diff --git a/script/stream b/script/stream
new file mode 100755
index 0000000..fcd4c6b
--- /dev/null
+++ b/script/stream
@@ -0,0 +1,2 @@
+#!/opt/local/bin/ruby
+require 'stream'
\ No newline at end of file
diff --git a/script/stream.rb b/script/stream.rb
new file mode 100644
index 0000000..9dbaa94
--- /dev/null
+++ b/script/stream.rb
@@ -0,0 +1,38 @@
+require 'rubygems'
+require 'optparse'
+require 'serialport'
+
+
+options_parser = OptionParser.new do |opts|
+  opts.banner = "Usage: stream [options] gcode-file"
+  opts.on('-v', '--verbose', 'Output more information') do
+    $verbose = true
+  end   
+  
+  opts.on('-h', '--help', 'Display this screen') do
+    puts opts
+    exit
+  end
+end
+options_parser.parse!
+if ARGV.empty?
+  puts options_parser
+  exit
+end
+
+SerialPort.open('/dev/tty.usbserial-A4001o6L', 9600) do |sp|
+  ARGV.each do |file|
+    puts "Processing file #{file}"
+    prebuffer = 5
+    File.readlines(file).each do |line|
+      sp.write("#{line.strip}\r\n");
+      puts line.strip
+      if prebuffer == 0
+        result = sp.gets 
+        puts result unless result.strip == 'ok'
+      else
+        prebuffer -= 1
+      end
+    end
+  end
+end
\ No newline at end of file
diff --git a/script/test.gcode b/script/test.gcode
new file mode 100644
index 0000000..2af194b
--- /dev/null
+++ b/script/test.gcode
@@ -0,0 +1,112 @@
+G90
+F1000
+G1 X-27.7814 Y11.3222 
+G1 X-13.7952 Y1.99803 
+G1 X-27.7814 Y11.3222 
+G1 X-27.7814 Y1.99803 
+G1 X-27.7814 Y11.3222 
+G1 X-27.7814 Y1.99803 
+G1 X-13.7952 Y1.99803 
+G1 X-13.7952 Y11.3222 
+G1 X-13.7952 Y1.99803 
+G1 X-10.8055 Y21.1219 
+G1 X-11.3961 Y19.7548 
+G1 X-11.558 Y17.878 
+G1 X-10.7814 Y15.9202 
+G1 X-9.92396 Y14.9009 
+G1 X-8.12809 Y13.8007 
+G1 X-6.25129 Y13.6388 
+G1 X-4.80324 Y13.9866 
+G1 X-3.27425 Y15.2728 
+G1 X-2.68367 Y16.64 
+G1 X-2.52182 Y18.5168 
+G1 X-3.29837 Y20.4745 
+G1 X-4.15584 Y21.4938 
+G1 X-5.95171 Y22.5941 
+G1 X-7.8285 Y22.7559 
+G1 X-9.27656 Y22.4081 
+G1 X-10.8055 Y21.1219 
+G1 X4.27576 Y18.746 
+G1 X12.2103 Y17.788 
+G1 X12.3699 Y19.1104 
+G1 X11.8684 Y20.5127 
+G1 X11.287 Y21.2537 
+G1 X10.0444 Y22.0746 
+G1 X8.06077 Y22.3141 
+G1 X6.65853 Y21.8125 
+G1 X5.17645 Y20.6498 
+G1 X4.27576 Y18.746 
+G1 X4.1161 Y17.4235 
+G1 X4.53783 Y15.3601 
+G1 X5.70059 Y13.878 
+G1 X6.94317 Y13.0572 
+G1 X8.9268 Y12.8177 
+G1 X10.329 Y13.3192 
+G1 X11.8111 Y14.482 
+G1 X23.6509 Y14.951 
+G1 X14.8687 Y7.80509 
+G1 X13.7392 Y6.02745 
+G1 X14.0633 Y4.5739 
+G1 X14.904 Y3.5407 
+G1 X18.7737 Y13.5584 
+G1 X21.7161 Y9.94214 
+G1 X18.7737 Y13.5584 
+G1 X23.2352 Y1.31533 
+G1 X14.0474 Y-0.273848 
+G1 X23.2352 Y1.31533 
+G1 X19.2976 Y0.634252 
+G1 X21.3799 Y0.318524 
+G1 X22.9194 Y-0.766981 
+G1 X23.8027 Y-1.966 
+G1 X24.1433 Y-3.9348 
+G1 X18.6913 Y-14.6127 
+G1 X18.6517 Y-13.1239 
+G1 X18.0086 Y-11.3533 
+G1 X16.4803 Y-9.90425 
+G1 X15.2734 Y-9.34046 
+G1 X13.1813 Y-9.0982 
+G1 X11.4107 Y-9.74125 
+G1 X10.2435 Y-10.6662 
+G1 X9.39784 Y-12.4764 
+G1 X9.43747 Y-13.9651 
+G1 X10.0805 Y-15.7357 
+G1 X11.6089 Y-17.1848 
+G1 X12.8157 Y-17.7486 
+G1 X14.9078 Y-17.9909 
+G1 X16.6784 Y-17.3478 
+G1 X17.8456 Y-16.4229 
+G1 X18.6913 Y-14.6127 
+G1 X4.61246 Y-22.8107 
+G1 X0.289415 Y-9.50937 
+G1 X0.289415 YG1 X-9.50937 
+G1 X4.61246 Y-22.8107 
+G1 X3.99488 Y-20.9105 
+G1 X3.13981 Y-22.589 
+G1 X2.07887 Y-23.6341 
+G1 X0.178684 Y-24.2517 
+G1 X-1.29397 Y-24.03 
+G1 X-2.97248 Y-23.175 
+G1 X-4.22345 Y-21.4806 
+G1 X-4.63517 Y-20.2138 
+G1 X-4.61935 Y-18.1078 
+G1 X-3.76428 Y-16.4293 
+G1 X-2.70335 Y-15.3842 
+G1 X-0.803156 Y-14.7666 
+G1 X0.669496 Y-14.9883 
+G1 X2.34801 Y-15.8433 
+G1 X-10.9479 Y-15.8062 
+G1 X-17.9553 Y-11.9629 
+G1 X-18.5959 Y-13.1308 
+G1 X-18.6525 Y-14.619 
+G1 X-18.3888 Y-15.5232 
+G1 X-17.5412 Y-16.7477 
+G1 X-15.7893 Y-17.7085 
+G1 X-14.3011 Y-17.7651 
+G1 X-12.4927 Y-17.2378 
+G1 X-10.9479 Y-15.8062 
+G1 X-10.3074 Y-14.6383 
+G1 X-9.93052 Y-12.5662 
+G1 X-10.4579 Y-10.7577 
+G1 X-11.3055 Y-9.53325 
+G1 X-13.0573 Y-8.57243 
+G1 X-14.5455 Y-8.51583
diff --git a/serial_protocol.c b/serial_protocol.c
index 3a30942..2b7545c 100644
--- a/serial_protocol.c
+++ b/serial_protocol.c
@@ -32,7 +32,7 @@ char line[BLOCK_BUFFER_SIZE];
 uint8_t line_counter;
 
 void prompt() {
-  printString("\r\n@");
+  printString("ok\r\n");
   line_counter = 0;
 }