diff --git a/SMILEBASIC/bg.d b/SMILEBASIC/bg.d
index 83b5aeb..5b61ad6 100644
--- a/SMILEBASIC/bg.d
+++ b/SMILEBASIC/bg.d
@@ -135,6 +135,15 @@ class BG
     }
     void screen(int w, int h)
     {
+        rot = 0;
+        scalex = 0;
+        scaley = 0;
+        homex = 0;
+        homey = 0;
+        chipWidth = 16;
+        chipHeight = 16;
+        offsetx = offsety = offsetz = 0;
+        //BGCLIP is not initialized
         this.width = w;
         this.height = h;
         this.clear();
diff --git a/SMILEBASIC/builtinfunctions.d b/SMILEBASIC/builtinfunctions.d
index acc5953..abfde85 100644
--- a/SMILEBASIC/builtinfunctions.d
+++ b/SMILEBASIC/builtinfunctions.d
@@ -2465,10 +2465,11 @@ class BuiltinFunction
     }
     static void ACLS(PetitComputer p)
     {
-        p.console.cls;
-        SPCLR(p, DefaultValue!(int, false)(true));
-        BGCLR(p, DefaultValue!(int, false)(true));
-        GCLS(p);
+        p.acls(true, true, true);
+    }
+    static void ACLS(PetitComputer p, int gr, int sp, int fn)
+    {
+        p.acls(cast(bool)gr, cast(bool)sp, cast(bool)fn);
     }
     static int CHKCALL(PetitComputer p, wstring func)
     {
diff --git a/SMILEBASIC/graphic.d b/SMILEBASIC/graphic.d
index b6402bc..30a7cc0 100644
--- a/SMILEBASIC/graphic.d
+++ b/SMILEBASIC/graphic.d
@@ -114,8 +114,8 @@ class Graphic
     }
 
     bool[2] visibles = [true, true];
-    protected int[2] showPage = [0, 1];
-    protected int[2] usePage = [0, 1];
+    int[2] showPage = [0, 1];
+    int[2] usePage = [0, 1];
     bool visible()
     {
         return visibles[petitcom.displaynum];
@@ -323,7 +323,7 @@ class Graphic
     }
     abstract void gcopy(int srcpage, int x, int y, int x2, int y2, int x3, int y3, int cpmode);
     abstract void gtri(int x1, int y1, int x2, int y2, int x3, int y3, int color);
-    int[2] gprios = [511, 511];
+    int[2] gprios = [512, 512];
 
     @property ref gprio()
     {
diff --git a/SMILEBASIC/petitcomputer.d b/SMILEBASIC/petitcomputer.d
index ed3bcf8..e0c06f6 100644
--- a/SMILEBASIC/petitcomputer.d
+++ b/SMILEBASIC/petitcomputer.d
@@ -1634,6 +1634,51 @@ class PetitComputer
 
     Program program;
 
+    void acls(bool gclsAndSpriteImageBGImageInit, bool spdef, bool fontdef)
+    {
+        xscreen(0, 512, 4);
+        backcolor = 0;
+        console.width(8);
+        console.foreColors[] = 15;
+        console.backColors[] = 0;
+        console.CSRXs[] = 0;
+        console.CSRYs[] = 0;
+        console.CSRZs[] = 0;
+        console.attrs[] = ConsoleAttribute.TROT0;
+        if (gclsAndSpriteImageBGImageInit)
+        {
+            //TODO:sprite,bg
+            for (int i = 0; i <= 3; i++)
+            {
+                this.graphic.useGRP = i;
+                graphic.gcls(0, 0);
+            }
+        }
+        this.graphic.usePage = [0, 1];
+        this.graphic.showPage = [0, 1];
+        this.graphic.gprios = [512, 512];/*reference:GPRIO 1024*/
+        this.graphic.visibles = [1, 1];
+        this.sprite.sppage = [4, 4];
+        this.sprite.allclear();
+        this.sprite.visibles = [true, true];
+        this.bgpage = [5, 5];
+        this.BGvisibles = [true, true];
+        foreach (b; bg)
+        {
+            b.screen(25, 15);
+            b.clip();
+        }
+        if (spdef)
+        {
+            this.sprite.spdef();
+        }
+        if (fontdef)
+        {
+            //TODO
+        }
+
+    }
+
     //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 7d240ff..b50f9d8 100644
--- a/SMILEBASIC/sprite.d
+++ b/SMILEBASIC/sprite.d
@@ -978,6 +978,13 @@ class Sprite
             sprites[i].clear;
         }
     }
+    void allclear()
+    {
+        synchronized (this) for(int i = 0; i < sprites.length; i++)
+        {
+            sprites[i].clear;
+        }
+    }
     void sphome(int i, int hx, int hy)
     {
         i = spid(i);