diff --git a/SMILEBASIC/builtinfunctions.d b/SMILEBASIC/builtinfunctions.d
index c3f4d68..98360a4 100644
--- a/SMILEBASIC/builtinfunctions.d
+++ b/SMILEBASIC/builtinfunctions.d
@@ -3174,6 +3174,10 @@ class BuiltinFunction
     {
         return p.program.get();
     }
+    static void PRGSET(PetitComputer p, wstring x)
+    {
+        p.program.set(x.dup);
+    }
     //alias void function(PetitComputer, Value[], Value[]) BuiltinFunc;
     static BuiltinFunctions[wstring] builtinFunctions;
     static wstring getBasicName(BFD)(const wstring def)
diff --git a/SMILEBASIC/program.d b/SMILEBASIC/program.d
index b7e55a2..c14b578 100644
--- a/SMILEBASIC/program.d
+++ b/SMILEBASIC/program.d
@@ -1,14 +1,20 @@
 module otya.smilebasic.program;
 import std.range;
 import std.container;
+import std.algorithm;
 
 struct Slot
 {
     DList!wstring program;
     DList!wstring.Range range;
+    this(T)(T)
+    {
+        program = make!(DList!wstring);
+        range = program[];
+    }
+
     void load(wstring data)
     {
-        import std.algorithm;
         program.clear();
         foreach(l; splitter(data, "\n"))
         {
@@ -78,6 +84,29 @@ struct Slot
         range.popFront();
         return a;
     }
+    void set(wstring v)
+    {
+        int i;
+        foreach(l; splitter(v, "\n"))
+        {
+            if (!range.empty && i == 0)
+            {
+                range.put(l ~ "\n");
+            }
+            else
+            {
+                if (range.empty)
+                {
+                    program.insertAfter(range, l ~ "\n");
+                }
+                else
+                {
+                    program.insertBefore(range, l ~ "\n");
+                }
+            }
+            i++;
+        }
+    }
 }
 
 class Program
@@ -88,6 +117,10 @@ class Program
     this()
     {
         slot = new Slot[5];
+        foreach(ref s; slot)
+        {
+            s = Slot(slot);
+        }
     }
     void edit(int slot, int line)
     {
@@ -98,4 +131,8 @@ class Program
     {
         return this.slot[currentSlot].get;
     }
+    void set(wstring v)
+    {
+        this.slot[currentSlot].set = v;
+    }
 }