diff --git a/src/wpilibsharp/Simulation/AddressableLEDSim.cs b/src/wpilibsharp/Simulation/AddressableLEDSim.cs
new file mode 100644
index 00000000..6613251c
--- /dev/null
+++ b/src/wpilibsharp/Simulation/AddressableLEDSim.cs
@@ -0,0 +1,19 @@
+using WPIHal;
+using WPIHal.Natives.Simulation;
+
+namespace WPILib.Simulation;
+
+public class AddressableLEDSim
+{
+    private readonly int m_index;
+
+    public AddressableLEDSim()
+    {
+        m_index = 0;
+    }
+
+    public unsafe CallbackStore registerInitializedCallback(Action<string, HalValue> callback, bool initialNotify)
+    {
+        return new CallbackStore(callback, m_index, initialNotify, &HalAddressableLEDData.RegisterAddressableLEDInitializedCallback, &HalAddressableLEDData.CancelAddressableLEDInitializedCallback);
+    }
+}
diff --git a/src/wpilibsharp/Simulation/CallbackStore.cs b/src/wpilibsharp/Simulation/CallbackStore.cs
new file mode 100644
index 00000000..0667ef16
--- /dev/null
+++ b/src/wpilibsharp/Simulation/CallbackStore.cs
@@ -0,0 +1,60 @@
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using WPIHal;
+using unsafe HalGlobalCreate = delegate* managed<delegate* unmanaged[Cdecl]<byte*, void*, WPIHal.HalValue*, void>, void*, bool, int>;
+using unsafe HalGlobalFree = delegate* managed<int, void>;
+using unsafe HalIndexedCreate = delegate* managed<int, delegate* unmanaged[Cdecl]<byte*, void*, WPIHal.HalValue*, void>, void*, bool, int>;
+using unsafe HalIndexedFree = delegate* managed<int, int, void>;
+using unsafe HalNativeNotifyCallback = delegate* unmanaged[Cdecl]<byte*, void*, WPIHal.HalValue*, void>;
+
+namespace WPILib.Simulation;
+
+public class CallbackStore : IDisposable
+{
+    private GCHandle delegateHandle;
+    private readonly int nativeHandle;
+    private readonly int? index;
+    private unsafe readonly HalIndexedFree indexedFree;
+    private unsafe readonly HalGlobalFree globalFree;
+
+    [UnmanagedCallersOnly(CallConvs = [typeof(CallConvCdecl)])]
+    public static unsafe void HalNotifyCallback(byte* name, void* param, HalValue* value)
+    {
+        GCHandle handle = GCHandle.FromIntPtr((nint)param);
+        if (handle.Target is Action<string, HalValue> stringCallback)
+        {
+            string n = Marshal.PtrToStringUTF8((nint)name) ?? "";
+            stringCallback(n, *value);
+        }
+    }
+
+    public unsafe void Dispose()
+    {
+        GC.SuppressFinalize(this);
+        if (index is { } x)
+        {
+            indexedFree(x, nativeHandle);
+        }
+        else
+        {
+            globalFree(nativeHandle);
+        }
+        delegateHandle.Free();
+    }
+
+    public unsafe CallbackStore(Action<string, HalValue> callback, bool immediateNotify, HalGlobalCreate create, HalGlobalFree free)
+    {
+        delegateHandle = GCHandle.Alloc(callback);
+        nativeHandle = create(&HalNotifyCallback, (void*)(nint)delegateHandle, immediateNotify);
+        index = null;
+        globalFree = free;
+    }
+
+    public unsafe CallbackStore(Action<string, HalValue> callback, int index, bool immediateNotify, HalIndexedCreate create, HalIndexedFree free)
+    {
+        delegateHandle = GCHandle.Alloc(callback);
+        nativeHandle = create(index, &HalNotifyCallback, (void*)(nint)delegateHandle, immediateNotify);
+        this.index = index;
+        indexedFree = free;
+    }
+}