This is the G227E X-Y core driver board from the MM8-E 4kx12 core memory option. This board was used to decode the address from the omnibus and drive the correct X any Y lines in the core memory with a controlled current. The reading or writing of the core ( 58K) was done by the G104 sense inhibit board ( 80K) . This board has several green wires from an ECO (engineering change order) to the board (fixes a design error). Back view of board. Core information ( 82K)
Core information ( 82K)
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