diff --git a/SMILEBASIC/node.d b/SMILEBASIC/node.d
index 84f628c..54ab14d 100644
--- a/SMILEBASIC/node.d
+++ b/SMILEBASIC/node.d
@@ -46,6 +46,8 @@ enum NodeType
     Swap,
     AssignRef,
     VarRef,
+    XOn,
+    XOff,
 }
 abstract class Node
 {
@@ -631,3 +633,24 @@ class VarRef : Expression
         this.expression = expr;
     }
 }
+class XOn : Statement
+{
+    wstring func;
+    this(wstring func, SourceLocation loc)
+    {
+        super.location = loc;
+        this.type = NodeType.XOn;
+        this.func = func;
+    }
+}
+class XOff : Statement
+{
+    wstring func;
+    this(wstring func, SourceLocation loc)
+    {
+        super.location = loc;
+        this.type = NodeType.XOff;
+        this.func = func;
+    }
+}
+
diff --git a/SMILEBASIC/parser.d b/SMILEBASIC/parser.d
index 4d56aca..3e1eb35 100644
--- a/SMILEBASIC/parser.d
+++ b/SMILEBASIC/parser.d
@@ -864,8 +864,11 @@ class Parser
             case TokenType.Iden:
                 {
                     wstring name = token.value.stringValue;
-                    if (name == "OPTION")
+                    auto uname = std.uni.toUpper(name);
+                    if (uname == "OPTION")
                     {
+                        lex.popFront;
+                        token = lex.front;
                         if (token.type != TokenType.Iden)
                         {
                             syntaxError();
@@ -880,6 +883,24 @@ class Parser
                         lex.popFront();
                         return new Option(arg, lex.location);
                     }
+                    if (uname == "XON" || uname == "XOFF")
+                    {
+                        lex.popFront;
+                        token = lex.front;
+                        if (token.type != TokenType.Iden)
+                        {
+                            syntaxError();
+                            return null;
+                        }
+                        auto arg = std.uni.toUpper(token.value.stringValue);
+                        if (arg != "MOTION" && arg != "EXPAD" && arg != "MIC" && arg != "WIIU")
+                        {
+                            syntaxError();
+                            return null;
+                        }
+                        lex.popFront();
+                        return uname == "XON" ? new XOn(arg, lex.location) : new XOff(arg, lex.location);
+                    }
                     if (token.type != TokenType.Call)
                     {
                         auto old = lex.save;