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Mostly Japanese prefer negative logic so you can face negative logic in Japanese equipment only
A positive logic system will output true only when the input is true. A negative logic system will output true only when the input is false.
The NOT logic gate is an example of a negative logic system. That is, NOT( false ) will output true.
could be negative or positive
"negative logic" just means, that the level used by "positive logic" within that logic family for False, is instead used for "True" and vice versa.
negative logic means negative input values. so by checking the truth table, it becomes an OR gate