Memory Stack Circuit Module

P/N 51385 D6 74389
S/N H-03-018670
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DGC Nova
16k Memory Stack
107-000184-01
Copyright © 1972 by
Data General Corp
(all rights reserved)

This "mattress" of core memory is from an early 1970s Data General Nova computer. This was some of the highest density core but it was not long before integrated circut technology replaced it as the storage medium of choice. Core stores did have the advantage of having a high resistance to radiation so the medium was retained for many years in a military environment.
The Date code on the board is handwritten as part of the Serial No. and it was probably made in Mexico. 32 integrated circuits surround the memory board, which flips open. On the 15 inch by 15 inch plug-in circuit board consisting of 70 integrating circuits, 16 transistors, and a myriad of discrete components (carbon and wire wound resistors, mica, disc, and tantalum capacitors, variable trimpots, semiconductor diodes, etc.) This plug-in circuit board consists of two 50 gold plated edge connectors (double sided).
It is not known why this item was found at Rochester nor what it was used for.
https://en.wikipedia.org/wiki/Data_General_Nova
http://www.digibarn.com/collections/parts/dg-corememory/index.html