Editing Logic family (section)

==Diode–transistor logic (DTL)==
{{Main|Diode–transistor logic}}

Class of digital circuits in which the logic gating function (e.g., AND) is performed by a diode network and the amplifying function is performed by a transistor.

[[Diode logic]] was used with vacuum tubes in the earliest electronic computers in the 1940s including [[ENIAC]].  Diode–transistor logic (DTL) was used in the [[IBM 608]], which was the first all-transistorized computer.  Early transistorized computers were implemented using discrete transistors, resistors, diodes and capacitors.

The first diode–transistor logic family of integrated circuits was introduced by [[Signetics]] in 1962. DTL was also made by Fairchild and [[Westinghouse Electric (1886)|Westinghouse]]. A family of diode logic and diode–transistor logic integrated circuits was developed by [[Texas Instruments]] for the [[D-37C]] [[Minuteman (missile)#Minuteman-II (LGM-30F)|Minuteman II Guidance Computer]] in 1962, but these devices were not available to the public.

A variant of DTL called "high-threshold logic" incorporated [[Zener diode]]s to create a large offset between logic 1 and logic 0 voltage levels. These devices usually ran off a 15 volt power supply and were found in industrial control, where the high differential was intended to minimize the effect of noise.<ref>{{cite book |first=Jacob |last=Millman |title=Microelectronics Digital and Analog Circuits and Systems |publisher=McGraw-Hill  |date=1979 |isbn=0-07-042327-X}}
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