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  2. Diode logic - Wikipedia

    en.wikipedia.org/wiki/Diode_logic

    The following diode logic gates work in both active-high or active-low logic, however the logical function they implement is different depending on what voltage level is considered active. Switching between active-high and active-low is commonly used to achieve a more efficient logic design.

  3. Diode–transistor logic - Wikipedia

    en.wikipedia.org/wiki/Diode–transistor_logic

    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 functions AND and OR are performed by diode logic , while logical inversion (NOT) and amplification (providing signal restoration) is performed by a transistor (in contrast with ...

  4. Logic family - Wikipedia

    en.wikipedia.org/wiki/Logic_family

    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.

  5. Logic gate - Wikipedia

    en.wikipedia.org/wiki/Logic_gate

    Diode logic: DL: Tunnel diode logic: TDL: Exactly the same as diode logic but can perform at a higher speed. [failed verification] Neon logic: NL: Uses neon bulbs or 3-element neon trigger tubes to perform logic. Core diode logic: CDL: Performed by semiconductor diodes and small ferrite toroidal cores for moderate speed and moderate power level ...

  6. High-threshold logic - Wikipedia

    en.wikipedia.org/wiki/High-threshold_logic

    High-threshold logic (HTL), also known as low-speed logic (LSL) or high-level logic (HLL), is a variant of diode–transistor logic used in environments where noise is very high. FZH251, four two-input HTL AND

  7. Wired logic connection - Wikipedia

    en.wikipedia.org/wiki/Wired_logic_connection

    A wired logic connection is a logic gate that implements boolean algebra (logic) using only passive components such as diodes and resistors. A wired logic connection can create an AND or an OR gate. Limitations include the inability to create a NOT gate, the lack of amplification to provide level restoration, and its constant ohmic heating for ...

  8. Prisoners of Profit - The Huffington Post

    projects.huffingtonpost.com/prisoners-of-profit?...

    In 2001, an 18-year-old committed to a Texas boot camp operated by one of Slattery’s previous companies, Correctional Services Corp., came down with pneumonia and pleaded to see a doctor as he struggled to breathe.

  9. Logic level - Wikipedia

    en.wikipedia.org/wiki/Logic_level

    A level shifter connects one digital circuit that uses one logic level to another digital circuit that uses another logic level. Often two level shifters are used, one at each system: A line driver converts from internal logic levels to standard interface line levels; a line receiver converts from interface levels to internal voltage levels.

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