H9273 backplane
From Computer History Wiki
(Redirected from H9273-A backplane)
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
