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The Core Memory Module from my dad’s homebuilt PDP-11/05

2012101 points13 comments History & Retro Computing details

This is basically the 1974 version of a DIMM. It measures 16″ by 11.5″ and holds 16 kilobytes. It’s technically 18 bits wide but only 16 were used in the PDP-11. The raised part in the middle is where the cores are actually stored. Each bit is a little ring with 3 wires running through the middle. By running current…