H9276 backplane

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The H9276 backplane is a 9-slot Q/CD backplane, which could hold quad-sized cards. It was a Q22 backplane (the only significant difference from predecessor H9273 backplane, which was Q18); it was the standard backplane in the BA11-S mounting box.

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.)

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