Don’t be thrown by its simplicity though. [Andrew] quickly moves on to talk about switching transistors and how they are used to build gates like the OR NOR gate seen above.

The NOR gate outputs LOW if any input is HIGH. The output is HIGH only if all inputs are LOW. Circuit Diagram: Operation: The two transistors are connected in parallel, sharing a common collector ...

At the time, resistors were cheaper and transistors were still hard to make. This approach was used with the Apollo Guidance Computer, which was built using discrete 3-input RTL-based NOR gates.

Tunnel-junction transistor lasers (TJ-TLs) is a critical element to form a universal electro-optical NOR gate and an optical bistable latch which can be developed into a compact chip-level solution ...

Article Open access Published: 25 May 2017 Digital logic circuits in yeast with CRISPR-dCas9 NOR gates Miles W. Gander, Justin D. Vrana, William E. Voje, James M. Carothers & Eric Klavins Nature ...

Photolithographic techniques have been applied to fabrication of an NOR solid circuit containing four resistors and a transistor. The two dimensional circuit is layed out on diffused base germanium in ...