[O] Refactor

CreateMarsJar.bat

@@ -1 +0,0 @@
-jar cmf mainclass.txt Mars.jar PseudoOps.txt Config.properties Syscall.properties Settings.properties MARSlicense.txt mainclass.txt MipsXRayOpcode.xml registerDatapath.xml controlDatapath.xml ALUcontrolDatapath.xml CreateMarsJar.bat CreateMarsJar.sh Mars.java Mars.class docs help images mars 

CreateMarsJar.sh

@@ -1,2 +0,0 @@
-# If you can't generate due of permissions, do a "chmod +x CreateMarsJar.sh".
-jar cmf mainclass.txt Mars.jar PseudoOps.txt Config.properties Syscall.properties Settings.properties MARSlicense.txt mainclass.txt MipsXRayOpcode.xml registerDatapath.xml controlDatapath.xml ALUcontrolDatapath.xml CreateMarsJar.bat CreateMarsJar.sh Mars.java Mars.class docs help images mars 

build.gradle

@@ -1,12 +1,3 @@
-/*
- * This file was generated by the Gradle 'init' task.
- *
- * This generated file contains a sample Java application project to get you started.
- * For more details take a look at the 'Building Java & JVM projects' chapter in the Gradle
- * User Manual available at https://docs.gradle.org/7.5.1/userguide/building_java_projects.html
- * This project uses @Incubating APIs which are subject to change.
- */
-
 plugins {
     // Apply the application plugin to add support for building a CLI application in Java.
     id 'application'
@@ -34,5 +25,5 @@ testing {
 
 application {
     // Define the main class for the application.
-    mainClass = 'mars.assembler.App'
+    mainClass = 'Mars'
 }

convert_encoding.py

@@ -0,0 +1,17 @@
+import os
+from pathlib import Path
+from subprocess import check_output
+
+if __name__ == '__main__':
+    java = Path('src/main/java')
+    files = [Path(root) / f for root, dir, files in os.walk(java) for f in files]
+
+    for f in files:
+        ftype = check_output(f'file {f}', shell=True).decode()
+        if '8859' not in ftype:
+            continue
+
+        print(f'Converting {f} to UTF-8...')
+        f.write_text(f.read_text('ISO-8859-1'), 'utf8')
+
+    # print(files)

settings.gradle

@@ -1,11 +1 @@
-/*
- * This file was generated by the Gradle 'init' task.
- *
- * The settings file is used to specify which projects to include in your build.
- *
- * Detailed information about configuring a multi-project build in Gradle can be found
- * in the user manual at https://docs.gradle.org/7.5.1/userguide/multi_project_builds.html
- * This project uses @Incubating APIs which are subject to change.
- */
-
-rootProject.name = 'MARS-Assembler'
+rootProject.name = 'MARS'

src/main/java/Mars.java

@@ -1,4 +1,3 @@
-
 /*
 Copyright (c) 2003-2006,  Pete Sanderson and Kenneth Vollmar
 
@@ -29,14 +28,14 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 /**
  * Portal to Mars
- * 
+ *
  * @author Pete Sanderson
  * @version March 2006
  **/
 
-    public class Mars {
-       public static void main(String[] args) {
-         new mars.MarsLaunch(args);
-      }
-   } 
+public class Mars {
+    public static void main(String[] args) {
+        new mars.MarsLaunch(args);
+    }
+}
 

src/main/java/mainclass.txt

@@ -1,2 +0,0 @@
-Main-Class: Mars
-Class-Path: .

src/main/java/mars/Globals.java

@@ -1,12 +1,16 @@
-   package mars;
-   import mars.mips.instructions.syscalls.*;
-   import mars.mips.instructions.*;
-   import mars.mips.hardware.*;
-   import mars.assembler.*;
-   import mars.venus.*;
-   import mars.util.*;
-   import java.io.*;
-   import java.util.*;
+package mars;
+
+import mars.assembler.SymbolTable;
+import mars.mips.hardware.Memory;
+import mars.mips.instructions.InstructionSet;
+import mars.mips.instructions.syscalls.SyscallNumberOverride;
+import mars.util.PropertiesFile;
+import mars.venus.VenusUI;
+
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.Properties;
+import java.util.StringTokenizer;
 	
 /*
 Copyright (c) 2003-2008,  Pete Sanderson and Kenneth Vollmar
@@ -38,212 +42,254 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 /**
  * Collection of globally-available data structures.
- * 
- * @author Pete Sanderson 
+ *
+ * @author Pete Sanderson
  * @version August 2003
  */
-    public class Globals
-   {
-      // List these first because they are referenced by methods called at initialization.
-      private static String configPropertiesFile = "Config";
-      private static String syscallPropertiesFile = "Syscall";
-   	
-    /** The set of implemented MIPS instructions. **/
-      public static InstructionSet instructionSet;
-   /** the program currently being worked with.  Used by GUI only, not command line. **/
-      public static MIPSprogram program;
-   /** Symbol table for file currently being assembled. **/
-      public static SymbolTable symbolTable;
-    /** Simulated MIPS memory component. **/
-      public static Memory memory;
-    /** Lock variable used at head of synchronized block to guard MIPS memory and registers **/
-      public static Object memoryAndRegistersLock = new Object();
-    /** Flag to determine whether or not to produce internal debugging information. **/
-      public static boolean debug = false;
-    /** Object that contains various settings that can be accessed modified internally. **/
-      static Settings settings;
-    /** String to GUI's RunI/O text area when echoing user input from pop-up dialog. */
-      public static String userInputAlert = "**** user input : ";
-    /** Path to folder that contains images */	
+public class Globals {
+    /**
+     * Path to folder that contains images
+     */
     // The leading "/" in filepath prevents package name from being pre-pended.
-      public static final String imagesPath = "/images/";
-   	/** Path to folder that contains help text */	
-      public static final String helpPath = "/help/";
-    /* Flag that indicates whether or not instructionSet has been initialized. */
-      private static boolean initialized = false;
+    public static final String imagesPath = "/images/";
+    /**
+     * Path to folder that contains help text
+     */
+    public static final String helpPath = "/help/";
+    /**
+     * The current MARS version number. Can't wait for "initialize()" call to get it.
+     */
+    public static final String version = "4.5";
+    /**
+     * MARS copyright years
+     */
+    public static final String copyrightYears = getCopyrightYears();
+    /**
+     * MARS copyright holders
+     */
+    public static final String copyrightHolders = getCopyrightHolders();
+    /**
+     * The set of implemented MIPS instructions.
+     **/
+    public static InstructionSet instructionSet;
+    /**
+     * the program currently being worked with.  Used by GUI only, not command line.
+     **/
+    public static MIPSprogram program;
+    /**
+     * Symbol table for file currently being assembled.
+     **/
+    public static SymbolTable symbolTable;
+    /**
+     * Simulated MIPS memory component.
+     **/
+    public static Memory memory;
+    /**
+     * Lock variable used at head of synchronized block to guard MIPS memory and registers
+     **/
+    public static Object memoryAndRegistersLock = new Object();
+    /**
+     * Flag to determine whether or not to produce internal debugging information.
+     **/
+    public static boolean debug = false;
+    /**
+     * String to GUI's RunI/O text area when echoing user input from pop-up dialog.
+     */
+    public static String userInputAlert = "**** user input : ";
+    /**
+     * MARS exit code -- useful with SYSCALL 17 when running from command line (not GUI)
+     */
+    public static int exitCode = 0;
+    public static boolean runSpeedPanelExists = false;
+    /**
+     * Object that contains various settings that can be accessed modified internally.
+     **/
+    static Settings settings;
     /* The GUI being used (if any) with this simulator. */
-      static VenusUI gui = null;
-    /** The current MARS version number. Can't wait for "initialize()" call to get it. */
-      public static final String version = "4.5";
-    /** List of accepted file extensions for MIPS assembly source files. */
-      public static final ArrayList fileExtensions = getFileExtensions();
-    /** Maximum length of scrolled message window (MARS Messages and Run I/O) */
-      public static final int maximumMessageCharacters = getMessageLimit();
-    /** Maximum number of assembler errors produced by one assemble operation */
-      public static final int maximumErrorMessages = getErrorLimit();
-    /** Maximum number of back-step operations to buffer */
-      public static final int maximumBacksteps = getBackstepLimit();
-   	/** MARS copyright years */
-      public static final String copyrightYears = getCopyrightYears();
-   	/** MARS copyright holders */
-      public static final String copyrightHolders = getCopyrightHolders(); 
-		/** Placeholder for non-printable ASCII codes */
-		public static final String ASCII_NON_PRINT = getAsciiNonPrint();
-		/** Array of strings to display for ASCII codes in ASCII display of data segment. ASCII code 0-255 is array index. */
-		public static final String[] ASCII_TABLE = getAsciiStrings();
-      /** MARS exit code -- useful with SYSCALL 17 when running from command line (not GUI) */
-      public static int exitCode = 0;
-   	
-      public static boolean runSpeedPanelExists = false;
-   	
-       private static String getCopyrightYears() {
-         return "2003-2014";
-      }
-       private static String getCopyrightHolders() {
-         return "Pete Sanderson and Kenneth Vollmar";
-      }
-    
-       public static void setGui(VenusUI g) {
-         gui = g;
-      }
-       public static VenusUI getGui() {
-         return gui;
-      }
-    
-       public static Settings getSettings() {
-         return settings;
-      }
-   
+    static VenusUI gui = null;
+    // List these first because they are referenced by methods called at initialization.
+    private static final String configPropertiesFile = "Config";
+    /**
+     * List of accepted file extensions for MIPS assembly source files.
+     */
+    public static final ArrayList fileExtensions = getFileExtensions();
+    /**
+     * Maximum length of scrolled message window (MARS Messages and Run I/O)
+     */
+    public static final int maximumMessageCharacters = getMessageLimit();
+    /**
+     * Maximum number of assembler errors produced by one assemble operation
+     */
+    public static final int maximumErrorMessages = getErrorLimit();
+    /**
+     * Maximum number of back-step operations to buffer
+     */
+    public static final int maximumBacksteps = getBackstepLimit();
+    /**
+     * Placeholder for non-printable ASCII codes
+     */
+    public static final String ASCII_NON_PRINT = getAsciiNonPrint();
+    /**
+     * Array of strings to display for ASCII codes in ASCII display of data segment. ASCII code 0-255 is array index.
+     */
+    public static final String[] ASCII_TABLE = getAsciiStrings();
+    private static final String syscallPropertiesFile = "Syscall";
+    /* Flag that indicates whether or not instructionSet has been initialized. */
+    private static boolean initialized = false;
+
+    private static String getCopyrightYears() {
+        return "2003-2014";
+    }
+
+    private static String getCopyrightHolders() {
+        return "Pete Sanderson and Kenneth Vollmar";
+    }
+
+    public static VenusUI getGui() {
+        return gui;
+    }
+
+    public static void setGui(VenusUI g) {
+        gui = g;
+    }
+
+    public static Settings getSettings() {
+        return settings;
+    }
+
     /**
      * Method called once upon system initialization to create the global data structures.
      **/
-     
-       public static void initialize(boolean gui) {
-         if (!initialized) {
+
+    public static void initialize(boolean gui) {
+        if (!initialized) {
             memory = Memory.getInstance();  //clients can use Memory.getInstance instead of Globals.memory
             instructionSet = new InstructionSet();
-            instructionSet.populate();    
+            instructionSet.populate();
             symbolTable = new SymbolTable("global");
             settings = new Settings(gui);
             initialized = true;
-            debug = false; 
-				memory.clear(); // will establish memory configuration from setting
-         }
-      }
-   	
-   	// Read byte limit of Run I/O or MARS Messages text to buffer.
-       private static int getMessageLimit() {
-         return getIntegerProperty(configPropertiesFile, "MessageLimit", 1000000);
-      }
-		
-   	// Read limit on number of error messages produced by one assemble operation.
-       private static int getErrorLimit() {
-         return getIntegerProperty(configPropertiesFile, "ErrorLimit", 200);
-      }
-   
-   	// Read backstep limit (number of operations to buffer) from properties file.
-       private static int getBackstepLimit() {
-         return getIntegerProperty(configPropertiesFile, "BackstepLimit", 1000);
-      } 
-		
-   	// Read ASCII default display character for non-printing characters, from properties file.
-       public static String getAsciiNonPrint() {
-		   String anp = getPropertyEntry(configPropertiesFile, "AsciiNonPrint");
-			return (anp == null) ? "." : ( (anp.equals("space")) ? " " : anp );
-      }    
-		
-   	// Read ASCII strings for codes 0-255, from properties file. If string
-		// value is "null", substitute value of ASCII_NON_PRINT.  If string is
-		// "space", substitute string containing one space character.
-       public static String[] getAsciiStrings() {
-		   String let = getPropertyEntry(configPropertiesFile,"AsciiTable");
-		   String placeHolder = getAsciiNonPrint();
-			String[] lets = let.split(" +");			
-			int maxLength = 0;
-			for (int i = 0; i < lets.length; i++) {
-			    if (lets[i].equals("null")) lets[i] = placeHolder;
-				 if (lets[i].equals("space")) lets[i] = " ";
-				 if (lets[i].length() > maxLength) maxLength = lets[i].length();
-			}
-			String padding = "        ";
-			maxLength++;
-			for (int i = 0; i < lets.length; i++) {
-             lets[i] = padding.substring(0,maxLength-lets[i].length()) + lets[i];
-			}
-			return lets;
-      }   
-			
-      // Read and return integer property value for given file and property name.
-   	// Default value is returned if property file or name not found.
-       private static int getIntegerProperty(String propertiesFile, String propertyName, int defaultValue) {
-         int limit = defaultValue;  // just in case no entry is found
-         Properties properties = PropertiesFile.loadPropertiesFromFile(propertiesFile);
-         try {
+            debug = false;
+            memory.clear(); // will establish memory configuration from setting
+        }
+    }
+
+    // Read byte limit of Run I/O or MARS Messages text to buffer.
+    private static int getMessageLimit() {
+        return getIntegerProperty(configPropertiesFile, "MessageLimit", 1000000);
+    }
+
+    // Read limit on number of error messages produced by one assemble operation.
+    private static int getErrorLimit() {
+        return getIntegerProperty(configPropertiesFile, "ErrorLimit", 200);
+    }
+
+    // Read backstep limit (number of operations to buffer) from properties file.
+    private static int getBackstepLimit() {
+        return getIntegerProperty(configPropertiesFile, "BackstepLimit", 1000);
+    }
+
+    // Read ASCII default display character for non-printing characters, from properties file.
+    public static String getAsciiNonPrint() {
+        String anp = getPropertyEntry(configPropertiesFile, "AsciiNonPrint");
+        return (anp == null) ? "." : ((anp.equals("space")) ? " " : anp);
+    }
+
+    // Read ASCII strings for codes 0-255, from properties file. If string
+    // value is "null", substitute value of ASCII_NON_PRINT.  If string is
+    // "space", substitute string containing one space character.
+    public static String[] getAsciiStrings() {
+        String let = getPropertyEntry(configPropertiesFile, "AsciiTable");
+        String placeHolder = getAsciiNonPrint();
+        String[] lets = let.split(" +");
+        int maxLength = 0;
+        for (int i = 0; i < lets.length; i++) {
+            if (lets[i].equals("null")) lets[i] = placeHolder;
+            if (lets[i].equals("space")) lets[i] = " ";
+            if (lets[i].length() > maxLength) maxLength = lets[i].length();
+        }
+        String padding = "        ";
+        maxLength++;
+        for (int i = 0; i < lets.length; i++) {
+            lets[i] = padding.substring(0, maxLength - lets[i].length()) + lets[i];
+        }
+        return lets;
+    }
+
+    // Read and return integer property value for given file and property name.
+    // Default value is returned if property file or name not found.
+    private static int getIntegerProperty(String propertiesFile, String propertyName, int defaultValue) {
+        int limit = defaultValue;  // just in case no entry is found
+        Properties properties = PropertiesFile.loadPropertiesFromFile(propertiesFile);
+        try {
             limit = Integer.parseInt(properties.getProperty(propertyName, Integer.toString(defaultValue)));
-         } 
-             catch (NumberFormatException nfe) { } // do nothing, I already have a default
-         return limit;
-      }
-   
-   
-   	// Read assembly language file extensions from properties file.  Resulting
-   	// string is tokenized into array list (assume StringTokenizer default delimiters).
-       private static ArrayList getFileExtensions() {
-         ArrayList extensionsList = new ArrayList();
-         String extensions = getPropertyEntry(configPropertiesFile,"Extensions");
-         if (extensions != null) {
-            StringTokenizer st = new StringTokenizer(extensions); 
-            while (st.hasMoreTokens()) { 
-               extensionsList.add(st.nextToken()); 
-            } 
-         }
-         return extensionsList;
-      }
-   
-      /**
-   	 * Get list of MarsTools that reside outside the MARS distribution. 
-   	 * Currently this is done by adding the tool's path name to the list
-   	 * of values for the external_tools property. Use ";" as delimiter!
-   	 * @return ArrayList.  Each item is file path to .class file
-   	 * of a class that implements MarsTool.  If none, returns empty list.
-   	 */
-       public static ArrayList getExternalTools() {
-         ArrayList toolsList = new ArrayList();
-         String delimiter = ";";
-         String tools = getPropertyEntry(configPropertiesFile,"ExternalTools");
-         if (tools != null) {
-            StringTokenizer st = new StringTokenizer(tools, delimiter); 
-            while (st.hasMoreTokens()) { 
-               toolsList.add(st.nextToken()); 
-            } 
-         }
-         return toolsList;
-      }
-   	
-   	/**
-   	 * Read and return property file value (if any) for requested property.
-   	 * @param propertiesFile  name of properties file (do NOT include filename extension,
-   	 * which is assumed to be ".properties")
-   	 * @param propertyName String containing desired property name
-   	 * @return String containing associated value; null if property not found
-   	 */
-       public static String getPropertyEntry(String propertiesFile, String propertyName) {
-         return PropertiesFile.loadPropertiesFromFile(propertiesFile).getProperty(propertyName);
-      }
-   	   
-   	/**
-   	 * Read any syscall number assignment overrides from config file.
-   	 * @return ArrayList of SyscallNumberOverride objects
-   	 */
-       public ArrayList getSyscallOverrides() {
-         ArrayList overrides = new ArrayList();
-         Properties properties = PropertiesFile.loadPropertiesFromFile(syscallPropertiesFile);
-         Enumeration keys = properties.keys();
-         while (keys.hasMoreElements()) {
+        } catch (NumberFormatException nfe) {
+        } // do nothing, I already have a default
+        return limit;
+    }
+
+
+    // Read assembly language file extensions from properties file.  Resulting
+    // string is tokenized into array list (assume StringTokenizer default delimiters).
+    private static ArrayList getFileExtensions() {
+        ArrayList extensionsList = new ArrayList();
+        String extensions = getPropertyEntry(configPropertiesFile, "Extensions");
+        if (extensions != null) {
+            StringTokenizer st = new StringTokenizer(extensions);
+            while (st.hasMoreTokens()) {
+                extensionsList.add(st.nextToken());
+            }
+        }
+        return extensionsList;
+    }
+
+    /**
+     * Get list of MarsTools that reside outside the MARS distribution.
+     * Currently this is done by adding the tool's path name to the list
+     * of values for the external_tools property. Use ";" as delimiter!
+     *
+     * @return ArrayList.  Each item is file path to .class file
+     * of a class that implements MarsTool.  If none, returns empty list.
+     */
+    public static ArrayList getExternalTools() {
+        ArrayList toolsList = new ArrayList();
+        String delimiter = ";";
+        String tools = getPropertyEntry(configPropertiesFile, "ExternalTools");
+        if (tools != null) {
+            StringTokenizer st = new StringTokenizer(tools, delimiter);
+            while (st.hasMoreTokens()) {
+                toolsList.add(st.nextToken());
+            }
+        }
+        return toolsList;
+    }
+
+    /**
+     * Read and return property file value (if any) for requested property.
+     *
+     * @param propertiesFile name of properties file (do NOT include filename extension,
+     *                       which is assumed to be ".properties")
+     * @param propertyName   String containing desired property name
+     * @return String containing associated value; null if property not found
+     */
+    public static String getPropertyEntry(String propertiesFile, String propertyName) {
+        return PropertiesFile.loadPropertiesFromFile(propertiesFile).getProperty(propertyName);
+    }
+
+    /**
+     * Read any syscall number assignment overrides from config file.
+     *
+     * @return ArrayList of SyscallNumberOverride objects
+     */
+    public ArrayList getSyscallOverrides() {
+        ArrayList overrides = new ArrayList();
+        Properties properties = PropertiesFile.loadPropertiesFromFile(syscallPropertiesFile);
+        Enumeration keys = properties.keys();
+        while (keys.hasMoreElements()) {
             String key = (String) keys.nextElement();
-            overrides.add(new SyscallNumberOverride(key,properties.getProperty(key)));
-         }
-         return overrides;
-      }
-   
-   }
+            overrides.add(new SyscallNumberOverride(key, properties.getProperty(key)));
+        }
+        return overrides;
+    }
+
+}

src/main/java/mars/mips/hardware/Memory.java

@@ -1,9 +1,13 @@
-   package mars.mips.hardware;
-   import mars.*;
-   import mars.util.*;
-   import mars.simulator.*;
-   import mars.mips.instructions.*;
-   import java.util.*;
+package mars.mips.hardware;
+
+import mars.Globals;
+import mars.ProgramStatement;
+import mars.Settings;
+import mars.mips.instructions.Instruction;
+import mars.simulator.Exceptions;
+import mars.util.Binary;
+
+import java.util.*;
 	
 	/*
 Copyright (c) 2003-2009,  Pete Sanderson and Kenneth Vollmar
@@ -768,11 +772,11 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
             value = fetchWordOrNullFromTable(stackBlockTable, relative);
          }
          else if (inTextSegment(address) || inKernelTextSegment(address)) {
-            try { 
-               value = (getStatementNoNotify(address) == null) ? null : new Integer(getStatementNoNotify(address).getBinaryStatement());
-            } 
-                catch (AddressErrorException aee) { 
-                  value = null;               }
+             try {
+                 value = (getStatementNoNotify(address) == null) ? null : getStatementNoNotify(address).getBinaryStatement();
+             } catch (AddressErrorException aee) {
+                 value = null;
+             }
          }  
          else if (inKernelDataSegment(address)) {
               // in kernel data segment
@@ -1382,7 +1386,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
          else {
             value = blockTable[block][offset];
          }
-         return new Integer(value);
+           return value;
       }
    	   
    ////////////////////////////////////////////////////////////////////////////////////

src/main/java/mars/mips/instructions/InstructionSet.java

@@ -1,11 +1,25 @@
-   package mars.mips.instructions;
-   import mars.simulator.*;
-   import mars.mips.hardware.*;
-   import mars.mips.instructions.syscalls.*;
-   import mars.*;
-   import mars.util.*;
-   import java.util.*;
-   import java.io.*;
+package mars.mips.instructions;
+
+import mars.Globals;
+import mars.ProcessingException;
+import mars.ProgramStatement;
+import mars.mips.hardware.AddressErrorException;
+import mars.mips.hardware.Coprocessor0;
+import mars.mips.hardware.Coprocessor1;
+import mars.mips.hardware.RegisterFile;
+import mars.mips.instructions.syscalls.Syscall;
+import mars.simulator.DelayedBranch;
+import mars.simulator.Exceptions;
+import mars.util.Binary;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.StringTokenizer;
 	
 	/*
 Copyright (c) 2003-2013,  Pete Sanderson and Kenneth Vollmar
@@ -1672,7 +1686,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
                         round = Integer.MAX_VALUE;
                      } 
                      else {
-                        Float floatObj = new Float(floatValue);
+                         Float floatObj = floatValue;
                         // If we are EXACTLY in the middle, then round to even!  To determine this,
                         // find next higher integer and next lower integer, then see if distances 
                         // are exactly equal.
@@ -1920,7 +1934,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
                         round = Integer.MAX_VALUE;
                      } 
                      else {
-                        Double doubleObj = new Double(doubleValue);
+                         Double doubleObj = doubleValue;
                         // If we are EXACTLY in the middle, then round to even!  To determine this,
                         // find next higher integer and next lower integer, then see if distances 
                         // are exactly equal.

src/main/java/mars/mips/instructions/syscalls/SyscallPrintFloat.java

@@ -1,7 +1,9 @@
-   package mars.mips.instructions.syscalls;
-   import mars.util.*;
-   import mars.mips.hardware.*;
-   import mars.*;
+package mars.mips.instructions.syscalls;
+
+import mars.ProcessingException;
+import mars.ProgramStatement;
+import mars.mips.hardware.Coprocessor1;
+import mars.util.SystemIO;
 
 /*
 Copyright (c) 2003-2006,  Pete Sanderson and Kenneth Vollmar
@@ -44,12 +46,12 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
        public SyscallPrintFloat() {
          super(2, "PrintFloat");
       }
-      
-   /**
-   * Performs syscall function to display float whose bits are stored in $f12
-   */
-       public void simulate(ProgramStatement statement) throws ProcessingException {
-         SystemIO.printString(new Float(Float.intBitsToFloat(
-                                Coprocessor1.getValue(12))).toString());
-      }
-   }
+
+    /**
+     * Performs syscall function to display float whose bits are stored in $f12
+     */
+    public void simulate(ProgramStatement statement) throws ProcessingException {
+        SystemIO.printString(Float.toString(Float.intBitsToFloat(
+                Coprocessor1.getValue(12))));
+    }
+}

src/main/java/mars/mips/instructions/syscalls/SyscallPrintInt.java

@@ -1,7 +1,9 @@
-   package mars.mips.instructions.syscalls;
-   import mars.util.*;
-   import mars.mips.hardware.*;
-   import mars.*;
+package mars.mips.instructions.syscalls;
+
+import mars.ProcessingException;
+import mars.ProgramStatement;
+import mars.mips.hardware.RegisterFile;
+import mars.util.SystemIO;
 
 /*
 Copyright (c) 2003-2006,  Pete Sanderson and Kenneth Vollmar
@@ -50,7 +52,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    * Performs syscall function to print on the console the integer stored in $a0.
    */
        public void simulate(ProgramStatement statement) throws ProcessingException {
-         SystemIO.printString(
-             new Integer(RegisterFile.getValue(4)).toString());
-      }
-   }
+           SystemIO.printString(
+                   Integer.toString(RegisterFile.getValue(4)));
+       }
+   }

src/main/java/mars/tools/DigitalLabSim.java

@@ -1,356 +1,357 @@
-package mars.tools;
-import java.awt.*;
-import java.awt.event.*;
-import java.util.*;
-
-import javax.swing.*;
-import javax.swing.Timer;
-
-import mars.Globals;
-import mars.mips.hardware.AddressErrorException;
-import mars.mips.hardware.Coprocessor0;
-import mars.mips.hardware.Memory;
-import mars.mips.hardware.MemoryAccessNotice;
-import mars.simulator.Exceptions;
-@SuppressWarnings("serial")
-/* Add these two lines in exceptions.java file
- * public static final int EXTERNAL_INTERRUPT_TIMER = 0x00000100; //Add for digital Lab Sim
- * public static final int EXTERNAL_INTERRUPT_HEXA_KEYBOARD = 0x00000200;// Add for digital Lab Sim
-*/
-
-/*
- * Didier Teifreto LIFC Université de franche-Comté www.lifc.univ-fcomte.fr/~teifreto
- * didier.teifreto@univ-fcomte.fr
- */
-public class DigitalLabSim extends AbstractMarsToolAndApplication {
-	private static String heading =  "Digital Lab Sim";
-	private static String version = " Version 1.0 (Didier Teifreto)";
-	private static final int IN_ADRESS_DISPLAY_1=Memory.memoryMapBaseAddress+0x10;
-	private static final int IN_ADRESS_DISPLAY_2=Memory.memoryMapBaseAddress+0x11;
-	private static final int IN_ADRESS_HEXA_KEYBOARD=Memory.memoryMapBaseAddress+0x12;
-	private static final int IN_ADRESS_COUNTER=Memory.memoryMapBaseAddress+0x13;
-	private static final int OUT_ADRESS_HEXA_KEYBOARD=Memory.memoryMapBaseAddress+0x14;
-
-  public static final int EXTERNAL_INTERRUPT_TIMER = 0x00000100; //Add for digital Lab Sim
-  public static final int EXTERNAL_INTERRUPT_HEXA_KEYBOARD = 0x00000200;// Add for digital Lab Sim
-
-	// GUI Interface. 
-   	private static JPanel panelTools;
-   	// Seven Segment display
-	private SevenSegmentPanel sevenSegPanel;
-	// Keyboard
-	private static int KeyBoardValueButtonClick=-1; // -1 no button click
-	private HexaKeyboard hexaKeyPanel;
-	private static boolean KeyboardInterruptOnOff=false;
-	// Counter
-	private static int CounterValueMax=30; 
-	private static int CounterValue=CounterValueMax;
-	private static boolean CounterInterruptOnOff=false;
-	private static OneSecondCounter SecondCounter;
-
-	public DigitalLabSim(String title, String heading) {
-		super(title,heading);
-	}
-	public DigitalLabSim() {
-		super (heading+", "+version, heading);
-	}
-	public static void main(String[] args) {
-		new DigitalLabSim(heading+", "+version,heading).go();
-	}
-	public String getName() {
-		return "Digital Lab Sim";
-	}
-	protected void addAsObserver(){
-    	addAsObserver(IN_ADRESS_DISPLAY_1, IN_ADRESS_DISPLAY_1);
-    	addAsObserver(Memory.textBaseAddress, Memory.textLimitAddress);
-    }
-	public void update(Observable ressource, Object accessNotice){
-    	MemoryAccessNotice notice = (MemoryAccessNotice) accessNotice;
-    	int address=notice.getAddress();
-    	char value=(char)notice.getValue();
-    	if(address == IN_ADRESS_DISPLAY_1)
-    			updateSevenSegment(1, value);
-    	else
-    		if  (address == IN_ADRESS_DISPLAY_2)
-    			updateSevenSegment(0, value);
-    		else
-    			if (address == IN_ADRESS_HEXA_KEYBOARD)
-    				updateHexaKeyboard(value);
-    			else
-    				if (address == IN_ADRESS_COUNTER)
-    					updateOneSecondCounter(value);
-    	if  (CounterInterruptOnOff)
-    		if (CounterValue >0){
-    			CounterValue--;
-    		}
-    		else{
-    			CounterValue=CounterValueMax;
-    			if((Coprocessor0.getValue(Coprocessor0.STATUS) & 2)==0){
-    				mars.simulator.Simulator.externalInterruptingDevice = /*Exceptions.*/EXTERNAL_INTERRUPT_TIMER;
-    			}
-    		}
-	}
-	protected void reset(){
-    	sevenSegPanel.resetSevenSegment();
-    	hexaKeyPanel.resetHexaKeyboard();
-    	SecondCounter.resetOneSecondCounter();
-    }
-    protected JComponent buildMainDisplayArea() {
-    	panelTools=new JPanel(new GridLayout(1,2));
-    	sevenSegPanel=new SevenSegmentPanel();
-	 	panelTools.add(sevenSegPanel);
-	 	hexaKeyPanel = new HexaKeyboard();
-	 	panelTools.add(hexaKeyPanel);
-	 	SecondCounter= new OneSecondCounter();
-	   	return panelTools;
-    }
-    private synchronized void updateMMIOControlAndData(int dataAddr, int dataValue) {
-        if (!this.isBeingUsedAsAMarsTool || (this.isBeingUsedAsAMarsTool && connectButton.isConnected())) {
-           synchronized (Globals.memoryAndRegistersLock) {
-              try {
-              		Globals.memory.setByte(dataAddr, dataValue);
-              } 
-                  catch (AddressErrorException aee) {
-                    System.out.println("Tool author specified incorrect MMIO address!"+aee);
-                    System.exit(0);
-                 }
-           }
-           if (Globals.getGui() != null && Globals.getGui().getMainPane().getExecutePane().getTextSegmentWindow().getCodeHighlighting() ) {
-              Globals.getGui().getMainPane().getExecutePane().getDataSegmentWindow().updateValues();
-           }
-        }
-     }
-    protected JComponent getHelpComponent() {
-        final String helpContent = 
-        	" This tool is composed of 3 parts : two seven-segment displays, an hexadecimal keyboard and counter \n"+
-        	"Seven segment display\n"+
-        	" Byte value at address 0xFFFF0010 : command right seven segment display \n "+
-        	" Byte value at address 0xFFFF0011 : command left seven segment display \n "+
-        	" Each bit of these two bytes are connected to segments (bit 0 for a segment, 1 for b segment and 7 for point \n \n"+
-        	"Hexadecimal keyboard\n"+
-        	" Byte value at address 0xFFFF0012 : command row number of hexadecimal keyboard (bit 0 to 3) and enable keyboard interrupt (bit 7) \n" +
-        	" Byte value at address 0xFFFF0014 : receive row and column of the key pressed, 0 if not key pressed \n"+
-        	" The mips program have to scan, one by one, each row (send 1,2,4,8...)"+
-        	" and then observe if a key is pressed (that mean byte value at adresse 0xFFFF0014 is different from zero). "+
-        	" This byte value is composed of row number (4 left bits) and column number (4 right bits)"+
-        	" Here you'll find the code for each key : 0x11,0x21,0x41,0x81,0x12,0x22,0x42,0x82,0x14,0x24,0x44,0x84,0x18,0x28,0x48,0x88. \n"+
-        	" For exemple key number 2 return 0x41, that mean the key is on column 3 and row 1. \n"+
-        	" If keyboard interruption is enable, an exception is started, with cause register bit number 11 set.\n \n"+
-        	"Counter\n"+
-        	" Byte value at address 0xFFFF0013 : If one bit of this byte is set, the counter interruption is enable.\n"+
-        	" If counter interruption is enable, every 30 instructions, an exception is started with cause register bit number 10.\n" +
-			"   (contributed by Didier Teifreto, dteifreto@lifc.univ-fcomte.fr)"
-        	;
-        JButton help = new JButton("Help");
-        help.addActionListener(
-        		new ActionListener() {
-        			public void actionPerformed(ActionEvent e) {
-        				JTextArea ja = new JTextArea(helpContent);
-        				ja.setRows(20);
-        				ja.setColumns(60);
-        				ja.setLineWrap(true);
-        				ja.setWrapStyleWord(true);
-        				JOptionPane.showMessageDialog(theWindow, new JScrollPane(ja),
-                        "Simulating the Hexa Keyboard and Seven segment display", JOptionPane.INFORMATION_MESSAGE);
-        			}
-        		});		
-        return help;  
-    }/* ....................Seven Segment display start here................................... */
-   /* ...........................Seven segment display start here ..............................*/
-    public void updateSevenSegment(int number,char value) {
-    	sevenSegPanel.display[number].modifyDisplay(value);
-    }
-    public class SevenSegmentDisplay extends JComponent {
-    	public char aff;
-    	public SevenSegmentDisplay(char aff){
-    		this.aff=aff;
-    		this.setPreferredSize(new Dimension(60,80));
-    	}
-    	public void modifyDisplay(char val){
-    		aff=val;
-    		this.repaint();
-    	}
-    	public void SwitchSegment(Graphics g,char segment){
-    		switch(segment){
-    		case 'a': //a segment
-    			int[]pxa1={12,9,12};
-    			int[]pxa2={36,39,36};
-    			int[]pya={5,8,11};
-    			g.fillPolygon(pxa1,pya, 3);
-    			g.fillPolygon(pxa2,pya, 3);
-    			g.fillRect(12,5,24,6);
-    			break;
-    		case 'b': //b segment	
-    			int[]pxb={37,40,43};
-    			int[]pyb1={12,9,12};
-    			int[]pyb2={36,39,36};
-    			g.fillPolygon(pxb,pyb1, 3);
-    			g.fillPolygon(pxb,pyb2, 3);
-    			g.fillRect(37,12,6,24);
-    			break;
-    		case 'c': // c segment
-    			int[]pxc={37,40,43};
-    			int[]pyc1={44,41,44};
-    			int[]pyc2={68,71,68};
-    			g.fillPolygon(pxc,pyc1, 3);
-    			g.fillPolygon(pxc,pyc2, 3);
-    			g.fillRect(37,44,6,24);
-    			break;
-    		case 'd': // d segment
-    			int[]pxd1={12,9,12};
-    			int[]pxd2={36,39,36};
-    			int[]pyd={69,72,75};
-    			g.fillPolygon(pxd1,pyd, 3);
-    			g.fillPolygon(pxd2,pyd, 3);
-    			g.fillRect(12,69,24,6);
-    			break;
-    		case 'e': // e segment
-    			int[]pxe={5,8,11};
-    			int[]pye1={44,41,44};
-    			int[]pye2={68,71,68};
-    			g.fillPolygon(pxe,pye1, 3);
-    			g.fillPolygon(pxe,pye2, 3);
-    			g.fillRect(5,44,6,24);
-    			break;
-    		case 'f': // f segment
-    			int[]pxf={5,8,11};
-    			int[]pyf1={12,9,12};
-    			int[]pyf2={36,39,36};
-    			g.fillPolygon(pxf,pyf1, 3);
-    			g.fillPolygon(pxf,pyf2, 3);
-    			g.fillRect(5,12,6,24);
-    			break;
-    		case 'g': // g segment 
-    			int[]pxg1={12,9,12};
-    			int[]pxg2={36,39,36};
-    			int[]pyg={37,40,43};
-    			g.fillPolygon(pxg1,pyg, 3);
-    			g.fillPolygon(pxg2,pyg, 3);
-    			g.fillRect(12,37,24,6);
-    			break;
-    		case 'h': // decimal point
-    			g.fillOval(49,68,8,8);
-    			break;
-    		}	
-    	}
-    	public void paint(Graphics g) {
-    		char c='a';	
-    		while(c<='h'){			
-    			if ((aff & 0x1) == 1)
-    				g.setColor(Color.RED);
-    			else
-    				g.setColor(Color.LIGHT_GRAY);
-    			SwitchSegment(g,c);
-				aff = (char)(aff  >>>1);
-				c++;
-    		}
-    	}
-    }
-    public class SevenSegmentPanel extends JPanel {
-    	public SevenSegmentDisplay[] display;
-    	public SevenSegmentPanel(){
-    		int i;
-    		FlowLayout fl= new FlowLayout();
-    		this.setLayout(fl);
-    		display= new SevenSegmentDisplay[2];
-    		for (i=0;i<2;i++){
-    			display[i]= new SevenSegmentDisplay((char)(0)); 
-    			this.add(display[i]);
-    		}
-    	}	
-    	public void modifyDisplay(int num,char val){
-    		display[num].modifyDisplay(val); 
-    		display[num].repaint();
-    	}
-    	public void resetSevenSegment() {
-    		int i;
-    		for (i=0;i<2;i++)   		
-    	  	  modifyDisplay(i, (char)0);
-    	   }
-    }
- /* ...........................Seven segment display end here ..............................*/
-/* ....................Hexa Keyboard start here................................... */
-    public void updateHexaKeyboard(char row) {
-    	int key = KeyBoardValueButtonClick;
-    	if ((key !=-1)&& ((1 << (key / 4))==(row & 0xF))){	
-    		updateMMIOControlAndData(OUT_ADRESS_HEXA_KEYBOARD, 
-    				(char)(1 << (key / 4)) | (1 << (4+(key%4))));
-    	}
-    	else{
-    		updateMMIOControlAndData(OUT_ADRESS_HEXA_KEYBOARD, 0);
-    	}
-    	if ((row & 0xF0) != 0) 
-    		KeyboardInterruptOnOff = true;
-    	else
-    		KeyboardInterruptOnOff = false;
-    }
-    public class HexaKeyboard extends JPanel{
-		public JButton[] button;	
-		public HexaKeyboard(){
-			int i;
-			GridLayout layout = new GridLayout(4,4);
-			this.setLayout(layout);
-			button = new JButton[16];
-			for (i=0;i<16;i++){
-				button[i]= new JButton(Integer.toHexString(i)); 
-				button[i].setBackground(Color.WHITE);
-				button[i].setMargin(new Insets(10,10,10,10));
-				button[i].addMouseListener(new EcouteurClick(i));
-				this.add(button[i]);
-			}	
-		}
-	    public void resetHexaKeyboard(){
-	    	int i;
-	 	   	KeyBoardValueButtonClick=-1;
-	 	   	for(i=0;i<16;i++){
-	 	   		button[i].setBackground(Color.WHITE);
-	 	   	}
-	    }
-		public class EcouteurClick implements MouseListener{
-			private int buttonValue;
-			public EcouteurClick(int val){ 
-				buttonValue=val;
-			}
-			public void mouseEntered(MouseEvent arg0) { }
-			public void mouseExited(MouseEvent arg0) {}			
-			public void mousePressed(MouseEvent arg0) {}
-			public void mouseReleased(MouseEvent arg0) {}
-			public void mouseClicked(MouseEvent arg0) {
-				int i;
-				if(KeyBoardValueButtonClick!=-1){//Button already pressed -> now realease
-					KeyBoardValueButtonClick = -1;
-					updateMMIOControlAndData(OUT_ADRESS_HEXA_KEYBOARD,0);
-					for(i=0;i<16;i++) 
-						button[i].setBackground(Color.WHITE);
-				}
-				else{ // new button pressed
-					KeyBoardValueButtonClick = buttonValue;
-					button[KeyBoardValueButtonClick].setBackground(Color.GREEN);
-					if( KeyboardInterruptOnOff &&  (Coprocessor0.getValue(Coprocessor0.STATUS) & 2)==0){
-						mars.simulator.Simulator.externalInterruptingDevice = /*Exceptions.*/EXTERNAL_INTERRUPT_HEXA_KEYBOARD;
-					}
-				}
-			}
-		}
-    }
-/* ....................Hexa Keyboard end here................................... */
-/* ....................Timer start here................................... */
-    public void updateOneSecondCounter(char value) {
-    	if (value !=0){
-    		CounterInterruptOnOff=true;
-    		CounterValue=CounterValueMax;
-    	}
-    	else{
-    		CounterInterruptOnOff=false;
-    	}
-    }
-    public class OneSecondCounter{
-    	public OneSecondCounter(){
-    		CounterInterruptOnOff=false;
-    	}
- 	    public void resetOneSecondCounter(){
-	    	CounterInterruptOnOff=false;
-	    	CounterValue=CounterValueMax;
-	    }
-    }
-}
+package mars.tools;
+
+import mars.Globals;
+import mars.mips.hardware.AddressErrorException;
+import mars.mips.hardware.Coprocessor0;
+import mars.mips.hardware.Memory;
+import mars.mips.hardware.MemoryAccessNotice;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.util.Observable;
+@SuppressWarnings("serial")
+/* Add these two lines in exceptions.java file
+ * public static final int EXTERNAL_INTERRUPT_TIMER = 0x00000100; //Add for digital Lab Sim
+ * public static final int EXTERNAL_INTERRUPT_HEXA_KEYBOARD = 0x00000200;// Add for digital Lab Sim
+*/
+
+/*
+ * Didier Teifreto LIFC Université de franche-Comté www.lifc.univ-fcomte.fr/~teifreto
+ * didier.teifreto@univ-fcomte.fr
+ */
+public class DigitalLabSim extends AbstractMarsToolAndApplication {
+	private static String heading =  "Digital Lab Sim";
+	private static String version = " Version 1.0 (Didier Teifreto)";
+	private static final int IN_ADRESS_DISPLAY_1=Memory.memoryMapBaseAddress+0x10;
+	private static final int IN_ADRESS_DISPLAY_2=Memory.memoryMapBaseAddress+0x11;
+	private static final int IN_ADRESS_HEXA_KEYBOARD=Memory.memoryMapBaseAddress+0x12;
+	private static final int IN_ADRESS_COUNTER=Memory.memoryMapBaseAddress+0x13;
+	private static final int OUT_ADRESS_HEXA_KEYBOARD=Memory.memoryMapBaseAddress+0x14;
+
+  public static final int EXTERNAL_INTERRUPT_TIMER = 0x00000100; //Add for digital Lab Sim
+  public static final int EXTERNAL_INTERRUPT_HEXA_KEYBOARD = 0x00000200;// Add for digital Lab Sim
+
+	// GUI Interface. 
+   	private static JPanel panelTools;
+   	// Seven Segment display
+	private SevenSegmentPanel sevenSegPanel;
+	// Keyboard
+	private static int KeyBoardValueButtonClick=-1; // -1 no button click
+	private HexaKeyboard hexaKeyPanel;
+	private static boolean KeyboardInterruptOnOff=false;
+	// Counter
+	private static int CounterValueMax=30; 
+	private static int CounterValue=CounterValueMax;
+	private static boolean CounterInterruptOnOff=false;
+	private static OneSecondCounter SecondCounter;
+
+	public DigitalLabSim(String title, String heading) {
+		super(title,heading);
+	}
+	public DigitalLabSim() {
+		super (heading+", "+version, heading);
+	}
+	public static void main(String[] args) {
+		new DigitalLabSim(heading+", "+version,heading).go();
+	}
+	public String getName() {
+		return "Digital Lab Sim";
+	}
+	protected void addAsObserver(){
+    	addAsObserver(IN_ADRESS_DISPLAY_1, IN_ADRESS_DISPLAY_1);
+    	addAsObserver(Memory.textBaseAddress, Memory.textLimitAddress);
+    }
+	public void update(Observable ressource, Object accessNotice){
+    	MemoryAccessNotice notice = (MemoryAccessNotice) accessNotice;
+    	int address=notice.getAddress();
+    	char value=(char)notice.getValue();
+    	if(address == IN_ADRESS_DISPLAY_1)
+    			updateSevenSegment(1, value);
+    	else
+    		if  (address == IN_ADRESS_DISPLAY_2)
+    			updateSevenSegment(0, value);
+    		else
+    			if (address == IN_ADRESS_HEXA_KEYBOARD)
+    				updateHexaKeyboard(value);
+    			else
+    				if (address == IN_ADRESS_COUNTER)
+    					updateOneSecondCounter(value);
+    	if  (CounterInterruptOnOff)
+    		if (CounterValue >0){
+    			CounterValue--;
+    		}
+    		else{
+    			CounterValue=CounterValueMax;
+    			if((Coprocessor0.getValue(Coprocessor0.STATUS) & 2)==0){
+    				mars.simulator.Simulator.externalInterruptingDevice = /*Exceptions.*/EXTERNAL_INTERRUPT_TIMER;
+    			}
+    		}
+	}
+	protected void reset(){
+    	sevenSegPanel.resetSevenSegment();
+    	hexaKeyPanel.resetHexaKeyboard();
+    	SecondCounter.resetOneSecondCounter();
+    }
+    protected JComponent buildMainDisplayArea() {
+    	panelTools=new JPanel(new GridLayout(1,2));
+    	sevenSegPanel=new SevenSegmentPanel();
+	 	panelTools.add(sevenSegPanel);
+	 	hexaKeyPanel = new HexaKeyboard();
+	 	panelTools.add(hexaKeyPanel);
+	 	SecondCounter= new OneSecondCounter();
+	   	return panelTools;
+    }
+    private synchronized void updateMMIOControlAndData(int dataAddr, int dataValue) {
+        if (!this.isBeingUsedAsAMarsTool || (this.isBeingUsedAsAMarsTool && connectButton.isConnected())) {
+           synchronized (Globals.memoryAndRegistersLock) {
+              try {
+              		Globals.memory.setByte(dataAddr, dataValue);
+              } 
+                  catch (AddressErrorException aee) {
+                    System.out.println("Tool author specified incorrect MMIO address!"+aee);
+                    System.exit(0);
+                 }
+           }
+           if (Globals.getGui() != null && Globals.getGui().getMainPane().getExecutePane().getTextSegmentWindow().getCodeHighlighting() ) {
+              Globals.getGui().getMainPane().getExecutePane().getDataSegmentWindow().updateValues();
+           }
+        }
+     }
+    protected JComponent getHelpComponent() {
+        final String helpContent = 
+        	" This tool is composed of 3 parts : two seven-segment displays, an hexadecimal keyboard and counter \n"+
+        	"Seven segment display\n"+
+        	" Byte value at address 0xFFFF0010 : command right seven segment display \n "+
+        	" Byte value at address 0xFFFF0011 : command left seven segment display \n "+
+        	" Each bit of these two bytes are connected to segments (bit 0 for a segment, 1 for b segment and 7 for point \n \n"+
+        	"Hexadecimal keyboard\n"+
+        	" Byte value at address 0xFFFF0012 : command row number of hexadecimal keyboard (bit 0 to 3) and enable keyboard interrupt (bit 7) \n" +
+        	" Byte value at address 0xFFFF0014 : receive row and column of the key pressed, 0 if not key pressed \n"+
+        	" The mips program have to scan, one by one, each row (send 1,2,4,8...)"+
+        	" and then observe if a key is pressed (that mean byte value at adresse 0xFFFF0014 is different from zero). "+
+        	" This byte value is composed of row number (4 left bits) and column number (4 right bits)"+
+        	" Here you'll find the code for each key : 0x11,0x21,0x41,0x81,0x12,0x22,0x42,0x82,0x14,0x24,0x44,0x84,0x18,0x28,0x48,0x88. \n"+
+        	" For exemple key number 2 return 0x41, that mean the key is on column 3 and row 1. \n"+
+        	" If keyboard interruption is enable, an exception is started, with cause register bit number 11 set.\n \n"+
+        	"Counter\n"+
+        	" Byte value at address 0xFFFF0013 : If one bit of this byte is set, the counter interruption is enable.\n"+
+        	" If counter interruption is enable, every 30 instructions, an exception is started with cause register bit number 10.\n" +
+			"   (contributed by Didier Teifreto, dteifreto@lifc.univ-fcomte.fr)"
+        	;
+        JButton help = new JButton("Help");
+        help.addActionListener(
+        		new ActionListener() {
+        			public void actionPerformed(ActionEvent e) {
+        				JTextArea ja = new JTextArea(helpContent);
+        				ja.setRows(20);
+        				ja.setColumns(60);
+        				ja.setLineWrap(true);
+        				ja.setWrapStyleWord(true);
+        				JOptionPane.showMessageDialog(theWindow, new JScrollPane(ja),
+                        "Simulating the Hexa Keyboard and Seven segment display", JOptionPane.INFORMATION_MESSAGE);
+        			}
+        		});		
+        return help;  
+    }/* ....................Seven Segment display start here................................... */
+   /* ...........................Seven segment display start here ..............................*/
+    public void updateSevenSegment(int number,char value) {
+    	sevenSegPanel.display[number].modifyDisplay(value);
+    }
+    public class SevenSegmentDisplay extends JComponent {
+    	public char aff;
+    	public SevenSegmentDisplay(char aff){
+    		this.aff=aff;
+    		this.setPreferredSize(new Dimension(60,80));
+    	}
+    	public void modifyDisplay(char val){
+    		aff=val;
+    		this.repaint();
+    	}
+    	public void SwitchSegment(Graphics g,char segment){
+    		switch(segment){
+    		case 'a': //a segment
+    			int[]pxa1={12,9,12};
+    			int[]pxa2={36,39,36};
+    			int[]pya={5,8,11};
+    			g.fillPolygon(pxa1,pya, 3);
+    			g.fillPolygon(pxa2,pya, 3);
+    			g.fillRect(12,5,24,6);
+    			break;
+    		case 'b': //b segment	
+    			int[]pxb={37,40,43};
+    			int[]pyb1={12,9,12};
+    			int[]pyb2={36,39,36};
+    			g.fillPolygon(pxb,pyb1, 3);
+    			g.fillPolygon(pxb,pyb2, 3);
+    			g.fillRect(37,12,6,24);
+    			break;
+    		case 'c': // c segment
+    			int[]pxc={37,40,43};
+    			int[]pyc1={44,41,44};
+    			int[]pyc2={68,71,68};
+    			g.fillPolygon(pxc,pyc1, 3);
+    			g.fillPolygon(pxc,pyc2, 3);
+    			g.fillRect(37,44,6,24);
+    			break;
+    		case 'd': // d segment
+    			int[]pxd1={12,9,12};
+    			int[]pxd2={36,39,36};
+    			int[]pyd={69,72,75};
+    			g.fillPolygon(pxd1,pyd, 3);
+    			g.fillPolygon(pxd2,pyd, 3);
+    			g.fillRect(12,69,24,6);
+    			break;
+    		case 'e': // e segment
+    			int[]pxe={5,8,11};
+    			int[]pye1={44,41,44};
+    			int[]pye2={68,71,68};
+    			g.fillPolygon(pxe,pye1, 3);
+    			g.fillPolygon(pxe,pye2, 3);
+    			g.fillRect(5,44,6,24);
+    			break;
+    		case 'f': // f segment
+    			int[]pxf={5,8,11};
+    			int[]pyf1={12,9,12};
+    			int[]pyf2={36,39,36};
+    			g.fillPolygon(pxf,pyf1, 3);
+    			g.fillPolygon(pxf,pyf2, 3);
+    			g.fillRect(5,12,6,24);
+    			break;
+    		case 'g': // g segment 
+    			int[]pxg1={12,9,12};
+    			int[]pxg2={36,39,36};
+    			int[]pyg={37,40,43};
+    			g.fillPolygon(pxg1,pyg, 3);
+    			g.fillPolygon(pxg2,pyg, 3);
+    			g.fillRect(12,37,24,6);
+    			break;
+    		case 'h': // decimal point
+    			g.fillOval(49,68,8,8);
+    			break;
+    		}	
+    	}
+    	public void paint(Graphics g) {
+    		char c='a';	
+    		while(c<='h'){			
+    			if ((aff & 0x1) == 1)
+    				g.setColor(Color.RED);
+    			else
+    				g.setColor(Color.LIGHT_GRAY);
+    			SwitchSegment(g,c);
+				aff = (char)(aff  >>>1);
+				c++;
+    		}
+    	}
+    }
+    public class SevenSegmentPanel extends JPanel {
+    	public SevenSegmentDisplay[] display;
+    	public SevenSegmentPanel(){
+    		int i;
+    		FlowLayout fl= new FlowLayout();
+    		this.setLayout(fl);
+    		display= new SevenSegmentDisplay[2];
+    		for (i=0;i<2;i++){
+    			display[i]= new SevenSegmentDisplay((char)(0)); 
+    			this.add(display[i]);
+    		}
+    	}	
+    	public void modifyDisplay(int num,char val){
+    		display[num].modifyDisplay(val); 
+    		display[num].repaint();
+    	}
+    	public void resetSevenSegment() {
+    		int i;
+    		for (i=0;i<2;i++)   		
+    	  	  modifyDisplay(i, (char)0);
+    	   }
+    }
+ /* ...........................Seven segment display end here ..............................*/
+/* ....................Hexa Keyboard start here................................... */
+    public void updateHexaKeyboard(char row) {
+    	int key = KeyBoardValueButtonClick;
+    	if ((key !=-1)&& ((1 << (key / 4))==(row & 0xF))){	
+    		updateMMIOControlAndData(OUT_ADRESS_HEXA_KEYBOARD, 
+    				(char)(1 << (key / 4)) | (1 << (4+(key%4))));
+    	}
+    	else{
+    		updateMMIOControlAndData(OUT_ADRESS_HEXA_KEYBOARD, 0);
+    	}
+    	if ((row & 0xF0) != 0) 
+    		KeyboardInterruptOnOff = true;
+    	else
+    		KeyboardInterruptOnOff = false;
+    }
+    public class HexaKeyboard extends JPanel{
+		public JButton[] button;	
+		public HexaKeyboard(){
+			int i;
+			GridLayout layout = new GridLayout(4,4);
+			this.setLayout(layout);
+			button = new JButton[16];
+			for (i=0;i<16;i++){
+				button[i]= new JButton(Integer.toHexString(i)); 
+				button[i].setBackground(Color.WHITE);
+				button[i].setMargin(new Insets(10,10,10,10));
+				button[i].addMouseListener(new EcouteurClick(i));
+				this.add(button[i]);
+			}	
+		}
+	    public void resetHexaKeyboard(){
+	    	int i;
+	 	   	KeyBoardValueButtonClick=-1;
+	 	   	for(i=0;i<16;i++){
+	 	   		button[i].setBackground(Color.WHITE);
+	 	   	}
+	    }
+		public class EcouteurClick implements MouseListener{
+			private int buttonValue;
+			public EcouteurClick(int val){ 
+				buttonValue=val;
+			}
+			public void mouseEntered(MouseEvent arg0) { }
+			public void mouseExited(MouseEvent arg0) {}			
+			public void mousePressed(MouseEvent arg0) {}
+			public void mouseReleased(MouseEvent arg0) {}
+			public void mouseClicked(MouseEvent arg0) {
+				int i;
+				if(KeyBoardValueButtonClick!=-1){//Button already pressed -> now realease
+					KeyBoardValueButtonClick = -1;
+					updateMMIOControlAndData(OUT_ADRESS_HEXA_KEYBOARD,0);
+					for(i=0;i<16;i++) 
+						button[i].setBackground(Color.WHITE);
+				}
+				else{ // new button pressed
+					KeyBoardValueButtonClick = buttonValue;
+					button[KeyBoardValueButtonClick].setBackground(Color.GREEN);
+					if( KeyboardInterruptOnOff &&  (Coprocessor0.getValue(Coprocessor0.STATUS) & 2)==0){
+						mars.simulator.Simulator.externalInterruptingDevice = /*Exceptions.*/EXTERNAL_INTERRUPT_HEXA_KEYBOARD;
+					}
+				}
+			}
+		}
+    }
+/* ....................Hexa Keyboard end here................................... */
+/* ....................Timer start here................................... */
+    public void updateOneSecondCounter(char value) {
+    	if (value !=0){
+    		CounterInterruptOnOff=true;
+    		CounterValue=CounterValueMax;
+    	}
+    	else{
+    		CounterInterruptOnOff=false;
+    	}
+    }
+    public class OneSecondCounter{
+    	public OneSecondCounter(){
+    		CounterInterruptOnOff=false;
+    	}
+ 	    public void resetOneSecondCounter(){
+	    	CounterInterruptOnOff=false;
+	    	CounterValue=CounterValueMax;
+	    }
+    }
+}