.

projects/12/SysTest/Main.jack

@@ -0,0 +1,31 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/12/SysTest/Main.jack
+
+/** Test program for the OS Sys class. */
+class Main {
+
+    /** Tests the wait method of the Sys class. */
+    function void main() {
+        var char key;
+
+        do Output.printString("Wait test:");
+        do Output.println();
+        do Output.printString("Press any key. After 2 seconds, another message will be printed:");
+
+        while (key = 0) {
+	        let key = Keyboard.keyPressed();
+        }
+        while (~(key = 0)) {
+            let key = Keyboard.keyPressed();
+        }
+        
+        do Sys.wait(2000);
+
+        do Output.println();
+        do Output.printString("Time is up. Make sure that 2 seconds elapsed.");
+        
+        return;
+    }
+}

projects/12/SysTest/Main.vm

@@ -0,0 +1,281 @@
+function Main.main 1
+push constant 10
+call String.new 1
+push constant 87
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 105
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 58
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+call Output.println 0
+pop temp 0
+push constant 64
+call String.new 1
+push constant 80
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 121
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 107
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 121
+call String.appendChar 2
+push constant 46
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 65
+call String.appendChar 2
+push constant 102
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 50
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 111
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 44
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 111
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 104
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 109
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 103
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 119
+call String.appendChar 2
+push constant 105
+call String.appendChar 2
+push constant 108
+call String.appendChar 2
+push constant 108
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 98
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 105
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 58
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+label L0
+push local 0
+push constant 0
+eq
+not
+if-goto L1
+call Keyboard.keyPressed 0
+pop local 0
+goto L0
+label L1
+label L2
+push local 0
+push constant 0
+eq
+not
+not
+if-goto L3
+call Keyboard.keyPressed 0
+pop local 0
+goto L2
+label L3
+push constant 2000
+call Sys.wait 1
+pop temp 0
+call Output.println 0
+pop temp 0
+push constant 45
+call String.new 1
+push constant 84
+call String.appendChar 2
+push constant 105
+call String.appendChar 2
+push constant 109
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 105
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 117
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 46
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 77
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 107
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 117
+call String.appendChar 2
+push constant 114
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 104
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 116
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 50
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 99
+call String.appendChar 2
+push constant 111
+call String.appendChar 2
+push constant 110
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 32
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 108
+call String.appendChar 2
+push constant 97
+call String.appendChar 2
+push constant 112
+call String.appendChar 2
+push constant 115
+call String.appendChar 2
+push constant 101
+call String.appendChar 2
+push constant 100
+call String.appendChar 2
+push constant 46
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+push constant 0
+return

projects/12/SysTest/Sys.jack

@@ -0,0 +1,51 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/12/Sys.jack
+
+/**
+ * A library that supports various program execution services.
+ */
+class Sys {
+
+    /** Performs all the initializations required by the OS. */
+    function void init() {
+        do Math.init();
+        do Keyboard.init();
+        do Memory.init();
+        do Output.init();
+        do Screen.init();
+        do Main.main();
+        do Sys.halt();
+    }
+
+    /** Halts the program execution. */
+    function void halt() {
+        while(true){
+        }
+    }
+
+    /** Waits approximately duration milliseconds and returns.  */
+    function void wait(int duration) {
+        var int i;
+        while (duration > 0){
+            let i = 100;
+            while(i > 0){
+                let i = i -1;
+            }
+            let duration = duration - 1;
+        }
+        return;
+    }
+
+    /** Displays the given error code in the form "ERR<errorCode>",
+     *  and halts the program's execution. */
+    function void error(int errorCode) {
+        var String s;
+        let s = String.new(3);
+        do s.setInt(errorCode);
+        do Output.printString("ERR");
+        do Output.printString(s);
+        return;
+    }
+}

projects/12/SysTest/Sys.vm

@@ -0,0 +1,75 @@
+function Sys.init 0
+call Math.init 0
+pop temp 0
+call Keyboard.init 0
+pop temp 0
+call Memory.init 0
+pop temp 0
+call Output.init 0
+pop temp 0
+call Screen.init 0
+pop temp 0
+call Main.main 0
+pop temp 0
+call Sys.halt 0
+pop temp 0
+function Sys.halt 0
+label L0
+push constant 1
+neg
+not
+if-goto L1
+goto L0
+label L1
+function Sys.wait 1
+label L2
+push argument 0
+push constant 0
+gt
+not
+if-goto L3
+push constant 100
+pop local 0
+label L4
+push local 0
+push constant 0
+gt
+not
+if-goto L5
+push local 0
+push constant 1
+sub
+pop local 0
+goto L4
+label L5
+push argument 0
+push constant 1
+sub
+pop argument 0
+goto L2
+label L3
+push constant 0
+return
+function Sys.error 1
+push constant 3
+call String.new 1
+pop local 0
+push local 0
+push argument 0
+call String.setInt 2
+pop temp 0
+push constant 3
+call String.new 1
+push constant 69
+call String.appendChar 2
+push constant 82
+call String.appendChar 2
+push constant 82
+call String.appendChar 2
+call Output.printString 1
+pop temp 0
+push local 0
+call Output.printString 1
+pop temp 0
+push constant 0
+return