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Bebop to the Boolean Boogie, 3rd Edition by Clive Maxfield

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Appendix B. Positive Versus Negative Logic

Are You Positive About That?

The terms positive logic and negative logic refer to two conventions that dictate the relationship between logical values and the physical voltages used to represent them. Unfortunately, although the core concepts are relatively simple, fully comprehending all of the implications associated with these conventions requires an exercise in lateral thinking sufficient to make even a strong man break down and weep!

Before plunging into the fray, it is important to understand that logic 0 and logic 1 are always equivalent to FALSE and TRUE, respectively.[1] The reason these terms are used interchangeably is that digital functions can be considered to represent either logical ...

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