diff --git a/EightBit/PortEventArgs.cs b/EightBit/PortEventArgs.cs
index 85e0e43..75026c0 100644
--- a/EightBit/PortEventArgs.cs
+++ b/EightBit/PortEventArgs.cs
@@ -6,11 +6,8 @@ namespace EightBit
     {
         private byte port;
 
-        public PortEventArgs(byte value)
-        {
-            port = value;
-        }
+        public PortEventArgs(byte value) => port = value;
 
-        public byte Port { get { return port; } }
+        public byte Port => port;
     }
 }
diff --git a/EightBit/Processor.cs b/EightBit/Processor.cs
index 048fd48..363a1bb 100644
--- a/EightBit/Processor.cs
+++ b/EightBit/Processor.cs
@@ -4,9 +4,9 @@
 
     public abstract class Processor : ClockedChip
     {
-        private Bus bus;
+        private readonly Bus bus;
         private byte opcode;
-        private ushort pc;
+        private ushort pc = 0;
 
         private PinLevel resetLine;
         private PinLevel intLine;
@@ -14,7 +14,6 @@
         protected Processor(Bus memory)
         {
             bus = memory;
-            pc = 0;
         }
 
         public event EventHandler<EventArgs> RaisingRESET;
@@ -29,7 +28,7 @@
 
         public ushort PC { get => pc; set => pc = value; }
         protected byte OpCode { get => opcode; set => opcode = value; }
-        public Bus Bus { get => bus; set => bus = value; }
+        public Bus Bus { get => bus; }
 
         public ref PinLevel RESET() => ref resetLine;
         public ref PinLevel INT() => ref intLine;
diff --git a/EightBit/Rom.cs b/EightBit/Rom.cs
index 5ee1a47..4148344 100644
--- a/EightBit/Rom.cs
+++ b/EightBit/Rom.cs
@@ -11,9 +11,9 @@
 
         public Rom() : this(0) { }
 
-        public override int Size { get { return bytes.Length; } }
+        public override int Size => bytes.Length;
 
-        protected ref byte[] Bytes() { return ref bytes; }
+        protected ref byte[] Bytes() => ref bytes;
 
         static public int Load(FileStream file, ref byte[] output, int writeOffset = 0, int readOffset = 0, int limit = -1, int maximumSize = -1)
         {