Cleaned up DMA port handling and minor tweaks

modules/pcjs/lib/computer.js

@@ -876,6 +876,10 @@ Computer.prototype.powerOff = function(fSave, fShutdown)
 Computer.prototype.reset = function()
 {
     if (this.bus && this.bus.reset) {
+        /*
+         * TODO: Why does WebStorm think that this.bus.type is undefined? The base class (Component)
+         * constructor defines it.
+         */
         this.printMessage("Resetting " + this.bus.type);
         this.bus.reset();
     }