H9270 backplane
From Computer History Wiki
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.
External links
- microcomputer interfaces handbook - the H9270 is covered on pp. 425-430 (pp. 433-438 of the PDF)
- Microcomputer Products Handbook - the H9270-Q is covered in Chapter 59 (pp. 555-560 of the 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)
- PDP-11/03 Engineering Drawings - the H9270 is covered on pp. 147-153 of the PDF
- BA11-N mounting box user's guide (EK-BA11N-UG-001) - the H9270 is covered on pp. 10-11
