H9273 backplane: Difference between revisions
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==External links== | ==External links== | ||
* [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 H9273 is covered on pp. 10-13 | * [http://www.bitsavers.org/pdf/dec/qbus/BA11-N/EK-BA11N-UG-001_BA11-N_Mounting_Box_Users_Guide_Jan78.pdf BA11-N mounting box user's guide] (EK-BA11N-UG-001) - the H9273 is covered on pp. 10-13 | ||
* [http://www.bitsavers.org/pdf/dec/qbus/MP00740_1123_schem_Oct81.pdf PDP11/23 Field Maintenance Print Set] (MP00740) - The H9273 is covered in the BA11-N Field Maintenance Print Set (MP00487) on pp. 41-51 | * [http://www.bitsavers.org/pdf/dec/qbus/MP00740_1123_schem_Oct81.pdf PDP11/23 Field Maintenance Print Set] (MP00740) - The H9273 is covered in the BA11-N Field Maintenance Print Set (MP00487) on pp. 41-51 | ||
[[Category: QBUS Backplanes]] | [[Category: QBUS Backplanes]] | ||
Latest revision as of 16:21, 9 October 2026
The H9273 backplane is a 9-slot Q/CD QBUS backplane, the standard backplane in the BA11-N mounting box. It could hold quad-sized cards.
It was a Q18 backplane, but it is relatively easy to upgrade it to Q22.
Since it was a Q/CD backplane, dual-width QBUS cards could only be placed in the left-hand slots, and quad QBUS-only cards had to not use any pins on the right-hand C/D connectors. (The only DEC card with a problem with this seems to have been the MMV11-A.)
External links
- BA11-N mounting box user's guide (EK-BA11N-UG-001) - the H9273 is covered on pp. 10-13
- PDP11/23 Field Maintenance Print Set (MP00740) - The H9273 is covered in the BA11-N Field Maintenance Print Set (MP00487) on pp. 41-51
