The weird stuff I keep finding: 19 bit core memory?

Chris Zach cz at
Tue Oct 20 21:05:53 CDT 2020

Now I'm starting to look through boxes to see if I have another 11/24 
CPU. I seem to recall picking a second one up somewhere, I also want to 
see if I still have the driver board for the second Plessy core memory. 
Might be around, might have been pitched.

So far I did find a box of DZ11's. Not sure why I have a dozen of them, 
they might have been from the USPS haul in days of yore. Anyone need a 
couple of DZ11's?

The real weird one is a quad board H216. I thought it was a Unibus core 
memory board, but it's 8k*19 bits, which means it came from one place: 
An MA10 memory box. The only one I may have been exposed to was AI (the 
original KA10). So question:

Did AI use MA10 memory boxes?
Did any of that stuff survive?
Anyplace else it might have come from?

Weird stuff. Got a lot of it....


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