Quote:
Originally Posted by Quoth
* A relay can easily implement Not, Or and And, the building blocks of all digital computers, though Nand (And with inverted output) and Nor (Or with inverted output) are the usual building blocks. Absolutely nothing more is needed. A memory cell can be interconnected gates to make a Flip-Flop, though now a stored charge is often used, a solid state version of magnetic core stores.
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Minor clarification - Nand *or* Nor is all that's needed. Either will do, you don't need both.