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Bus Transceiver contains information about the RedPower mod.
Eloraam described Bus Tranceivers as 32 AND gates in 1. Placed between bundled cables, you can select the direction signals will be allowed to proceed. If either the red-cable or blue-cable side is considered the "bottom" or "front" side of the Bus Transceiver, a signal to the bottom allows signals in the bundled cable to go from left to right. A signal to the top will allow signals to go from right to left. Providing a signal on both top and bottom will make it hold signals in the bundle even when you turn off the signal, because the left and right sides feed each other. Small red lights on the gate indicate which signals within each bundled cable are currently active.