Can somewhat load from audio

Core/Io/IO_Bus.cs

@@ -19,7 +19,7 @@ namespace Core.Io
         public byte ReadPort(ushort portAddress)
         {
             // The Spectrum ULA responds to any even port address (where the lowest bit is 0)
-            if ((portAddress & 0x01) == 0)
+            if ((portAddress & 0x01) == 0) //Port 0xFE)
             {
                 byte highByte = (byte)(portAddress >> 8); // The B register!
                 byte result = 0xFF; // Start assuming no keys are pressed
@@ -40,11 +40,17 @@ namespace Core.Io
 
                 //return result;
                 // The top 3 bits (5, 6, 7) are unused by the keyboard and usually return 1 on a real Spectrum
-                return (byte)(result | 0xE0);
+                return (byte)(result | 0xA0);
+            }
+
+            // Kempston Joystick Port
+            if ((portAddress & 0xFF) == 0x1F)
+            {
+                return 0x00; // 0x00 means no joystick connected/no buttons pressed
             }
 
             // Return 0xFF for unhandled ports
-            return 0xFF;
+            return 0x00;
         }
 
         public void WritePort(ushort portAddress, byte portValue)