A machine's screen can now be used to display initialization (diagnostic) messages, up until the Computer component is ready to power/start the CPU, at which point control of the screen reverts to the Video component

modules/pcx86/lib/disk.js

@@ -531,8 +531,11 @@ class Disk extends Component {
                 }
             }
         }
+        var sProgress = "Loading " + sDiskURL + "...";
         return !!Web.getResource(sDiskURL, null, true, function loadDone(sURL, sResponse, nErrorCode) {
             disk.doneLoad(sURL, sResponse, nErrorCode);
+        }, function(nState) {
+            disk.println(sProgress, Component.TYPE.PROGRESS);
         });
     }