In case you didn?t already have this info... http://pdp-11.nl/fieldguide.html This site has a doc ? Field guide to Q bus and unibus options? modules and it?s listed as a Q bus 3rd party option as follows... MSV11-R Q General Robotics 4Mb 22-bit memory, MSV11-p compatible Sent from my iPhone On May 6, 2020, at 13:31, Chris Zach via cctalk <cctalk at classiccmp.org> wrote: ?Never heard of it, but if you want me to try plugging it into my BA23 let me know. What's the worst that could happen :-) C On 5/6/2020 4:23 PM, Noel Chiappa via cctalk wrote: Hi, I'm looking for documentation on the MSV11-R; there's next to nothing online. (An -11/84 manual gives config, but that's all I cam find.) There is an 'MSV11-R User Guide' (EK-MSV1R-UG), but it's not online; I don't suppose anyone out there has one? I'm trying to confirm an online report that it's a PMI card; if so, I want to put a warning on the CHWiki page for it, to warn people not to plug it into a Q/Q backplane. (I have one, and did try it back when I first got it, but I don't recall if I knew it might be a PMI card at the time! I'm too lazy/low-energy to get my Q/CD machine running so I can plug it in and see if it still works. :-) Given the size of the card, and the amount of non-memory logic, compared to the MSV11-M and MSV11-Q, I would tend to suspect it is a PMI card, but it would be good to find some DEC docs to confirm it. Noel

The link doesn't work but this does. http://www.aceware.com.au/acms/images/Invent/GeneralRoboticsMSV_11R.jpg Maybe it's PMI memory without ECC? I count 18 bits across which seems like the MSV11-Q parity memory. Does it say PMI on the side? C

One is a DEC M7458 MSV11-R, the other is from a 3rd party "General Robotics Corp." according to the printing on the board, which apparently happens to share the same model name. On Wed, May 6, 2020, 3:57 PM Chris Zach via cctalk <cctalk at classiccmp.org> wrote: