Diode-transistor logic
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Diode-transistor logic (DTL) is a class of digital circuits built from bipolar junction transistors (BJT), diodes and resistors; it is the direct ancestor of transistor-transistor logic.

See also: resistor-transistor logic (RTL), transistor-transistor logic (DTL), emitter coupled logic (ECL).

The original article can be found at: http://en.wikipedia.org/wiki/Diode-transistor_logic.
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