in the sense that option modules (Digital terminology for expansion card) can communicate with the system module (Digital terminology for motherboard) and not with other option modules. </p><p>A simple protocol is used to make TURBOchannel efficient. The TURBOchannel bus does not permit bus mastering, if a TURBOchannel connected device wishes to communicate with another, it must first transfer this information to the memory so the other device can read it. The TURBOchannel protocol specifies that each option has its own physical address space. This address space is used to address registers and memory on the option. The maximum amount specified is 16 GB, although each implementation can have an amount anywhere below this amount. Digital's own systems use anywhere from 4 MB (for early DECstation 5000s) to 128 MB in high-end DEC 3000 AXP models. </p><p>The TURBOchannel bus uses a 32-bit data and address multiplexed bus for transferring data and addresses. Every TURBOchannel option slot has its own set of seven point-to-point control lines and five lines for universal control and arbitration. The point-to-point control lines are connected directly to the TURBOchannel interface. The TURBOchannel interface was not defined in the TURBOchannel specification, although Digital introduced three possible schemes and an example ASIC. The three possible schemes were divided into a low-cost, a mid-range and high performance system implementations. The system can either time-multiplex multiple option slots in order to use a single memory port to share its bandwidth or dedicate a memory port to each option slot. </p> <div class="mw-heading mw-heading3"><h3 id="Signals">Signals</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=TURBOchannel&action=edit&section=3" title="Edit section: Signals"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable" style="text-align:center"> <tbody><tr> <th width="50">Signal<br />name </th> <th width="100">Signal<br />source </th> <th width="200">Description </th></tr> <tr> <td><b>ad[P, 31..0]</b> </td> <td>Bussed </td> <td>Address/data bus </td></tr> <tr> <td><b>sel</b> </td> <td>System </td> <td>I/O read/write select </td></tr> <tr> <td><b>write</b> </td> <td>System </td> <td>I/O read/write specifier </td></tr> <tr> <td><b>ack</b> </td> <td>System </td> <td>DMA read/write acknowledge </td></tr> <tr> <td><b>err</b> </td> <td>System </td> <td>DMA error </td></tr> <tr> <td><b>reset</b> </td> <td>System </td> <td>System reset </td></tr> <tr> <td><b>clk</b> </td> <td>System </td> <td>Channel clock </td></tr> <tr> <td><b>rdy</b> </td> <td>Option </td> <td>I/O read/write ready </td></tr> <tr> <td><b>conflict</b> </td> <td>Option </td> <td>I/O read/write conflict </td></tr> <tr> <td><b>rReq</b> </td> <td>Option </td> <td>DMA read request </td></tr> <tr> <td><b>wReq</b> </td> <td>Option </td> <td>DMA write request </td></tr> <tr> <td><b>int</b> </td> <td>Option </td> <td>I/O interrupt </td></tr> </tbody></table> <div class="mw-heading mw-heading2"><h2 id="Hardware">Hardware</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=TURBOchannel&action=edit&section=4" title="Edit section: Hardware"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>TURBOchannel option modules uses a 96-pin DIN connector (specifically <b>DIN 41612</b>) and option modules mounted inline with the system module. Each option module can be a single-, double-, or triple-width. Although double and triple width options use more than one TURBOchannel connector, this does not mean that bandwidth is doubled or tripled, as the slots are still sharing a single bus. Double- and triple-width option modules are used to mechanically accommodate larger option modules and for supplying more power. The mechanical specification for option modules is also flexible. There are few limitations for attaching daughterboards such SIMM modules (used in graphics options) and components can be mounted on both sides of the option module, with components on the bottom being restricted only in height to ensure that the option module could fit in the system module while maintaining enough airflow for cooling. An airflow of 150 LFMs is required above the option module and an airflow of 50 LFMs is required below the option module. Each slot has 44 signal pins, of which 32 are used for data and addressing. </p> <table class="wikitable" style="text-align:center"> <tbody><tr> <th width="100">Form-factor </th> <th width="100">Width (mm) </th> <th width="100">Height (mm) </th> <th width="100">Depth (mm) </th> <th width="100">Area (mm<sup>2</sup> </th></tr> <tr> <td><b>Single-width</b> </td> <td>116.84 </td> <td> </td> <td>144.15 </td> <td>168 </td></tr> <tr> <td><b>Double-width</b> </td> <td> </td> <td> </td> <td> </td> <td> </td></tr> <tr> <td><b>Triple-width</b> </td> <td> </td> <td> </td> <td> </td> <td> </td></tr> </tbody></table> <div class="mw-heading mw-heading3"><h3 id="Electrical">Electrical</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=TURBOchannel&action=edit&section=5" title="Edit section: Electrical"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The TURBOchannel slot supplies +5 and +12V power rails and provides a maximum of 26 watts of power. The following table shows how many amperes are supplied by each power rail. </p> <table class="wikitable" style="text-align:center"> <tbody><tr> <th width="100">Width of option module </th> <th width="100">At +5V </th> <th width="100">At +12V </th></tr> <tr> <td>Single-width </td> <td>4.0A </td> <td>0.5A </td></tr> <tr> <td>Double-width </td> <td>8.0A </td> <td>1.0A </td></tr> <tr> <td>Triple-width </td> <td>12.0A </td> <td>1.5A </td></tr> </tbody></table> <div class="mw-heading mw-heading3"><h3 id="TURBOchannel_Extender">TURBOchannel Extender</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=TURBOchannel&action=edit&section=6" title="Edit section: TURBOchannel Extender"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The TURBOchannel bus can be "extended" by the TURBOchannel Extender (TcE) box. Because some options such as 3D graphics accelerators may require more power and board space than a single slot can provide, they are often double- or triple-width option modules. As such option modules consume additional space and slots inside a system, their presence may limit the number or even prevent the installation of other TURBOchannel option modules. A TURBOchannel Extender box is used to reduce the number of slots required inside a system for double and triple width options. </p><p>The TURBOchannel Extender box contains a PCB with two or three TURBOchannel slots and a power supply for supplying the required power to the slots. A TURBOchannel option module installed in the host and accompanying external cable extend the necessary data, addressing and control lines to the TURBOchannel extender box. There is no performance loss associated with the use of a TcE box, however TcE boxes support only one option module, regardless of how many slots are used in the extender box. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=TURBOchannel&action=edit&section=7" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/List_of_device_bandwidths" class="mw-redirect" title="List of device bandwidths">List of device bandwidths</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=TURBOchannel&action=edit&section=8" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">TRI/ADD Program Shippable Products Catalog, September 1991, Revision 5.0, Digital Equipment Corporation.</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text">TRI/ADD Program Shippable Products Catalog, Revision 21.0, January 1993, Digital Equipment Corporation.</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text">TURBOchannel Hardware Specification, On-line version, EK-369AA-OD-007B, January 1993, Digital Equipment Corporation</span> </li> </ol></div></div> <ul><li>TURBOchannel Hardware Specification, EK-369AA-OD-007B, January 1993, Digital Equipment Corporation.</li></ul> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=TURBOchannel&action=edit&section=9" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="ftp://ftp.hp.com/ftp1/pub/alphaserver/archive/triadd">A collection of archived documents from the defunct TURBOchannel Industry Group. Contains the entire TURBOchannel specification.</a><sup class="noprint Inline-Template"><span style="white-space: nowrap;">[<i><a href="/wiki/Wikipedia:Link_rot" title="Wikipedia:Link rot"><span title=" Dead link tagged November 2024">permanent dead link</span></a></i><span style="visibility:hidden; color:transparent; padding-left:2px">‍</span>]</span></sup></li> <li><a rel="nofollow" class="external text" href="http://www.tobycreek.org/computers/alpha.html">Shows interior of a computer using the TURBOchannel bus</a></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl 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style="width:1%">Standards</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="/wiki/SS-50_bus" title="SS-50 bus">SS-50 bus</a></li> <li><a href="/wiki/S-100_bus" title="S-100 bus">S-100 bus</a></li> <li><a href="/wiki/Multibus" title="Multibus">Multibus</a></li> <li><a href="/wiki/Unibus" title="Unibus">Unibus</a></li> <li><a href="/wiki/VAXBI_bus" title="VAXBI bus">VAXBI</a></li> <li><a href="/wiki/MBus_(SPARC)" title="MBus (SPARC)">MBus</a></li> <li><a href="/wiki/STD_Bus" title="STD Bus">STD Bus</a></li> <li><a href="/wiki/System_Management_Bus" title="System Management Bus">SMBus</a></li> <li><a href="/wiki/Q-Bus" title="Q-Bus">Q-Bus</a></li> <li><a href="/wiki/Europe_Card_Bus" title="Europe Card Bus">Europe Card Bus</a></li> <li><a href="/wiki/Industry_Standard_Architecture" title="Industry Standard Architecture">ISA</a></li> <li><a href="/wiki/STEbus" title="STEbus">STEbus</a></li> <li><a href="/wiki/Amiga_Zorro_II" title="Amiga Zorro II">Zorro II</a></li> <li><a href="/wiki/Amiga_Zorro_III" title="Amiga Zorro III">Zorro III</a></li> <li><a href="/wiki/Computer_Automated_Measurement_and_Control" title="Computer Automated Measurement and Control">CAMAC</a></li> <li><a href="/wiki/FASTBUS" title="FASTBUS">FASTBUS</a></li> <li><a href="/wiki/Low_Pin_Count" title="Low Pin Count">LPC</a></li> <li><a href="/wiki/HP_Precision_Bus" title="HP Precision Bus">HP Precision Bus</a></li> <li><a href="/wiki/Extended_Industry_Standard_Architecture" title="Extended Industry Standard Architecture">EISA</a></li> <li><a href="/wiki/VMEbus" title="VMEbus">VME</a></li> <li><a href="/wiki/VME_eXtensions_for_Instrumentation" title="VME eXtensions for Instrumentation">VXI</a></li> <li><a href="/wiki/VXS" title="VXS">VXS</a></li> <li><a href="/wiki/VPX" title="VPX">VPX</a></li> <li><a href="/wiki/NuBus" title="NuBus">NuBus</a></li> <li><a class="mw-selflink selflink">TURBOchannel</a></li> <li><a href="/wiki/Micro_Channel_architecture" title="Micro Channel architecture">MCA</a></li> <li><a href="/wiki/SBus" title="SBus">SBus</a></li> <li><a href="/wiki/VESA_Local_Bus" title="VESA Local Bus">VLB</a></li> <li><a href="/wiki/GSC_bus" title="GSC bus">HP GSC bus</a></li> <li><a href="/wiki/InfiniBand" title="InfiniBand">InfiniBand</a></li> <li><a href="/wiki/Ethernet" title="Ethernet">Ethernet</a></li> <li><a href="/wiki/Ultra_Port_Architecture" title="Ultra Port Architecture">UPA</a></li> <li><a href="/wiki/Peripheral_Component_Interconnect" title="Peripheral Component Interconnect">PCI</a></li> <li><a href="/wiki/PCI-X" title="PCI-X">PCI Extended (PCI-X)</a></li> <li><a href="/wiki/PCI_eXtensions_for_Instrumentation" title="PCI eXtensions for Instrumentation">PXI</a></li> <li><a href="/wiki/PCI_Express" title="PCI Express">PCI Express (PCIe)</a></li> <li><a href="/wiki/Accelerated_Graphics_Port" title="Accelerated Graphics Port">AGP</a></li> <li><a href="/wiki/Compute_Express_Link" title="Compute Express Link">Compute Express Link (CXL)</a></li> <li><a href="/wiki/Direct_Media_Interface" title="Direct Media Interface">Direct Media Interface (DMI)</a></li> <li><a href="/wiki/RapidIO" title="RapidIO">RapidIO</a></li> <li><a href="/wiki/Intel_QuickPath_Interconnect" title="Intel QuickPath Interconnect">Intel QuickPath Interconnect</a></li> <li><a href="/wiki/NVLink" title="NVLink">NVLink</a></li> <li><a href="/wiki/HyperTransport" title="HyperTransport">HyperTransport</a> <ul><li><a href="/wiki/Infinity_Fabric" class="mw-redirect" title="Infinity Fabric">Infinity Fabric</a></li></ul></li> <li><a href="/wiki/Intel_Ultra_Path_Interconnect" title="Intel Ultra Path Interconnect">Intel Ultra Path Interconnect</a></li> <li><a href="/wiki/Coherent_Accelerator_Processor_Interface" title="Coherent Accelerator Processor Interface">Coherent Accelerator Processor Interface (CAPI)</a></li> <li><a href="/wiki/SpaceWire" title="SpaceWire">SpaceWire</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Storage</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="/wiki/ST-506/ST-412" title="ST-506/ST-412">ST-506</a></li> <li><a href="/wiki/Enhanced_Small_Disk_Interface" title="Enhanced Small Disk Interface">ESDI</a></li> <li><a href="/wiki/Intelligent_Peripheral_Interface" title="Intelligent Peripheral Interface">IPI</a></li> <li><a href="/wiki/Storage_Module_Device" title="Storage Module Device">SMD</a></li> <li><a href="/wiki/Parallel_ATA" title="Parallel ATA">Parallel ATA (PATA)</a></li> <li><a href="/wiki/Bus_and_Tag" title="Bus and Tag">Bus and Tag</a></li> <li><a href="/wiki/Digital_Storage_Systems_Interconnect" title="Digital Storage Systems Interconnect">DSSI</a></li> <li><a href="/wiki/HIPPI" title="HIPPI">HIPPI</a></li> <li><a href="/wiki/SATA" title="SATA">Serial ATA (SATA)</a></li> <li><a href="/wiki/SCSI" title="SCSI">SCSI</a> <ul><li><a href="/wiki/Parallel_SCSI" title="Parallel SCSI">Parallel</a></li> <li><a href="/wiki/Serial_Attached_SCSI" title="Serial Attached SCSI">SAS</a></li></ul></li> <li><a href="/wiki/ESCON" title="ESCON">ESCON</a></li> <li><a href="/wiki/Fibre_Channel" title="Fibre Channel">Fibre Channel</a></li> <li><a href="/wiki/Serial_Storage_Architecture" title="Serial Storage Architecture">SSA</a></li> <li><a href="/wiki/SATA_Express" title="SATA Express">SATAe</a></li> <li>PCI Express (via <a href="/wiki/Advanced_Host_Controller_Interface" title="Advanced Host Controller Interface">AHCI</a> or <a href="/wiki/NVM_Express" title="NVM Express">NVMe</a> logical device interface)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Peripheral</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="/wiki/Apple_Desktop_Bus" title="Apple Desktop Bus">Apple Desktop Bus</a></li> <li><a href="/wiki/Atari_SIO" title="Atari SIO">Atari SIO</a></li> <li><a href="/wiki/Digital_Control_Bus" title="Digital Control Bus">DCB</a></li> <li><a href="/wiki/Commodore_bus" title="Commodore bus">Commodore bus</a></li> <li><a href="/wiki/HP-IL" title="HP-IL">HP-IL</a></li> <li><a href="/wiki/HIL_bus" title="HIL bus">HIL</a></li> <li><a href="/wiki/MIDI" title="MIDI">MIDI</a></li> <li><a href="/wiki/RS-232" title="RS-232">RS-232</a></li> <li><a href="/wiki/RS-422" title="RS-422">RS-422</a></li> <li><a href="/wiki/RS-423" title="RS-423">RS-423</a></li> <li><a href="/wiki/RS-485" title="RS-485">RS-485</a></li> <li><a href="/wiki/Lightning_(connector)" title="Lightning (connector)">Lightning</a></li> <li><a href="/wiki/DMX512#DMX512-A" title="DMX512">DMX512-A</a></li> <li><a href="/wiki/IEEE-488" class="mw-redirect" title="IEEE-488">IEEE-488 (GPIB)</a></li> <li><a href="/wiki/IEEE_1284" title="IEEE 1284">IEEE-1284 (parallel port)</a></li> <li><a href="/wiki/IEEE_1394" title="IEEE 1394">IEEE-1394 (FireWire)</a></li> <li><a href="/wiki/UNI/O" title="UNI/O">UNI/O</a></li> <li><a href="/wiki/1-Wire" title="1-Wire">1-Wire</a></li> <li><a href="/wiki/I%C2%B2C" title="I²C">I²C</a> (<a href="/wiki/ACCESS.bus" title="ACCESS.bus">ACCESS.bus</a>, <a href="/wiki/Power_Management_Bus" title="Power Management Bus">PMBus</a>, <a href="/wiki/System_Management_Bus" title="System Management Bus">SMBus</a>)</li> <li><a href="/wiki/I3C_(bus)" title="I3C (bus)">I3C</a></li> <li><a href="/wiki/Serial_Peripheral_Interface" title="Serial Peripheral Interface">SPI</a></li> <li><a href="/wiki/IEC_61030" title="IEC 61030">D²B</a></li> <li><a href="/wiki/Parallel_SCSI" title="Parallel SCSI">Parallel SCSI</a></li> <li><a href="/wiki/Profibus" title="Profibus">Profibus</a></li> <li><a href="/wiki/USB" title="USB">USB</a></li> <li><a href="/wiki/Camera_Link" title="Camera Link">Camera Link</a></li> <li><a href="/wiki/PCI_Express#PCI_Express_External_Cabling" title="PCI Express">External PCIe</a></li> <li><a href="/wiki/Thunderbolt_(interface)" title="Thunderbolt (interface)">Thunderbolt</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Audio</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="/wiki/ADAT_Lightpipe" title="ADAT Lightpipe">ADAT Lightpipe</a></li> <li><a href="/wiki/AES3" title="AES3">AES3</a></li> <li><a href="/wiki/Intel_High_Definition_Audio" title="Intel High Definition Audio">Intel HD Audio</a></li> <li><a href="/wiki/I%C2%B2S" title="I²S">I²S</a></li> <li><a href="/wiki/MADI" title="MADI">MADI</a></li> <li><a href="/wiki/McASP" title="McASP">McASP</a></li> <li><a href="/wiki/S/PDIF" title="S/PDIF">S/PDIF</a></li> <li><a href="/wiki/TOSLINK" title="TOSLINK">TOSLINK</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Portable</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="/wiki/PC_Card" title="PC Card">PC Card</a></li> <li><a href="/wiki/ExpressCard" title="ExpressCard">ExpressCard</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Embedded</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="/wiki/Multidrop_bus" title="Multidrop bus">Multidrop bus</a></li> <li><a href="/wiki/CoreConnect" title="CoreConnect">CoreConnect</a></li> <li><a href="/wiki/Advanced_Microcontroller_Bus_Architecture" title="Advanced Microcontroller Bus Architecture">AMBA</a> (<a href="/wiki/Advanced_eXtensible_Interface" title="Advanced eXtensible Interface">AXI</a>)</li> <li><a href="/wiki/Wishbone_(computer_bus)" title="Wishbone (computer bus)">Wishbone</a></li> <li><a href="/wiki/SLIMbus" title="SLIMbus">SLIMbus</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div><small>Interfaces are listed by their speed in the (roughly) ascending order, so the interface at the end of each section should be the fastest.</small><br /><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Computer_buses" title="Category:Computer buses">Category</a></div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Digital_Equipment_Corporation" 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="3"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Digital_Equipment_Corporation" title="Template:Digital Equipment Corporation"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Digital_Equipment_Corporation" title="Template talk:Digital Equipment Corporation"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Digital_Equipment_Corporation" title="Special:EditPage/Template:Digital Equipment Corporation"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Digital_Equipment_Corporation" style="font-size:114%;margin:0 4em"><a href="/wiki/Digital_Equipment_Corporation" title="Digital Equipment Corporation">Digital Equipment Corporation</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Key people</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ken_Olsen" title="Ken Olsen">Ken Olsen</a> (founder and CEO, 1957–1992)</li> <li><a href="/wiki/Harlan_Anderson" title="Harlan Anderson">Harlan Anderson</a> (co-founder)</li> <li><a href="/wiki/Gordon_Bell" title="Gordon Bell">Gordon Bell</a> (VP of engineering)</li> <li><a href="/wiki/Robert_Palmer_(computer_businessman)" title="Robert Palmer (computer businessman)">Robert Palmer</a> (CEO, 1992–1998)</li></ul> </div></td><td class="noviewer navbox-image" rowspan="9" style="width:1px;padding:0 0 0 2px"><div><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:Digital_Equipment_Corporation_1993_logo.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/90/Digital_Equipment_Corporation_1993_logo.svg/110px-Digital_Equipment_Corporation_1993_logo.svg.png" decoding="async" width="110" height="33" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/90/Digital_Equipment_Corporation_1993_logo.svg/165px-Digital_Equipment_Corporation_1993_logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/90/Digital_Equipment_Corporation_1993_logo.svg/220px-Digital_Equipment_Corporation_1993_logo.svg.png 2x" data-file-width="3124" data-file-height="938" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Instruction_set_architecture" title="Instruction set architecture">Instruction set<br />architectures</a>,<br /><a href="/wiki/Processor_(computing)" title="Processor (computing)">processors</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="/wiki/PDP-11_architecture" title="PDP-11 architecture">PDP-11</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>LSI-11</li> <li>F-11</li> <li><a href="/wiki/DEC_T-11" title="DEC T-11">T-11</a></li> <li><a href="/wiki/DEC_J-11" title="DEC J-11">J-11</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/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"> <ul><li><a href="/wiki/DEC_V-11" title="DEC V-11">V-11</a></li> <li><a href="/wiki/MicroVAX_78032" title="MicroVAX 78032">MicroVAX 78032</a></li> <li><a href="/wiki/CVAX" title="CVAX">CVAX</a> <ul><li><a href="/wiki/CVAX#SOC" title="CVAX">SOC</a></li></ul></li> <li><a href="/wiki/Rigel_(microprocessor)" title="Rigel (microprocessor)">Rigel</a> <ul><li><a href="/wiki/Rigel_(microprocessor)#Mariah" title="Rigel (microprocessor)">Mariah</a></li></ul></li> <li><a href="/wiki/NVAX" title="NVAX">NVAX</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/DEC_Alpha" title="DEC Alpha">Alpha</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="/wiki/Alpha_21064" title="Alpha 21064">Alpha 21064</a> <ul><li><a href="/wiki/Alpha_21064#Alpha_21066" title="Alpha 21064">21066</a></li> <li><a href="/wiki/Alpha_21064#Alpha_21068" title="Alpha 21064">21068</a></li></ul></li> <li><a href="/wiki/Alpha_21164" title="Alpha 21164">Alpha 21164</a> (<a href="/wiki/Alpha_21164#Alpha_21164PC_(PCA56)" title="Alpha 21164">21164PC</a>)</li> <li><a href="/wiki/Alpha_21264" title="Alpha 21264">Alpha 21264</a></li> <li><a href="/wiki/Alpha_21364" title="Alpha 21364">Alpha 21364</a></li> <li><a href="/wiki/Alpha_21464" title="Alpha 21464">Alpha 21464</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/DEC_PRISM" title="DEC PRISM">MicroPRISM</a></li> <li><a href="/wiki/StrongARM" title="StrongARM">StrongARM</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Computer_terminal" title="Computer terminal">Computer<br />terminals</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="/wiki/VT05" title="VT05">VT05</a> (1970)</li> <li><a href="/wiki/DEC_GT40" title="DEC GT40">GT40</a> (1972)</li> <li><a href="/wiki/VT52" title="VT52">VT50/VT52</a> (1975)</li> <li><a href="/wiki/VT55" class="mw-redirect" title="VT55">VT55</a></li> <li><a href="/wiki/VT62" class="mw-redirect" title="VT62">VT62</a></li> <li><a href="/wiki/VT100" title="VT100">VT100</a> (1978)</li> <li><a href="/wiki/VT101" class="mw-redirect" title="VT101">VT101</a></li> <li><a href="/wiki/VT102" class="mw-redirect" title="VT102">VT102</a></li> <li><a href="/wiki/VT103" class="mw-redirect" title="VT103">VT103</a></li> <li><a href="/wiki/VT105" class="mw-redirect" title="VT105">VT105</a></li> <li><a href="/wiki/VT131" class="mw-redirect" title="VT131">VT131</a></li> <li><a href="/wiki/VT180" title="VT180">VT180</a></li> <li><a href="/wiki/VT220" title="VT220">VT220</a> (1983)</li> <li><a href="/wiki/VT240" class="mw-redirect" title="VT240">VT240</a></li> <li><a href="/wiki/VT241" class="mw-redirect" title="VT241">VT241</a></li> <li><a href="/wiki/VT320" title="VT320">VT320</a> (1987)</li> <li><a href="/wiki/VT330" class="mw-redirect" title="VT330">VT330</a></li> <li><a href="/wiki/VT340" class="mw-redirect" title="VT340">VT340</a></li> <li><a href="/wiki/VT420" title="VT420">VT420</a> (1990)</li> <li><a href="/wiki/VT1000" title="VT1000">VT1000</a> (1990)</li> <li><a href="/wiki/VT510" class="mw-redirect" title="VT510">VT510</a> (1993)</li> <li><a href="/wiki/VT520" title="VT520">VT520</a> (1994)</li> <li><a href="/wiki/VT525" class="mw-redirect" title="VT525">VT525</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Operating_system" title="Operating system">Operating<br />systems</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><a href="/wiki/PDP-7#Software" title="PDP-7">DECsys</a></li> <li><a href="/wiki/4K_Disk_Monitor_System" class="mw-redirect" title="4K Disk Monitor System">4K DMS</a></li> <li><a href="/wiki/Commercial_Operating_System" title="Commercial Operating System">COS</a></li> <li><a href="/wiki/TOPS-10" title="TOPS-10">TOPS-10</a></li> <li><a href="/wiki/RSX-15" class="mw-redirect" title="RSX-15">RSX-15</a></li> <li><a href="/wiki/TSS/8" title="TSS/8">TSS/8</a></li> <li><a href="/wiki/OS/8" title="OS/8">OS/8</a></li> <li><a href="/wiki/DEC_BATCH-11/DOS-11" title="DEC BATCH-11/DOS-11">DOS-11</a></li> <li><a href="/wiki/RT-11" title="RT-11">RT-11</a></li> <li><a href="/wiki/RSTS/E" title="RSTS/E">RSTS/E</a></li> <li><a href="/wiki/RSX-11" title="RSX-11">RSX-11</a> <ul><li><a href="/wiki/Interactive_Application_System" title="Interactive Application System">IAS</a></li></ul></li> <li><a href="/wiki/MUMPS#1970s" title="MUMPS">DSM-11</a></li> <li><a href="/wiki/TOPS-20" title="TOPS-20">TOPS-20</a></li> <li><a href="/wiki/OpenVMS" title="OpenVMS">VAX/VMS</a></li> <li><a href="/wiki/VAXELN" title="VAXELN">VAXELN</a></li> <li><a href="/wiki/Ultrix" title="Ultrix">Ultrix</a></li> <li><a href="/wiki/DEC_MICA" title="DEC MICA">MICA</a></li> <li><a href="/wiki/Digital_UNIX" class="mw-redirect" title="Digital UNIX">Digital UNIX</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Programming_language" title="Programming language">Programming<br />languages</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="/wiki/BASIC-8" title="BASIC-8">BASIC-8</a></li> <li><a href="/wiki/DIBOL" title="DIBOL">DIBOL</a></li> <li><a href="/wiki/FOCAL_(programming_language)" title="FOCAL (programming language)">FOCAL</a></li> <li><a href="/wiki/MACRO-10" title="MACRO-10">MACRO-10</a></li> <li><a href="/wiki/MACRO-11" title="MACRO-11">MACRO-11</a></li> <li><a href="/wiki/MUMPS" title="MUMPS">MUMPS</a></li> <li><a href="/wiki/VAX_MACRO" title="VAX MACRO">VAX MACRO</a></li> <li><a href="/wiki/DIGITAL_Command_Language" title="DIGITAL Command Language">DIGITAL Command Language</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Character_encoding" title="Character encoding">Character sets</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><a href="/wiki/Multinational_Character_Set" title="Multinational Character Set">Code page 1100</a> (Multinational)</li> <li><a href="/wiki/Code_page_1287" title="Code page 1287">Code page 1287</a> (Greek)</li> <li><a href="/wiki/Code_page_1288" title="Code page 1288">Code page 1288</a> (Turkish)</li> <li><a href="/wiki/DEC_Hebrew" title="DEC Hebrew">Hebrew</a></li> <li><a href="/wiki/National_Replacement_Character_Set" title="National Replacement Character Set">National Replacement</a></li> <li><a href="/wiki/DEC_RADIX_50" title="DEC RADIX 50">RADIX 50</a></li> <li><a href="/wiki/DEC_Special_Graphics" title="DEC Special Graphics">Special Graphics</a></li> <li><a href="/wiki/DEC_Technical_Character_Set" title="DEC Technical Character Set">Technical</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Bus_(computing)" title="Bus (computing)">Bus standards</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="/wiki/Digital_Storage_Systems_Interconnect" title="Digital Storage Systems Interconnect">Digital Storage Systems Interconnect</a></li> <li><a href="/wiki/Massbus" title="Massbus">Massbus</a></li> <li><a href="/wiki/Q-Bus" title="Q-Bus">Q-Bus</a></li> <li><a href="/wiki/Standard_Disk_Interconnect" title="Standard Disk Interconnect">Standard Disk Interconnect</a></li> <li><a href="/wiki/Synchronous_Backplane_Interconnect" title="Synchronous Backplane Interconnect">Synchronous Backplane Interconnect</a></li> <li><a class="mw-selflink selflink">TURBOchannel</a></li> <li><a href="/wiki/Unibus" title="Unibus">Unibus</a></li> <li><a href="/wiki/VAXBI_bus" title="VAXBI bus">VAXBI bus</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other <a href="/wiki/Computer_hardware" title="Computer hardware">hardware</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><a href="/wiki/DECtalk" title="DECtalk">DECtalk</a></li> <li><a href="/wiki/DECtape" title="DECtape">DECtape</a></li> <li><a href="/wiki/DECwriter" title="DECwriter">DECwriter</a></li> <li><a href="/wiki/Digital_Linear_Tape" title="Digital Linear Tape">Digital Linear Tape</a></li> <li><a href="/wiki/Dynamically_Redefined_Character_Set" title="Dynamically Redefined Character Set">Dynamically Redefined Character Set</a></li> <li><a href="/wiki/Firefly_(cache_coherence_protocol)" title="Firefly (cache coherence protocol)">Firefly</a></li> <li><a href="/wiki/Flip-Chip_module" title="Flip-Chip module">Flip-Chip module</a></li> <li><a href="/wiki/Gold_key_(DEC)" title="Gold key (DEC)">Gold key</a></li> <li><a href="/wiki/LK201" title="LK201">LK201</a></li> <li><a href="/wiki/LK421" title="LK421">LK421</a></li> <li><a href="/wiki/Mass_Storage_Control_Protocol" title="Mass Storage Control Protocol">Mass Storage Control Protocol</a></li> <li><a href="/wiki/PALcode" title="PALcode">PALcode</a></li> <li><a href="/wiki/RA90" title="RA90">RA90</a></li> <li><a href="/wiki/RK05" title="RK05">RK05</a></li> <li><a href="/wiki/RL02" title="RL02">RL02</a></li> <li><a href="/wiki/Star_coupler" title="Star coupler">Star coupler</a></li> <li><a href="/wiki/System_Module" title="System Module">System Module</a></li> <li><a href="/wiki/TU81" title="TU81">TU81</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related topics</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="/wiki/AdvFS" title="AdvFS">AdvFS</a></li> <li><a href="/wiki/AltaVista" title="AltaVista">AltaVista</a></li> <li><a href="/wiki/Compaq" title="Compaq">Compaq</a></li> <li><i><a href="/wiki/CPU_Wars" title="CPU Wars">CPU Wars</a></i></li> <li><a href="/wiki/DECnet" title="DECnet">DECnet</a></li> <li><a href="/wiki/DECUS" title="DECUS">DECUS</a> <ul><li><a href="/wiki/HP-Interex" title="HP-Interex">HP-Interex</a></li></ul></li> <li><a href="/wiki/Digital_Federal_Credit_Union" title="Digital Federal Credit Union">Digital Federal Credit Union</a></li> <li><a href="/wiki/Dynamic_debugging_technique" title="Dynamic debugging 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