diff --git a/arch/serial.cc b/arch/serial.cc
index 2a6b2bc..8b7e5df 100644
--- a/arch/serial.cc
+++ b/arch/serial.cc
@@ -40,10 +40,13 @@ char Serial::readReg(RegisterIndex reg) {
 }
 
 int Serial::write(char out) {
-  // TODO: Implement
-  if(readReg(LINE_STATUS_REGISTER) & TRANSMITTER_EMPTY){
-      writeReg(TRANSMIT_BUFFER_REGISTER, out);
-      return out;
-  }
-  return -1;
+    //TODO fix behavior when \r\n ist actually sent
+    if(out == '\n')
+        write('\r');
+
+    if(readReg(LINE_STATUS_REGISTER) & TRANSMITTER_EMPTY){
+        writeReg(TRANSMIT_BUFFER_REGISTER, out);
+        return out;
+    }
+    return -1;
 }
diff --git a/device/serialstream.cc b/device/serialstream.cc
index 03dd558..7313626 100644
--- a/device/serialstream.cc
+++ b/device/serialstream.cc
@@ -5,55 +5,18 @@ SerialStream::SerialStream(ComPort port, BaudRate baud_rate, DataBits data_bits,
                            StopBits stop_bits, Parity parity)
     :Serial(port, baud_rate, data_bits, stop_bits, parity) {}
 
-void SerialStream::flush() {
-  print(buffer, strlen(buffer));
-}
-
-// https://stackoverflow.com/questions/3440726/what-is-the-proper-way-of-implementing-a-good-itoa-function
-// Yet, another good itoa implementation
-// returns: the length of the number string
-int itoa(int value, char *sp, int radix)
-{
-    char tmp[16];// be careful with the length of the buffer
-    char *tp = tmp;
-    int i;
-    unsigned v;
-
-    int sign = (radix == 10 && value < 0);    
-    if (sign)
-        v = -value;
-    else
-        v = (unsigned)value;
-
-    while (v || tp == tmp)
-    {
-        i = v % radix;
-        v /= radix;
-        if (i < 10)
-          *tp++ = i+'0';
-        else
-          *tp++ = i + 'a' - 10;
-    }
-
-    int len = tp - tmp;
+SerialStream sout = SerialStream();
 
-    if (sign) 
-    {
-        *sp++ = '-';
-        len++;
-    }
-
-    while (tp > tmp)
-        *sp++ = *--tp;
-
-    return len;
+void SerialStream::flush() {
+  print(sout.buffer, sout.pos);
+  sout.pos = 0;
 }
 
 void SerialStream::setForeground(Color c) {
     write(0x1b);
     write('[');
-    write('3');
-    write(c + 0x30);
+    sout <<  30+c;
+    flush();
     write('m');
 }
 
@@ -78,15 +41,18 @@ void SerialStream::reset() {
 }
 
 void SerialStream::setPos(int x, int y) {
-    char out[] = {0x1b, '[', 0, 0, ';', 0, 0, 'H', 0};
+    //char out[] = {0x1b, '[', 0, 0, ';', 0, 0, 'H', 0};
     //*this << 0x1b;
-    //*this << '[';
-    //*this << dec << x;
-    //*this << ';' << y << 'H' << endl;
-    //flush();
-    itoa(x, &out[2], 10);
-    itoa(y, &out[5], 10);
-    print( out , strlen(out));
+    write(0x1b);
+    sout << '[';
+    sout << dec << x;
+    sout << ';';
+    sout << dec << y;
+    sout << 'H';
+    flush();
+    //itoa(x, &out[2], 10);
+    //itoa(y, &out[5], 10);
+    //print( out , strlen(out));
 }
 
 void SerialStream::print(char* str, int length) {
diff --git a/device/serialstream.h b/device/serialstream.h
index 83450ee..d1708ff 100644
--- a/device/serialstream.h
+++ b/device/serialstream.h
@@ -141,3 +141,6 @@ class SerialStream : public OutputStream, public Serial {
    */
   void print(char* str, int length);
 };
+
+extern SerialStream sout;
+
diff --git a/device/textstream.cc b/device/textstream.cc
index b7dd125..0a210d3 100644
--- a/device/textstream.cc
+++ b/device/textstream.cc
@@ -15,7 +15,4 @@ TextStream::TextStream(unsigned from_col,
 void TextStream::flush() {
   print(buffer,pos);
   pos = 0;
-  
-
-
 }
diff --git a/main.cc b/main.cc
index a6666cf..eaa21ce 100644
--- a/main.cc
+++ b/main.cc
@@ -36,7 +36,23 @@ extern "C" int main() {
   ss.setBackground(SerialStream::CYAN);
   ss.print("test", 4);
   ss.setPos(10, 10);
-  ss.print("test", 4);
+  ss.print("test\n", 5);
+  ss.setBackground(SerialStream::BLACK);
+  
+  kout << "Test          <stream result> -> <expected>" << endl;
+  kout << "bool:         " << true << " -> true" << endl;
+  kout << "zero:         " << 0 << " -> 0" << endl;
+  kout << "binary:       " << bin << 42 << dec << " -> 0b101010" << endl;
+  kout << "octal:        " << oct << 42 << dec << " -> 052" << endl;
+  kout << "hex:          " << hex << 42 << dec << " -> 0x2a" << endl;
+  kout << "uint64_t max: " << ~((uint64_t)0) << " -> 18446744073709551615" << endl;
+  kout << "int64_t max:  " << ~(1ll<<63) << " -> 9223372036854775807" << endl;
+  kout << "int64_t min:  " << (1ll<<63) << " -> -9223372036854775808" << endl;
+  kout << "some int64_t: " << (-1234567890123456789) << " -> -1234567890123456789" << endl;
+  kout << "some int64_t: " << (1234567890123456789) << " -> 1234567890123456789" << endl;
+  kout << "pointer:      " << reinterpret_cast<void*>(1994473406541717165ull)
+      << " -> 0x1badcafefee1dead" << endl;
+  kout << "smiley:       " << static_cast<char>(1) << endl;
 
   /* Start application processors
    * To avoid unexpected behaviour, make sure that interrupts are not
diff --git a/object/stringbuffer.cc b/object/stringbuffer.cc
index c0f0903..bbdb312 100644
--- a/object/stringbuffer.cc
+++ b/object/stringbuffer.cc
@@ -1,3 +1,7 @@
 #include "stringbuffer.h"
 
-void Stringbuffer::put(char c) { (void)c; }
+void Stringbuffer::put(char c) {
+    buffer[pos++] = c;
+    if(pos > 80)
+        flush();
+}
diff --git a/tools/qemu.mk b/tools/qemu.mk
index 7526310..af6fbff 100644
--- a/tools/qemu.mk
+++ b/tools/qemu.mk
@@ -59,7 +59,7 @@ kvm: all
 
 # Execute Qemu with activated GDB stub and directly connect GDB to the spawned Qemu.
 gdb: all
-	${VERBOSE}  $(GDB) "$(DBGKERNEL)" \
+	${VERBOSE} cgdb -d $(GDB) "$(DBGKERNEL)" \
 		-ex "set arch $(DBGARCH)" \
 		-ex "target remote | exec $(QEMU) -gdb stdio $(QEMUKERNEL) -smp $(QEMUCPUS) -S $(QEMUFLAGS) $(DBGFLAGS)"