Added control pad to Kempston interface

Desktop/Form1.cs

@@ -1,7 +1,7 @@
-using Core; // <-- This gives us access to SpectrumMachine
+using Core;
 using Core.Io;
-using System.Diagnostics;
 using System.Drawing.Imaging;
+using Vortice.XInput;
 using System.Reflection;
 using System.Runtime.InteropServices;
 
@@ -17,12 +17,6 @@ namespace Desktop
         private Bitmap _screenBitmap = null!;
         private string _baseTitle = "";
 
-        // ====================================================================
-        // DEBUGGER PASS-THROUGHS
-        // ====================================================================
-        // The DebuggerForm still looks at Form1 for data. These properties act 
-        // as a bridge, instantly passing the request down to the actual engine!
-
         public ushort? Breakpoint
         {
             get => _machine?.Breakpoint;
@@ -84,11 +78,12 @@ namespace Desktop
 
         private void Machine_OnFrameReady(int[] pixels)
         {
-            // We must use BeginInvoke because the Machine is running on a background thread!
+            PollGamepad();
+
             this.BeginInvoke((System.Windows.Forms.MethodInvoker)delegate
             {
                 UpdateScreenBitmap(pixels);
-                this.Invalidate(); // Triggers OnPaint
+                this.Invalidate();
             });
         }
 
@@ -384,6 +379,35 @@ namespace Desktop
             _machine.Resume();
         }
 
-        
+        //Control pad method       
+
+        private void PollGamepad()
+        {
+            // Only check Player 1 (Index 0)
+            if (XInput.GetState(0, out State state))
+            {
+                byte kempston = 0x00;
+                Gamepad gamepad = state.Gamepad;
+
+                // Map D-Pad to Kempston Bits
+                if ((gamepad.Buttons & GamepadButtons.DPadRight) != 0) kempston |= 0x01; // Bit 0
+                if ((gamepad.Buttons & GamepadButtons.DPadLeft) != 0) kempston |= 0x02; // Bit 1
+                if ((gamepad.Buttons & GamepadButtons.DPadDown) != 0) kempston |= 0x04; // Bit 2
+                if ((gamepad.Buttons & GamepadButtons.DPadUp) != 0) kempston |= 0x08; // Bit 3
+
+                // Map A Button (or whichever you prefer) to Fire
+                if ((gamepad.Buttons & GamepadButtons.A) != 0) kempston |= 0x10; // Bit 4
+
+                // Send the final byte down to the emulator core!
+                _machine.IoBus.KempstonState = kempston;
+            }
+            else
+            {
+                // Controller disconnected, zero it out
+                _machine.IoBus.KempstonState = 0x00;
+            }
+        }
+
+
     }
 }