but very few optical transistors or logic devices possess them 3. In addition to basic complete logic functionality such as NOR or NAND gates, the first four requirements below are essential for ...

It’s a surprise then to find that a working CPU can be made with just a single NOR gate — which is what is at the heart of [Dennis Kuschel]’s My4th single board discrete logic computer.

[Andrew] quickly moves on to talk about switching transistors and how they are used to build gates like the OR NOR gate seen above. If this is the least bit interesting you should also look back ...