Minecraft wiki entry for Memory, associated text: Such an "RS NAND latch" is equivalent to an RS NOR, but with inverters applied to all the inputs and outputs. The RS NAND is logically equivalent to the RS NOR, as the same R and S inputs give the same Q output. However, these designs take inverse R and S (R̅, S̅) as inputs. When S̅ and R̅ are both off, Q and Q̅ are on. When S̅ is on, but R̅ is off, Q̅ will be on. When R̅ is on, but S̅ is off, Q will be on. When S̅ and R̅ are both on, it does not change Q and Q̅. They will be the same as they were before S̅ and R̅ were both turned on.