ID some core memory

[steven at malikoff.com]

Bill said
> Just curious...can anyone id the system that used these two types of core
> memory?  I am thinking the first is a hand-made custom core, but the 2nd is
> definitely from a commercial system.  Looks kind of IBM-ish but it's
> nothing I can ID.  It's not an IBM 1401 I don't think.
> http://vintagecomputer.net/core-memory/
> Thanks
> Bill

It's not a 1401 core plane. Here are a couple of pictures of what (I am pretty sure) is a 1401 core plane that I have from my dad:
    http://web.aanet.com.au/~malikoff/ibm/IBM_1401_core_memory_plane_1.jpg
Close-up. Has a sharp molded corner and the grooves for the wires:
    http://web.aanet.com.au/~malikoff/ibm/IBM_1401_core_memory_plane_2.jpg

Refer to PDF page 12 of http://www.bitsavers.org/pdf/ibm/1401/A24-1403-5_1401_Reference_Apr62.pdf
for another photo of this.

Steve.