Clearly any circuitry that could reduce reliance on them was of great interest. The diode OR gate. Thingmaker [CC BY-SA 4.0], via Wikimedia Commons. To the rescue of those 1950s designers came the ...

You guessed it, diodes can also be used to build logic gates, but not all of them, only the AND and OR gates can be built using diodes only. However, by adding a transistor as an active element ...