https://gunkies.org/index.php?action=history&feed=atom&title=DW11_UNIBUS-to-LSI-11_Bus_Converter 2026-06-05T03:35:18Z Revision history for this page on the wiki MediaWiki 1.30.1 https://gunkies.org/w/index.php?title=DW11_UNIBUS-to-LSI-11_Bus_Converter&diff=27569&oldid=prev 2022-08-31T00:50:09Z

<p>Reasonably complete, albeit stubby</p> <p><b>New page</b></p><div>The '''DW11 UNIBUS-to-LSI-11 Bus Converter''' is a sub-system which allows the connection of a [[UNIBUS]] to a [[QBUS]]. Normal master/slave cycles, [[Direct Memory Access|DMA]] cycles, and [[interrupt]]s can all pass through the DW11. It was a [[QBUS#Variable address size|Q18]] QBUS device, so all [[address]]es were passed across un-modified.<br /> <br /> It was used in configurations where the arbitrating [[Central Processing Unit|CPU]] was on the UNIBUS; it is not clear if it would function correctly with the arbitrating CPU on the QBUS side.<br /> <br /> Physically, it consisted of two different boards: a [[DEC card form factor|quad]] M8217 board, which plugged into a UNIBUS [[Small Peripheral Controller|SPC]] slot; and an M9403 dual card, which plugged into the first slot of a [[QBUS backplanes|QBUS backplane]]. The two are connected by a pair of 40-[[conductor]] [[flat cable]]s, which plugged into a pair of [[Berg connector|Berg header]]s on each card; the BC05L cable was specified for this.<br /> <br /> It was originally from [[Digital Equipment Corporation|DEC]]'s Computer Special Systems division.<br /> <br /> {{semi-stub}}<br /> <br /> ==Further reading==<br /> <br /> * ''DW11 UNIBUS to LSI-11 Bus Converter Installation Guide'' (EK-DW11A-IN) - not available online; available in fiche<br /> <br /> ==External links==<br /> <br /> * [http://www.bitsavers.org/pdf/dec/graphics/MP01102_VS11_Engineering_Drawings_Mar81.pdf VS11 Field Maintenance Print Set] - DW11 Engineering Drawings are on pp. 57-65 of the PDF<br /> <br /> [[Category: UNIBUS]]<br /> [[Category: QBUS]]</div>

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