L2DTL | Article about L2DTL by The Free Dictionary
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DTL(Diode-Transistor Logic) A type of digital circuit design that followed resistor-transistor logic (RTL) and was superseded by transistor-transistor logic (TTL). DTL used resistors at the inputs, diodes for logic gates and bipolar transistors for amplification. In subsequent TTL, the diodes were replaced with transistors. See RTL and TTL.