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

Jay Jaeger cube1 at
Tue Oct 20 22:03:11 CDT 2020

On 10/20/2020 9:05 PM, Chris Zach via cctalk wrote:
> 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....
> CZ

Or maybe a PDP-15?  18 bits plus parity.

I would guess that that would be much more likely.


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