https://gunkies.org/index.php?action=history&feed=atom&title=H9270_backplaneH9270 backplane - Revision history2026-05-04T11:48:20ZRevision history for this page on the wikiMediaWiki 1.30.1https://gunkies.org/w/index.php?title=H9270_backplane&diff=30321&oldid=prevJnc: Stubby; mostly here as a repository for ext links2023-07-08T06:03:14Z<p>Stubby; mostly here as a repository for ext links</p>
<p><b>New page</b></p><div>The '''H9270 backplane''' is a 4-slot [[QBUS#Backplanes|Q/Q]] [[QBUS]] [[backplane]], the standard backplane in the [[BA11-M mounting box]]. It could hold [[DEC card form factor|quad-sized]] cards.<br />
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It was a [[QBUS#Variable_address_size|Q18]] backplane, but it is relatively easy to [[upgrading QBUS backplanes|upgrade it to Q22]]. A later variant, the H9270-Q, has [[jumper]]s which allow it to be configured for Q22 operation.<br />
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{{semi-stub}}<br />
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==External links==<br />
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* [http://www.bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Interfaces_Handbook_1980.pdf microcomputer interfaces handbook] - the H9270 is covered on pp. 425-430 (pp. 433-438 of the PDF)<br />
* [http://www.bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Products_Handbook_1985.pdf Microcomputer Products Handbook] - the H9270-Q is covered in Chapter 59 (pp. 555-560 of the PDF)<br />
* [http://www.bitsavers.org/pdf/dec/pdp11/1103/EK-LSI11-TM-002.pdf LSI-11, PDP-11/03 user's manual] (EK-LSI11-TM-002) - the H9270 is covered in Section 11.7 (pp. 131-134 of the PDF)<br />
* [http://www.bitsavers.org/pdf/dec/pdp11/1103/1103_Schematics.pdf PDP-11/03 Engineering Drawings] - the H9270 is covered on pp. 147-153 of the PDF<br />
* [http://www.bitsavers.org/pdf/dec/qbus/EK-BA11N-UG-001_BA11-N_Mounting_Box_Users_Guide_Jan78.pdf BA11-N mounting box user's guide] (EK-BA11N-UG-001) - the H9270 is covered on pp. 10-11<br />
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[[Category: QBUS Backplanes]]</div>Jnc