Rename VIA to PIA

Preparing to create a PIA interface and one or more parallel
IO device implementations.

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

@@ -26,8 +26,8 @@ package com.loomcom.symon.devices;
 import com.loomcom.symon.exceptions.MemoryAccessException;
 import com.loomcom.symon.exceptions.MemoryRangeException;
 
-public class Via extends Device {
+public class Pia extends Device {
-    public static final int VIA_SIZE = 16;
+    public static final int PIA_SIZE = 16;
 
     private static final int ORB = 0;
     private static final int ORA = 1;
@@ -46,13 +46,13 @@ public class Via extends Device {
     private static final int IER = 14;
     private static final int ORA_H = 15;
 
-    public Via(int address) throws MemoryRangeException {
+    public Pia(int address) throws MemoryRangeException {
-      super(address, address + VIA_SIZE - 1, "VIA");
+      super(address, address + PIA_SIZE - 1, "PIA");
     }
 
     @Override
     public void write(int address, int data) throws MemoryAccessException {
-
+        ; // No-Op
     }
 
     @Override

src/main/java/com/loomcom/symon/machines/Machine.java

@@ -29,7 +29,7 @@ import com.loomcom.symon.Cpu;
 import com.loomcom.symon.devices.Acia;
 import com.loomcom.symon.devices.Crtc;
 import com.loomcom.symon.devices.Memory;
-import com.loomcom.symon.devices.Via;
+import com.loomcom.symon.devices.Pia;
 import com.loomcom.symon.exceptions.MemoryRangeException;
 
 
@@ -43,7 +43,7 @@ public interface Machine {
     
     public Acia getAcia();
     
-    public Via getVia();
+    public Pia getPia();
     
     public Crtc getCrtc();
     

src/main/java/com/loomcom/symon/machines/MulticompMachine.java

@@ -30,7 +30,7 @@ import com.loomcom.symon.devices.Acia;
 import com.loomcom.symon.devices.Acia6850;
 import com.loomcom.symon.devices.Crtc;
 import com.loomcom.symon.devices.Memory;
-import com.loomcom.symon.devices.Via;
+import com.loomcom.symon.devices.Pia;
 import com.loomcom.symon.exceptions.MemoryRangeException;
 import java.io.File;
 import java.util.logging.Logger;
@@ -111,7 +111,7 @@ public class MulticompMachine implements Machine {
     }
 
     @Override
-    public Via getVia() {
+    public Pia getPia() {
         return null;
     }
 

src/main/java/com/loomcom/symon/machines/SimpleMachine.java

@@ -5,7 +5,7 @@ import com.loomcom.symon.Cpu;
 import com.loomcom.symon.devices.Acia;
 import com.loomcom.symon.devices.Crtc;
 import com.loomcom.symon.devices.Memory;
-import com.loomcom.symon.devices.Via;
+import com.loomcom.symon.devices.Pia;
 import com.loomcom.symon.exceptions.MemoryRangeException;
 
 /**
@@ -52,7 +52,7 @@ public class SimpleMachine implements Machine {
     }
 
     @Override
-    public Via getVia() {
+    public Pia getPia() {
         return null;
     }
 

src/main/java/com/loomcom/symon/machines/SymonMachine.java

@@ -30,7 +30,7 @@ import com.loomcom.symon.devices.Acia;
 import com.loomcom.symon.devices.Acia6551;
 import com.loomcom.symon.devices.Crtc;
 import com.loomcom.symon.devices.Memory;
-import com.loomcom.symon.devices.Via;
+import com.loomcom.symon.devices.Pia;
 import com.loomcom.symon.exceptions.MemoryRangeException;
 import java.io.File;
 import java.util.logging.Logger;
@@ -48,9 +48,9 @@ public class SymonMachine implements Machine {
     private static final int MEMORY_BASE = 0x0000;
     private static final int MEMORY_SIZE = 0x8000;
 
-    // VIA at $8000-$800F
+    // PIA at $8000-$800F
 
-    private static final int VIA_BASE = 0x8000;
+    private static final int PIA_BASE = 0x8000;
 
     // ACIA at $8800-$8803
     private static final int ACIA_BASE = 0x8800;
@@ -68,7 +68,7 @@ public class SymonMachine implements Machine {
     private final Bus    bus;
     private final Cpu    cpu;
     private final Acia   acia;
-    private final Via    via;
+    private final Pia    pia;
     private final Crtc   crtc;
     private final Memory ram;
     private       Memory rom;
@@ -78,13 +78,13 @@ public class SymonMachine implements Machine {
         this.bus = new Bus(BUS_BOTTOM, BUS_TOP);
         this.cpu = new Cpu();
         this.ram = new Memory(MEMORY_BASE, MEMORY_BASE + MEMORY_SIZE - 1, false);
-        this.via = new Via(VIA_BASE);
+        this.pia = new Pia(PIA_BASE);
         this.acia = new Acia6551(ACIA_BASE);
         this.crtc = new Crtc(CRTC_BASE, ram);
 
         bus.addCpu(cpu);
         bus.addDevice(ram);
-        bus.addDevice(via);
+        bus.addDevice(pia);
         bus.addDevice(acia);
         bus.addDevice(crtc);
         
@@ -124,8 +124,8 @@ public class SymonMachine implements Machine {
     }
 
     @Override
-    public Via getVia() {
+    public Pia getPia() {
-        return via;
+        return pia;
     }
 
     @Override