DEC H-222A Ferrite Core Memory
The H-222A ferrite core memory unit with capacity of 16K x 18 bits is originally from PDP-11 computer made by DEC.
The size of the memory unit is 397 x 220 x 15 mm and consists from two boards. The first board (on top) is controll unit with Unibus interface.
The second board (bottom) contains the ferrite plane memory.
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A photo of solder side of the top board (controll unit).
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The top view of the bottom board. The ferrite plane is protected with a plane board.
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A solder side of the ferrite core plane. It is bottom side of the memory unit.
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The ferrite core plane. It is splitted into 36 blocks. Each block has 32 columns.
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A detail view to block's corner of the ferrite core plane. The wire has 0.08 mm diammeter and the black knots are repairs of the broken wires.
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A detail view to repairs of the broken wires.
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A detail view to ferrite cores. Each ferrite core is traversed with three wires. The wires have 0.08 mm in diammeter. The cores have approx. 0.22 mm diammeter.
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