Devices use start/end address

src/main/java/com/loomcom/symon/devices/Acia.java

@@ -75,7 +75,7 @@ public class Acia extends Device {
     private boolean txEmpty = true;
 
     public Acia(int address) throws MemoryRangeException {
-        super(address, ACIA_SIZE, "ACIA");
+        super(address, address + ACIA_SIZE - 1, "ACIA");
         this.baseAddress = address;
     }
 

src/main/java/com/loomcom/symon/devices/Device.java

@@ -41,14 +41,14 @@ public abstract class Device implements Comparable<Device> {
   /** Reference to the bus where this Device is attached. */
   private Bus bus;
 
-  public Device(int address, int size, String name)
+  public Device(int startAddress, int endAddress, String name)
     throws MemoryRangeException {
-    this.memoryRange = new MemoryRange(address, address + size - 1);
+    this.memoryRange = new MemoryRange(startAddress, endAddress);
     this.name = name;
   }
 
-  public Device(int address, int size) throws MemoryRangeException {
-    this(address, size, null);
+  public Device(int startAddress, int endAddress) throws MemoryRangeException {
+    this(startAddress, endAddress, null);
   }
 
   /* Methods required to be implemented by inheriting classes. */

src/main/java/com/loomcom/symon/devices/Memory.java

@@ -38,26 +38,26 @@ public class Memory extends Device {
     /* Initialize all locations to 0x00 (BRK) */
     private static final int DEFAULT_FILL = 0x00;
 
-    public Memory(int address, int size, boolean readOnly)
+    public Memory(int startAddress, int endAddress, boolean readOnly)
             throws MemoryRangeException {
-        super(address, size, (readOnly ? "RO Memory" : "RW Memory"));
+        super(startAddress, endAddress, (readOnly ? "RO Memory" : "RW Memory"));
         this.readOnly = readOnly;
-        this.mem = new int[size];
+        this.mem = new int[endAddress - startAddress + 1];
         this.fill(DEFAULT_FILL);
     }
 
-    public Memory(int address, int size) throws MemoryRangeException {
-        this(address, size, false);
+    public Memory(int startAddress, int endAddress) throws MemoryRangeException {
+        this(startAddress, endAddress, false);
     }
 
-    public static Memory makeROM(int address, int size, File f) throws MemoryRangeException, IOException {
-        Memory memory = new Memory(address, size, true);
+    public static Memory makeROM(int startAddress, int endAddress, File f) throws MemoryRangeException, IOException {
+        Memory memory = new Memory(startAddress, endAddress, true);
         memory.loadFromFile(f);
         return memory;
     }
 
-    public static Memory makeRAM(int address, int size) throws MemoryRangeException {
-        Memory memory = new Memory(address, size, false);
+    public static Memory makeRAM(int startAddress, int endAddress) throws MemoryRangeException {
+        Memory memory = new Memory(startAddress, endAddress, false);
         return memory;
     }
 
@@ -109,4 +109,4 @@ public class Memory extends Device {
         return "Memory: " + getMemoryRange().toString();
     }
 
-}
+}

src/main/java/com/loomcom/symon/devices/Via.java

@@ -47,7 +47,7 @@ public class Via extends Device {
     private static final int ORA_H = 15;
 
     public Via(int address) throws MemoryRangeException {
-      super(address, VIA_SIZE, "VIA");
+      super(address, address + VIA_SIZE - 1, "VIA");
     }
 
     @Override