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Clearpoint QED1 4MB Qbus PMI Memory

Terri Kennedy said:
I'd say go ahead and ask Ron at VARx. He's been very supportive of the hobbyist community.

Note that he moved some years ago and has downsized his inventory a bit, but he still has quite a few rarities.
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We have also had good experiences dealing with VARx, both in professional and hobbyist capacities.
 
I reached out to Ron at VARx, but he does not have that documentation. Bummer. This really shouldn't be so difficult to find.
 
Just to wrap this up, I was definitely experiencing cache failure on my KDJ11-B: I found the dead cache chip and replaced it. Just finished 10 passes of `VMJAB0` on the Clearpoint QED1 with no errors or weird stoppages, green light on the whole time!
 
sorry, real life had me, this works as 4mb pmi in an 11/83
 

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My board went to yellow again on Friday (at VCF West), then early this afternoon started failing POST (though LED still shows yellow). Switching the jumper to 2MB got it back to green - apparently the new failure(s) happened in the 2MB it doesn't use when it's configured for 2MB - and made it through the rest of VCF West, but I have some work to do when I get home...
 
I'm late to this, but I just got around to first, testing all the ram chips (all good, one was misinserted), and then trying my QED1 in an 11/73. Plugged into the second slot, after the CPU. No LEDS lit on the QED1 and the boot diags report no memory. Anyone else have one of these act this way?
 
Did you pull all the PMI jumpers? What architecture is the 11/73 backplane? Q22 / Q22, Q22 / CD, other? I had a misinserted DRAM as well, plus two questionable chips.
 
shirsch said:
Did you pull all the PMI jumpers? What architecture is the 11/73 backplane? Q22 / Q22, Q22 / CD, other? I had a misinserted DRAM as well, plus two questionable chips.
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Yep, no PMI jummpers (it came without any, so I didn't have to remove them). It's a BA23, so first three slots are Q22/CD and the rest are serpentine Q22.
 
Just for laughs it may be worth inserting all the jumpers on the left side and plugging it in above the CPU. Maybe it will work as PMI memory.
 
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