Computer Science for IGCSE & O level - Boolean Logic (Section 6 - No. 27)
The output of a NOR gate is high (1) only when:
All inputs are low (0)
All inputs are high (1)
One input is high (1)
One input is low (0)
Paliwanag
A NOR gate only gives a high (1) output when all inputs are low (0).