English: Two inputs are connected to open-emitter buffers. If all inputs are low, the buffers will be in a low-impedance state, and the output will be pulled low by the pull-down resistor. But if any input is high, the output will be pulled high by the buffer for that input. This corresponds to wired OR in active-high logic, or to wired AND in active-low logic, and allows multiple inputs to share the same output wire.