H9270 backplane

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The H9270 backplane is a 4-slot Q/Q QBUS backplane, the standard backplane in the BA11-M mounting box. It could hold quad-sized cards.

It was a Q18 backplane, but it is relatively easy to upgrade it to Q22. A later variant, the H9270-Q, has jumpers which allow it to be configured for Q22 operation.

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