Addressing Circuit The image above shows a thumbnail of the interactive Java applet embedded into this page. Unfortunately, your browser is not Java-aware or Java is disabled in the browser preferences. To check if java is disabled (and you are using IE) goto TOOLS | Internet Options | Advanced (tab) | Scroll down the list and look for Java it should appear as shown: If Java is not listed. You will need instal it. After the installation is complete you might have to restart the browser. A Register gives us the ability to store an 8bit number and is the basis of computer memory. Only when the clock is triggered (in this case Rising Edge) does the input get stored.