The Data and Return Stacks will each consist of a 64-byte ferrite core array. 64 bytes requires a 6-bit pointer to address the stack contents. This 6-bit pointer must be decoded to select one of 8 columns and 8 rows in the core matrix.
Below is a closeup of some of the edge connectors I will be using throughout this project. They are 44-pin Multibus II connectors from Digikey:
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