https://gunkies.org/index.php?action=history&feed=atom&title=REV11_DMA_Refresh%2FBootstrap%2FTerminator 2026-05-07T12:19:53Z Revision history for this page on the wiki MediaWiki 1.30.1 https://gunkies.org/w/index.php?title=REV11_DMA_Refresh/Bootstrap/Terminator&diff=30464&oldid=prev 2023-07-12T11:51:27Z

<p>+image</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 11:51, 12 July 2023</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</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;">[[Image:REV11.jpg|thumb|250px|right|REV11-A board]]</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;"></ins></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>The '''REV11 DMA Refresh/Bootstrap/Terminator''' is a [[QBUS]] card which contains several different functions:</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>The '''REV11 DMA Refresh/Bootstrap/Terminator''' is a [[QBUS]] card which contains several different functions:</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;"></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;"></td></tr> <!-- diff cache key mediawiki-wiki_:diff:version:1.11a:oldid:30271:newid:30464 --> </table>

Jnc https://gunkies.org/w/index.php?title=REV11_DMA_Refresh/Bootstrap/Terminator&diff=30271&oldid=prev 2023-07-04T03:30:38Z

<p>Reasonably complete</p> <p><b>New page</b></p><div>The '''REV11 DMA Refresh/Bootstrap/Terminator''' is a [[QBUS]] card which contains several different functions:<br /> <br /> * [[Dynamic RAM]] [[main memory]] [[memory refresh|refresh]]<br /> * [[Read-only memory|ROM]] memory for [[bootstrap]]ping<br /> * 120-ohm [[bus]] [[terminator]]s<br /> <br /> The 'refresh' capability is because the earliest QBUS DRAM main memory cards (such as the [[MSV11-B MOS memory|MSV11-B]]) did not have 'on board' refresh capability, but depended on external refresh, performed over the QBUS. That refresh could be performed either by the [[LSI-11]] [[Central Processing Unit|CPU]], or an external device, such as the REV11 (if so, a [[jumper]] on the LSI-11 would disable it from doing refresh).<br /> <br /> The REV11 comes in two forms: the REV11-A ('''M9400-YA''') contains all three functions listed above; the REV11-C ('''M9400-YC''') omits the 120-ohm terminators.<br /> <br /> The REV11 is a [[DEC card form factor‎|dual]] card. It is one of three different [[peripheral]]s which can be produced from the same [[printed circuit board|PCB]] ([[DEC part number]] 50-11903B), depending on exactly which components are inserted into the card. The others are the [[TEV11 Terminator]] and the [[M9400 expansion cable connector card]].<br /> <br /> ==External links==<br /> <br /> * [http://www.bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Interfaces_Handbook_1980.pdf microcomputer interfaces handbook] - the REV11 is covered on pp. 538-546 (pp. 546-554 of the PDF)<br /> * [http://bitsavers.org/pdf/dec/qbus/MP00706-ET-LSI-11_Dec81.pdf ET-LSI-11 Field Maintenance Print Set] (MP00706) - the REV11 is covered on pp. 241-246 of the PDF<br /> <br /> [[Category: QBUS]]<br /> [[Category: QBUS ROMs]]</div>

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