Dokument erweitert

tools/builtInChips/Keyboard.hdl

@@ -1,23 +1,17 @@
 // This file is part of www.nand2tetris.org
 // and the book "The Elements of Computing Systems"
 // by Nisan and Schocken, MIT Press.
-// File name: tools/builtIn/Keyboard.hdl
-
+// File name: tools/builtInChips/Keyboard.hdl
 /**
  * The keyboard (memory map).
- * Outputs the code of the currently pressed key.
+ * Outputs the character code of the currently pressed key,
+ * or 0 if no key is pressed.
  *
- * The built-in chip implementation has two side effects supplied 
- * by the simulator. First, the keyboard memory map is continuously 
- * being refreshed from the physical keyboard unit. Second, it 
- * displays a keyboard icon and data entry GUI.
+ * This built-in implementation has a visualization side effect.
  */
-
 CHIP Keyboard {
 
-    OUT out[16];   // The ASCII code of the pressed key, 
-                   // or 0 if no key is currently pressed, 
-                   // or one the special codes listed in Figure 5.5.
+    OUT out[16];
 
     BUILTIN Keyboard;
 }