diff --git a/SMILEBASIC/builtinfunctions.d b/SMILEBASIC/builtinfunctions.d
index a206ca7..557aff3 100644
--- a/SMILEBASIC/builtinfunctions.d
+++ b/SMILEBASIC/builtinfunctions.d
@@ -327,6 +327,10 @@ class BuiltinFunction
     {
         return str[0..len];
     }
+    static wstring RIGHT(wstring str, int len)
+    {
+        return str[$ - len..$];
+    }
     static wstring SUBST(wstring str, int i, Value alen, DefaultValue!(Value,false) areplace)
     {
         int len = 1;
diff --git a/SMILEBASIC/compiler.d b/SMILEBASIC/compiler.d
index fd6b133..8d6ee68 100644
--- a/SMILEBASIC/compiler.d
+++ b/SMILEBASIC/compiler.d
@@ -168,8 +168,14 @@ class Compiler
         sysVariable["CSRY"] = new CSRY();
         global["CSRZ"] = VMVariable(-1);
         sysVariable["CSRZ"] = new CSRZ();
+        addSystemVariable("VERSION", new Version());
+        addSystemVariable("FREEMEM", new FreeMem());
+    }
+    void addSystemVariable(wstring name, SystemVariable var)
+    {
+        global[name] = VMVariable(-1);
+        sysVariable[name] = var;
     }
-
     SystemVariable[wstring] sysVariable;
     Code[] code;
     VMVariable[wstring] global;
diff --git a/SMILEBASIC/petitcomputer.d b/SMILEBASIC/petitcomputer.d
index 363dac9..54e2ed5 100644
--- a/SMILEBASIC/petitcomputer.d
+++ b/SMILEBASIC/petitcomputer.d
@@ -15,9 +15,9 @@ import otya.smilebasic.error;
 import otya.smilebasic.bg;
 import otya.smilebasic.parser;
 const static rot_test_deg = 45f;
-const static rot_test_x = 1f;
-const static rot_test_y = 0f;
-const static rot_test_z = 0f;
+const static rot_test_x = 0f;
+const static rot_test_y = 1f;
+const static rot_test_z = 1f;
 enum Button
 {
     NONE = 0,
diff --git a/SMILEBASIC/systemvariable.d b/SMILEBASIC/systemvariable.d
index 3916032..dd96578 100644
--- a/SMILEBASIC/systemvariable.d
+++ b/SMILEBASIC/systemvariable.d
@@ -67,4 +67,19 @@ class CSRZ : SystemVariable
             return Value(vm.petitcomputer.CSRZ);
         }
 }
-
+class Version : SystemVariable
+{
+    @property
+        override Value value(VM vm)
+        {
+            return Value(0x3010000);
+        }
+}
+class FreeMem : SystemVariable
+{
+    @property
+        override Value value(VM vm)
+        {
+            return Value(8327164);
+        }
+}