
Diode–transistor logic (DTL) is a class of digital circuits that is the direct ancestor of transistor–transistor logic. It is called so because the logic gating function (e.g., AND) is performed by a diode network and the amplifying function is performed by a transistor (in contrast with RTL and TTL). == Implementations == The DTL circuit show...
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http://en.wikipedia.org/wiki/Diode–transistor_logic

Logic gates implemented using particular configurations of diodes and bipolar junction transistors. For the majority of today's designers, diode-transistor logic is of historical interest only. See also: Diode.
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https://www.encyclo.co.uk/local/20687
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