diff --git a/SMILEBASIC/VM.d b/SMILEBASIC/VM.d
index 6d0b255..4c03b81 100644
--- a/SMILEBASIC/VM.d
+++ b/SMILEBASIC/VM.d
@@ -85,6 +85,22 @@ struct Callback
             return !func.isDead;
         return false;
     }
+    void opCall(VM vm)
+    {
+        if (!isCallable)
+            return;
+        if (type == CallbackType.label)
+        {
+            vm.pushBackTrace("");
+            vm.pushpc;
+            vm.setCurrentSlot(slot.index);
+            vm.pc = label - 1;
+        }
+        if (type == CallbackType.function_)
+        {
+            vm.call(func, 0, 0);
+        }
+    }
 }
 
 class VM
@@ -501,6 +517,42 @@ class VM
         result.label = label;
         return result;
     }
+    void call(Function func, int argCount, int outArgCount)
+    {
+        alias vm = this;
+        if(func.argCount != argCount)
+        {
+            throw new IllegalFunctionCall(func.name.to!string);
+        }
+        if(func.outArgCount != outArgCount)
+        {
+            throw new IllegalFunctionCall(func.name.to!string);
+        }
+        vm.pushBackTrace(func.name);
+        //TODO:args
+        auto bp = vm.stacki;
+        vm.push(Value(vm.currentFunction));
+        vm.currentFunction = func;
+        vm.push(Value(vm.currentData));
+        vm.currentData.index = 0;
+        vm.currentData.table = func.scope_.data;
+        vm.push(Value(vm.bp));
+        vm.pushpc;//vm.push(Value(vm.pc));
+        vm.bp = bp;
+        vm.pc = func.address - 1;
+        vm.stacki += func.variableIndex - 1;
+        foreach(wstring k, VMVariable v ; func.variable)
+        {
+            if(v.index > 0)
+            {
+                vm.stack[bp + v.index] = Value(v.type);
+            }
+        }
+        if (func.isCommon)
+        {
+            vm.setCurrentSlot(func.slot.index);
+        }
+    }
 }
 enum CodeType
 {
@@ -1612,38 +1664,7 @@ class CallFunctionCode : Code
         {
             resolve(vm);
         }
-        if(func.argCount != this.argCount)
-        {
-            throw new IllegalFunctionCall(name.to!string);
-        }
-        if(func.outArgCount != this.outArgCount)
-        {
-            throw new IllegalFunctionCall(name.to!string);
-        }
-        vm.pushBackTrace(name);
-        //TODO:args
-        auto bp = vm.stacki;
-        vm.push(Value(vm.currentFunction));
-        vm.currentFunction = func;
-        vm.push(Value(vm.currentData));
-        vm.currentData.index = 0;
-        vm.currentData.table = func.scope_.data;
-        vm.push(Value(vm.bp));
-        vm.pushpc;//vm.push(Value(vm.pc));
-        vm.bp = bp;
-        vm.pc = func.address - 1;
-        vm.stacki += func.variableIndex - 1;
-        foreach(wstring k, VMVariable v ; func.variable)
-        {
-            if(v.index > 0)
-            {
-                vm.stack[bp + v.index] = Value(v.type);
-            }
-        }
-        if (func.isCommon)
-        {
-            vm.setCurrentSlot(func.slot.index);
-        }
+        vm.call(func, this.argCount, this.outArgCount);
     }
     override string toString(VM vm)
     {
@@ -1690,34 +1711,7 @@ class CallFunctionS : Code
     }
     void callFunc(Function func, VM vm)
     {
-        if(func.argCount != this.argCount)
-        {
-            throw new IllegalFunctionCall(func.name.to!string);
-        }
-        if(func.outArgCount != this.outArgCount)
-        {
-            throw new IllegalFunctionCall(func.name.to!string);
-        }
-        //TODO:args
-        auto bp = vm.stacki;
-        vm.push(Value(vm.currentFunction));
-        vm.currentFunction = func;
-        vm.push(Value(vm.currentData));
-        vm.currentData.index = 0;
-        vm.currentData.table = func.scope_.data;
-        vm.push(Value(vm.bp));
-        vm.pushpc;
-        vm.bp = bp;
-        vm.pc = func.address - 1;
-        vm.stacki += func.variableIndex - 1;
-        foreach(wstring k, VMVariable v ; func.variable)
-        {
-            if(v.index > 0)
-            {
-                vm.stack[bp + v.index] = Value(v.type);
-            }
-        }
-        vm.setCurrentSlot(func.slot.index);
+        vm.call(func, argCount, outArgCount);
     }
     override void execute(VM vm)
     {
@@ -1759,7 +1753,6 @@ class CallFunctionS : Code
             callBuintinFunc(bfunc, vm);
             return;
         }
-        vm.pushBackTrace(name.name);
         callFunc(func, vm);
     }
     override string toString(VM vm)
@@ -2683,3 +2676,70 @@ class ConvertBool : Code
         top.type = ValueType.Integer;
     }
 }
+
+/+
+SPFUNC 0,@A
+FOR I=1TO 511
+SPFUNC I,@B
+NEXT
+CALL SPRITE
+END
+@A
+?"BEFORE CALL BG",CALLIDX
+CALL BG
+?"AFTER CALL BG",CALLIDX
+RETUERN
+@B
+?CALLIDX
+RETURN
+
+RESULT
+BEFORE CALL BG  0
+AFTER CALL BG   4
+=>SPFUNC 1~511 is not called
++/
+class InitCallback : Code
+{
+    override void execute(VM vm)
+    {
+        vm.petitcomputer.callidx = -1;
+        vm.petitcomputer.callback = true;
+    }
+}
+
+class CallSprite : Code
+{
+    override void execute(VM vm)
+    {
+        vm.petitcomputer.callidx++;
+        if (!vm.petitcomputer.callback)
+        {
+            return;
+        }
+        if (!vm.petitcomputer.sprite.isValidSpriteId(vm.petitcomputer.callidx))
+        {
+            vm.petitcomputer.callback = false;
+            return;
+        }
+        auto callback = vm.petitcomputer.sprite.getCallback(vm.petitcomputer.callidx);
+        vm.pc--;
+        if (!callback.isCallable)
+        {
+            return;
+        }
+        callback(vm);
+    }
+}
+
+class CallBG : Code
+{
+    override void execute(VM vm)
+    {
+        if (!vm.petitcomputer.callback)
+        {
+            vm.petitcomputer.callidx++;
+            return;
+        }
+        vm.petitcomputer.callidx++;
+    }
+}
diff --git a/SMILEBASIC/compiler.d b/SMILEBASIC/compiler.d
index d6ac11a..d1c849e 100644
--- a/SMILEBASIC/compiler.d
+++ b/SMILEBASIC/compiler.d
@@ -227,6 +227,7 @@ class Compiler
         addSystemVariable("HARDWARE", new Hardware());
         addSystemVariable("MILLISEC", new MilliSecond());
         addSystemVariable("PRGSLOT", new ProgramSlot());
+        addSystemVariable("CALLIDX", new CallIndex());
     }
     void addSystemVariable(wstring name, SystemVariable var)
     {
@@ -970,6 +971,16 @@ class Compiler
         genCode(new otya.smilebasic.vm.Linput);
         compilePopVar(linput.expression, sc);
     }
+    void compileCallSprite(otya.smilebasic.node.CallSprite call, Scope sc)
+    {
+        genCode(new InitCallback);
+        genCode(new otya.smilebasic.vm.CallSprite);
+    }
+    void compileCallBG(otya.smilebasic.node.CallBG call, Scope sc)
+    {
+        genCode(new InitCallback);
+        genCode(new otya.smilebasic.vm.CallBG);
+    }
     void compileStatement(Statement i, Scope s)
     {
         switch(i.type)
@@ -1247,6 +1258,12 @@ class Compiler
             case NodeType.Linput:
                 compileLinput(cast(otya.smilebasic.node.Linput)i, s);
                 break;
+            case NodeType.CallSprite:
+                compileCallSprite(cast(otya.smilebasic.node.CallSprite)i, s);
+                break;
+            case NodeType.CallBG:
+                compileCallBG(cast(otya.smilebasic.node.CallBG)i, s);
+                break;
             default:
                 stderr.writeln("Compile:NotImpl ", i.type);
         }
diff --git a/SMILEBASIC/node.d b/SMILEBASIC/node.d
index fe2b460..57e6306 100644
--- a/SMILEBASIC/node.d
+++ b/SMILEBASIC/node.d
@@ -51,6 +51,8 @@ enum NodeType
     Exec,
     Use,
     Linput,
+    CallSprite,
+    CallBG,
 }
 abstract class Node
 {
@@ -697,3 +699,19 @@ class Linput : Statement
         this.expression = expr;
     }
 }
+class CallSprite : Statement
+{
+    this(SourceLocation loc)
+    {
+        super.location = loc;
+        this.type = NodeType.CallSprite;
+    }
+}
+class CallBG : Statement
+{
+    this(SourceLocation loc)
+    {
+        super.location = loc;
+        this.type = NodeType.CallBG;
+    }
+}
diff --git a/SMILEBASIC/parser.d b/SMILEBASIC/parser.d
index 4ef2759..e286e6f 100644
--- a/SMILEBASIC/parser.d
+++ b/SMILEBASIC/parser.d
@@ -939,6 +939,23 @@ class Parser
                         }
                     }
                     lex.popFront();
+                    if (token.type == TokenType.Call)
+                    {
+                        if (lex.front.type == TokenType.Iden)
+                        {
+                            auto arg = std.uni.toUpper(lex.front.value.castString);
+                            if (arg == "SPRITE")
+                            {
+                                node = new CallSprite(lex.location);
+                                break;
+                            }
+                            if (arg == "BG")
+                            {
+                                node = new CallBG(lex.location);
+                                break;
+                            }
+                        }
+                    }
                     //命令呼び出し
                     auto func = new CallFunctionStatement(name, lex.location);
                     node = func;
diff --git a/SMILEBASIC/petitcomputer.d b/SMILEBASIC/petitcomputer.d
index b66496e..616e157 100644
--- a/SMILEBASIC/petitcomputer.d
+++ b/SMILEBASIC/petitcomputer.d
@@ -1695,6 +1695,9 @@ class PetitComputer
         SDL_SetClipboardText(ws.to!string.toStringz);
     }
 
+    bool callback;
+    int callidx = 0;
+
     //プチコン内部表現はRGB5_A1
     static uint toGLColor(GLenum format, ubyte r, ubyte g, ubyte b, ubyte a)
     {
diff --git a/SMILEBASIC/sprite.d b/SMILEBASIC/sprite.d
index 629cf4d..b93c316 100644
--- a/SMILEBASIC/sprite.d
+++ b/SMILEBASIC/sprite.d
@@ -1191,4 +1191,8 @@ class Sprite
         id = spid(id);
         sprites[id].callback = callback;
     }
+    Callback getCallback(int id)
+    {
+        return sprites[spid(id)].callback;
+    }
 }
diff --git a/SMILEBASIC/systemvariable.d b/SMILEBASIC/systemvariable.d
index 7159014..2064771 100644
--- a/SMILEBASIC/systemvariable.d
+++ b/SMILEBASIC/systemvariable.d
@@ -10,6 +10,9 @@ class SystemVariable
     @property
         void value(Value value)
         {
+            //v3.3.2
+            //TIME$=1,TIME$="1"=>Type mismatch(runtime)
+            //MAINCNT=1,MAINCNT="1"=>Syntax error(runtime)
             throw new TypeMismatch();
         }
 }
@@ -139,3 +142,10 @@ class ProgramSlot : SystemVariable
             return Value(vm.petitcomputer.program.currentSlot);
         }
 }
+class CallIndex : SystemVariable
+{
+    @property override Value value()
+    {
+        return Value(vm.petitcomputer.callidx);
+    }
+}