Last MSV11-P question: Using them as Q bus memories

Chris Zach cz at
Wed May 27 15:17:58 CDT 2020

Ok, so we banged the MSV11-P revision B/C memory issues into the ground 
(looks like the problem is burst mode DMA on Q Bus can cause random 
failures that corrupt disks) however does anyone know if the bug will 
affect the board if you use it as a normal Q bus memory board?

In other words, if you put the board *below* an 11/73 or 11/83 so it 
reports as a non-PMI memory will it still have the same problem? I'd 
like to run my system with a full 4mb of memory, using my normal parity 
2mb board and a 2mb MSV11-P board that was from an 11/83?

Inquiring minds want to know :-)


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