Memory

There is one last piece of the puzzle that we have not talked about yet. Memory. How does a computer remember things?

Every gate we've looked at forgets the moment its input changes. It only knows right now.

But take a gate's output and feed it back into its own input and something changes. The circuit holds its state. The state stays locked in place. It remembers the last thing that happened, even after the input is gone.

That loop is called a latch. It's the simplest memory a computer has.

Gates that decide. Gates that remember. That's the whole foundation.