https://gunkies.org/index.php?action=history&feed=atom&title=Standard_Drive_Bus 2026-05-15T07:40:45Z Revision history for this page on the wiki MediaWiki 1.30.1 https://gunkies.org/w/index.php?title=Standard_Drive_Bus&diff=34195&oldid=prev 2024-04-19T10:59:35Z

<p>+Categories</p> <table class="diff diff-contentalign-left" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr style="vertical-align: top;" lang="en"> <td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 10:59, 19 April 2024</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l17" >Line 17:</td> <td colspan="2" class="diff-lineno">Line 17:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>--&gt;</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>--&gt;</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category: DEC Mass Storage]]</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category: DEC Mass Storage]]</div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category: SDI]]</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category: STI]]</ins></div></td></tr> <!-- diff cache key mediawiki-wiki_:diff:version:1.11a:oldid:28707:newid:34195 --> </table>

Jnc https://gunkies.org/w/index.php?title=Standard_Drive_Bus&diff=28707&oldid=prev 2023-02-25T05:01:44Z

<p>Move to separate page</p> <p><b>New page</b></p><div>The '''Standard Drive Bus''' (sometimes referred to by the acronym, '''SDB''') is the lowest, [[hardware]] level of several [[Digital Equipment Corporation|DEC]] designed [[mass storage]] [[drive]] to [[device controller|controller]] interfaces. It is a key element of the [[Digital Storage Architecture]] (DSA), used with [[PDP-11]]s and with [[VAX]] single and multiple [[Central Processing Unit|CPU]] systems.<br /> <br /> A new standard, it was introduced (in 1981) because no existing standard had the capabilities that DEC deemed necessary in the mass storage arena. It is part of the [[Standard Disk Interconnect]] and [[Standard Tape Interconnect]]; both add higher layer [[protocol]]s which are adapted to the needs of their supported device types.<br /> <br /> The SDB drive to controller interconnect is a [[serial]] link which connects each drive directly (i.e. individually), or 'radially' (a term for such a device connection approach which DEC also used in its early machines), to its controller. <br /> <br /> Electrically, the SDB consists of four signal carriers, using small-diameter [[coaxial cable]]s; two for moving user data, commands, and responses between drive and controller, and two for continuous real time transmission of drive and controller status information. The SDB signals are [[transformer]] coupled (economically feasible with such a small number of links), so the drive and controller do not require a common [[direct current|DC]] [[ground]], simplifying installation. Transformer coupling also eliminates unpredictable and unrepeatable &quot;[[ground loop]]&quot; problems, and provides for installation flexibility, since SDB drives can be physically added to or removed from a subsystem without disrupting its operation.<br /> <br /> These four cables are emplaced in a single [[connector]] for actual installation of SDB units.<br /> <br /> ==Further reading==<br /> <br /> * ''Digital Storage Technology Handbook'', 1989 (EC-H0374-45/89) - Chapter 4, The Digital Storage Interconnects<br /> * ''Digital Large System Mass Storage Handbook'', 1986 - Chapter 7, The Storage Interconnect<br /> &lt;!-- <br /> ==External links==<br /> --&gt;<br /> [[Category: DEC Mass Storage]]</div>

Jnc