diff --git a/SMILEBASIC/bg.d b/SMILEBASIC/bg.d
index 0103540..b927f0c 100644
--- a/SMILEBASIC/bg.d
+++ b/SMILEBASIC/bg.d
@@ -11,6 +11,10 @@ struct BGChip
     {
         return i;
     }
+    void screenData(int a)
+    {
+        i = a;
+    }
 }
 //912枚まで描画されるみたい
 //->899枚まで描画してその後は一番下のみ描画の様子
@@ -179,4 +183,20 @@ class BG
             return chip[x + y * width].screenData;
         }
     }
+    void save(T)(int x, int y, int w, int h, T[] array)
+        if (is(T == int) || is(T == double))
+        {
+            int desti;
+            for (int i = x; i < x + w; i++)
+            {
+                for (int j = y; j < y + h; j++)
+                {
+                    desti++;
+                    int index = i + j * width;
+                    if (index < 0)
+                        continue;
+                    array[desti - 1] = cast(int)chip[index].screenData;
+                }
+            }
+        }
 }
diff --git a/SMILEBASIC/builtinfunctions.d b/SMILEBASIC/builtinfunctions.d
index 2671e06..a4241b1 100644
--- a/SMILEBASIC/builtinfunctions.d
+++ b/SMILEBASIC/builtinfunctions.d
@@ -1828,6 +1828,42 @@ class BuiltinFunction
     {
         return p.getBG(layer).get(x, y, flag);
     }
+    static void BGSAVE(PetitComputer p, int layer, int x, int y, int w, int h, Value ary)
+    {
+        if (w < 1)
+        {
+            throw new OutOfRange("BGSAVE", 4);
+        }
+        if (h < 1)
+        {
+            throw new OutOfRange("BGSAVE", 4);
+        }
+        if (!ary.isNumberArray)
+        {
+            throw new TypeMismatch("BGSAVE", 6);
+        }
+        if (ary.type == ValueType.IntegerArray)
+        {
+            if (w * h > ary.length)
+                ary.integerArray.length = w * h;
+            p.getBG(layer).save(x, y, w, h, ary.integerArray.array);
+        }
+        if (ary.type == ValueType.DoubleArray)
+        {
+            if (w * h > ary.length)
+                ary.doubleArray.length = w * h;
+            p.getBG(layer).save(x, y, w, h, ary.doubleArray.array);
+        }
+        
+    }
+    static void BGSAVE(PetitComputer p, int layer, Value ary)
+    {
+        if (!ary.isNumberArray)
+        {
+            throw new TypeMismatch("BGSAVE", 2);
+        }
+        BGSAVE(p, layer, 0, 0, p.getBG(layer).width, p.getBG(layer).height, ary);
+    }
     static void EFCON()
     {
     }