diff --git a/SMILEBASIC/TEST.txt b/SMILEBASIC/TEST.txt
index de1072f..088081d 100644
--- a/SMILEBASIC/TEST.txt
+++ b/SMILEBASIC/TEST.txt
@@ -1,3 +1,7 @@
+TABSTEP=4
+FOR i=0 TO 20
+?"A","B",
+NEXT
 SPSET 0,1206
 SPANIM 0,"I",-90,1209,0
 WHILE 1
diff --git a/SMILEBASIC/VM.d b/SMILEBASIC/VM.d
index f081e33..0498631 100644
--- a/SMILEBASIC/VM.d
+++ b/SMILEBASIC/VM.d
@@ -224,7 +224,7 @@ class PrintCode : Code
                 case ValueType.String:
                     //write(arg.stringValue);
                     if(vm.petitcomputer)
-                        vm.petitcomputer.printConsole(arg.stringValue);
+                        vm.petitcomputer.printConsoleString(arg.stringValue);
                     break;
                 default:
                     //type mismatch
@@ -1421,7 +1421,7 @@ class PushSystemVariable : Code
     }
     override void execute(VM vm)
     {
-        vm.push(var.value(vm));
+        vm.push(var.value);
     }
     override string toString(VM vm)
     {
diff --git a/SMILEBASIC/compiler.d b/SMILEBASIC/compiler.d
index b616a88..4f6df42 100644
--- a/SMILEBASIC/compiler.d
+++ b/SMILEBASIC/compiler.d
@@ -192,12 +192,20 @@ class Compiler
         sysVariable["CSRZ"] = new CSRZ();
         addSystemVariable("VERSION", new Version());
         addSystemVariable("FREEMEM", new FreeMem());
+        addSystemVariable("TABSTEP", new TabStep());
     }
     void addSystemVariable(wstring name, SystemVariable var)
     {
         global[name] = VMVariable(-1);
         sysVariable[name] = var;
     }
+    void registerSystemVariable(VM vm)
+    {
+        foreach(k, ref v; sysVariable)
+        {
+            v.vm = vm;
+        }
+    }
     SystemVariable[wstring] sysVariable;
     Code[] code;
     VMVariable[wstring] global;
@@ -1030,7 +1038,9 @@ class Compiler
                 code[i] = new RestoreCode(s.data.label[restore.label], s.data);
             }
         }
-        return new VM(code, globalIndex + 1, global, functions, s.data, globalLabel, debugInfo);
+        VM vm = new VM(code, globalIndex + 1, global, functions, s.data, globalLabel, debugInfo);
+        registerSystemVariable(vm);
+        return vm;
     }
 }
 
diff --git a/SMILEBASIC/petitcomputer.d b/SMILEBASIC/petitcomputer.d
index 4e3c927..65690bf 100644
--- a/SMILEBASIC/petitcomputer.d
+++ b/SMILEBASIC/petitcomputer.d
@@ -1602,7 +1602,10 @@ class PetitComputer
             printConsoleString(i.to!wstring);
         }
     }
+    //0<=TABSTEP<=16
+    int TABSTEP = 4;
     byte consoleAttr;
+    int tab;
     void printConsoleString(wstring text)
     {
         //consolem.lock();
@@ -1614,16 +1617,32 @@ class PetitComputer
             {
                 CSRY = consoleHeightC - 1;
             }
-            if(c != '\r' && c != '\n')
+            if(c == '\t')
             {
-                consoleC[CSRY][CSRX].character = c;
-                consoleC[CSRY][CSRX].foreColor = consoleForeColor;
-                consoleC[CSRY][CSRX].backColor = consoleBackColor;
-                consoleC[CSRY][CSRX].z = CSRZ;
-                consoleC[CSRY][CSRX].attr = consoleAttr;
+                import std.algorithm : min;
+                if(tab == 2 && CSRX == 0)
+                {
+                    CSRX--;
+                }
+                else
+                {
+                    auto t = min(CSRX + TABSTEP - CSRX % TABSTEP, consoleWidthC - 1);
+                    consoleC[CSRY][CSRX..t] = ConsoleCharacter(0, consoleForeColor, consoleBackColor, consoleAttr, CSRZ);
+                    CSRX += TABSTEP - (CSRX % TABSTEP) - 1;
+                    if(CSRX + 1 >= consoleWidthC)
+                    {
+                        CSRX = consoleWidthC - 2;
+                    }
+                    tab = true;
+                }
+            }
+            else if(c != '\n')
+            {
+                consoleC[CSRY][CSRX] = ConsoleCharacter(c, consoleForeColor, consoleBackColor, consoleAttr, CSRZ);
+                tab = tab ? 2 : 0;
             }
             CSRX++;
-            if(CSRX >= consoleWidthC || c == '\n' || c == '\r')
+            if(CSRX >= consoleWidthC || c == '\n')
             {
                 CSRX = 0;
                 CSRY++;
diff --git a/SMILEBASIC/systemvariable.d b/SMILEBASIC/systemvariable.d
index dd96578..650a2d5 100644
--- a/SMILEBASIC/systemvariable.d
+++ b/SMILEBASIC/systemvariable.d
@@ -4,8 +4,9 @@ import otya.smilebasic.error;
 import otya.smilebasic.vm;
 class SystemVariable
 {
+    VM vm;
     @property
-        abstract Value value(VM vm);
+        abstract Value value();
     @property
         void value(Value value)
         {
@@ -18,7 +19,7 @@ import std.conv;
 class Date : SystemVariable
 {
     @property
-    override Value value(VM vm)
+    override Value value()
     {
         auto currentTime = Clock.currTime();
         wstring timeString = format("%04d/%02d/%02d", currentTime.year, currentTime.month, currentTime.day).to!wstring;
@@ -28,7 +29,7 @@ class Date : SystemVariable
 class Time : SystemVariable
 {
     @property
-    override Value value(VM vm)
+    override Value value()
     {
         auto currentTime = Clock.currTime();
         wstring timeString = format("%02d:%02d:%02d", currentTime.hour, currentTime.minute, currentTime.second).to!wstring;
@@ -38,7 +39,7 @@ class Time : SystemVariable
 class Maincnt : SystemVariable
 {
     @property
-        override Value value(VM vm)
+        override Value value()
         {
             return Value(vm.petitcomputer.maincnt);
         }
@@ -46,7 +47,7 @@ class Maincnt : SystemVariable
 class CSRX : SystemVariable
 {
     @property
-        override Value value(VM vm)
+        override Value value()
         {
             return Value(vm.petitcomputer.CSRX);
         }
@@ -54,7 +55,7 @@ class CSRX : SystemVariable
 class CSRY : SystemVariable
 {
     @property
-        override Value value(VM vm)
+        override Value value()
         {
             return Value(vm.petitcomputer.CSRY);
         }
@@ -62,15 +63,37 @@ class CSRY : SystemVariable
 class CSRZ : SystemVariable
 {
     @property
-        override Value value(VM vm)
+        override Value value()
         {
             return Value(vm.petitcomputer.CSRZ);
         }
 }
+class TabStep : SystemVariable
+{
+    @property
+        override Value value()
+        {
+            return Value(vm.petitcomputer.TABSTEP);
+        }
+    @property
+        override void value(Value value)
+        {
+            if(!value.isNumber)
+            {
+                throw new TypeMismatch();
+            }
+            int i = value.castInteger;
+            if(i < 0 || i > 16)
+            {
+                throw new OutOfRange();
+            }
+            vm.petitcomputer.TABSTEP = i;
+        }
+}
 class Version : SystemVariable
 {
     @property
-        override Value value(VM vm)
+        override Value value()
         {
             return Value(0x3010000);
         }
@@ -78,7 +101,7 @@ class Version : SystemVariable
 class FreeMem : SystemVariable
 {
     @property
-        override Value value(VM vm)
+        override Value value()
         {
             return Value(8327164);
         }