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DescriptionS111FlipChipBack.jpg
English: S111 Flip Chip (trademark) module from a PDP-8 computer, solder side. This module is a triple 2-input nand gate made with discrete component diode-transistor logic (there is one hybrid integrated circuit on the board, but the board is etched and drilled for the 5 discrete components that could replace that module.) The text etched on the board says "DIODE GATE R111 / 6 67" (implying a board design from 1967).
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