diff --git a/EightBit/IMemory.cs b/EightBit/IMemory.cs
new file mode 100644
index 0000000..92eac32
--- /dev/null
+++ b/EightBit/IMemory.cs
@@ -0,0 +1,26 @@
+// <copyright file="Memory.cs" company="Adrian Conlon">
+// Copyright (c) Adrian Conlon. All rights reserved.
+// </copyright>
+
+namespace EightBit
+{
+    public interface IMemory
+    {
+        abstract int Size
+        {
+            get;
+        }
+
+        byte Peek(ushort address);
+
+        void Poke(ushort address, byte value);
+
+        ref byte Reference(ushort address);
+
+        int Load(FileStream file, int writeOffset = 0, int readOffset = 0, int limit = -1);
+
+        int Load(string path, int writeOffset = 0, int readOffset = 0, int limit = -1);
+
+        int Load(byte[] from, int writeOffset = 0, int readOffset = 0, int limit = -1);
+    }
+}
diff --git a/EightBit/Memory.cs b/EightBit/Memory.cs
deleted file mode 100644
index 30c32ee..0000000
--- a/EightBit/Memory.cs
+++ /dev/null
@@ -1,26 +0,0 @@
-// <copyright file="Memory.cs" company="Adrian Conlon">
-// Copyright (c) Adrian Conlon. All rights reserved.
-// </copyright>
-
-namespace EightBit
-{
-    public abstract class Memory
-    {
-        public abstract int Size
-        {
-            get;
-        }
-
-        public abstract byte Peek(ushort address);
-
-        public virtual ref byte Reference(ushort address) => throw new NotImplementedException();
-
-        public abstract int Load(FileStream file, int writeOffset = 0, int readOffset = 0, int limit = -1);
-
-        public abstract int Load(string path, int writeOffset = 0, int readOffset = 0, int limit = -1);
-
-        public abstract int Load(byte[] from, int writeOffset = 0, int readOffset = 0, int limit = -1);
-
-        protected abstract void Poke(ushort address, byte value);
-    }
-}
diff --git a/EightBit/MemoryMapping.cs b/EightBit/MemoryMapping.cs
index 92931d6..85f94cd 100644
--- a/EightBit/MemoryMapping.cs
+++ b/EightBit/MemoryMapping.cs
@@ -6,7 +6,7 @@ namespace EightBit
 {
     public sealed class MemoryMapping
     {
-        public MemoryMapping(Memory memory, ushort begin, ushort mask, AccessLevel access)
+        public MemoryMapping(IMemory memory, ushort begin, ushort mask, AccessLevel access)
         {
             this._memory = memory;
             this._begin = begin;
@@ -20,18 +20,18 @@ namespace EightBit
             }
         }
 
-        public MemoryMapping(Memory memory, ushort begin, Mask mask, AccessLevel access)
+        public MemoryMapping(IMemory memory, ushort begin, Mask mask, AccessLevel access)
         : this(memory, begin, (ushort)mask, access)
         {
         }
 
         private readonly ushort[] _offsets = new ushort[ushort.MaxValue + 1];
-        private readonly Memory _memory;
+        private readonly IMemory _memory;
         private readonly ushort _begin;
         private readonly ushort _mask;
         private readonly AccessLevel _access;
 
-        public Memory Memory => this._memory;
+        public IMemory Memory => this._memory;
 
         public ushort Begin => this._begin;
 
diff --git a/EightBit/Ram.cs b/EightBit/Ram.cs
index 2b4e7a5..1d3b9ca 100644
--- a/EightBit/Ram.cs
+++ b/EightBit/Ram.cs
@@ -12,7 +12,5 @@ namespace EightBit
         }
 
         public sealed override ref byte Reference(ushort address) => ref this.Bytes()[address];
-
-        public new void Poke(ushort address, byte value) => base.Poke(address, value);
     }
 }
diff --git a/EightBit/Rom.cs b/EightBit/Rom.cs
index 097a21a..7fec674 100644
--- a/EightBit/Rom.cs
+++ b/EightBit/Rom.cs
@@ -6,11 +6,11 @@ namespace EightBit
 {
     using System.Diagnostics;
 
-    public class Rom(int size = 0) : Memory
+    public class Rom(int size = 0) : IMemory
     {
         private byte[] _bytes = new byte[size];
 
-        public override int Size => this._bytes.Length;
+        public int Size => this._bytes.Length;
 
         public static int Load(Stream file, ref byte[] output, int writeOffset = 0, int readOffset = 0, int limit = -1, int maximumSize = -1)
         {
@@ -54,19 +54,19 @@ namespace EightBit
             return Load(file, ref output, writeOffset, readOffset, limit, maximumSize);
         }
 
-        public override int Load(FileStream file, int writeOffset = 0, int readOffset = 0, int limit = -1)
+        public int Load(FileStream file, int writeOffset = 0, int readOffset = 0, int limit = -1)
         {
             var maximumSize = this.Size - writeOffset;
             return Load(file, ref this.Bytes(), writeOffset, readOffset, limit, maximumSize);
         }
 
-        public override int Load(string path, int writeOffset = 0, int readOffset = 0, int limit = -1)
+        public int Load(string path, int writeOffset = 0, int readOffset = 0, int limit = -1)
         {
             var maximumSize = this.Size - writeOffset;
             return Load(path, ref this.Bytes(), writeOffset, readOffset, limit, maximumSize);
         }
 
-        public override int Load(byte[] from, int writeOffset = 0, int readOffset = 0, int limit = -1)
+        public int Load(byte[] from, int writeOffset = 0, int readOffset = 0, int limit = -1)
         {
             ArgumentNullException.ThrowIfNull(from);
 
@@ -88,10 +88,12 @@ namespace EightBit
             return limit;
         }
 
-        public override byte Peek(ushort address) => this.Bytes()[address];
+        public byte Peek(ushort address) => this.Bytes()[address];
+
+        public void Poke(ushort address, byte value) => this.Bytes()[address] = value;
+
+        public virtual ref byte Reference(ushort address) => throw new NotImplementedException();
 
         protected ref byte[] Bytes() => ref this._bytes;
-
-        protected override void Poke(ushort address, byte value) => this.Bytes()[address] = value;
     }
 }
diff --git a/EightBit/UnusedMemory.cs b/EightBit/UnusedMemory.cs
index 04e2c19..d00dccf 100644
--- a/EightBit/UnusedMemory.cs
+++ b/EightBit/UnusedMemory.cs
@@ -4,21 +4,23 @@
 
 namespace EightBit
 {
-    public class UnusedMemory(int size, byte unchanging) : Memory
+    public class UnusedMemory(int size, byte unchanging) : IMemory
     {
         private readonly int _size = size;
         private readonly byte _unchanging = unchanging;
 
-        public override int Size => this._size;
+        public int Size => this._size;
 
-        public override int Load(FileStream file, int writeOffset = 0, int readOffset = 0, int limit = -1) => throw new NotImplementedException();
+        public int Load(FileStream file, int writeOffset = 0, int readOffset = 0, int limit = -1) => throw new NotImplementedException();
 
-        public override int Load(string path, int writeOffset = 0, int readOffset = 0, int limit = -1) => throw new NotImplementedException();
+        public int Load(string path, int writeOffset = 0, int readOffset = 0, int limit = -1) => throw new NotImplementedException();
 
-        public override int Load(byte[] from, int writeOffset = 0, int readOffset = 0, int limit = -1) => throw new NotImplementedException();
+        public int Load(byte[] from, int writeOffset = 0, int readOffset = 0, int limit = -1) => throw new NotImplementedException();
 
-        public override byte Peek(ushort address) => this._unchanging;
+        public byte Peek(ushort address) => this._unchanging;
 
-        protected override void Poke(ushort address, byte value) => throw new NotImplementedException();
+        public void Poke(ushort address, byte value) => throw new NotImplementedException();
+
+        public ref byte Reference(ushort address) => throw new NotImplementedException();
     }
 }