diff --git a/apple410/__init__.py b/apple410/__init__.py
index a4838f3..557d9c2 100755
--- a/apple410/__init__.py
+++ b/apple410/__init__.py
@@ -9,12 +9,27 @@ def plot_to_svg(instream, outstream):
     p.read(instream)
     p.write(outstream)
 
-class Apple410:
-    """A simple class for queing up commands for the Apple 410"""
-    def __init__(self, portname, baud=9600, flow_control_safe=False, cts_hack=False):
-        self.serial = serial.Serial(portname, baud, rtscts=False, dsrdtr=True, timeout=0.1)
+class Apple410Common:
+    def __init__(self):
         self.pos = (0,0)
         self.wd = self.vp = (0,0,2394,1759)
+
+    def move_to(self, coords):
+        self.send('MA{},{}'.format(coords[0],coords[1]))
+        self.pos = coords
+
+    def draw_to(self, coords):
+        self.send('DA{:.2f},{:.2f}'.format(coords[0],coords[1]))
+        self.pos = coords
+            
+    def pen_select(self, index):
+        self.send('PS{}'.format(index))
+
+class Apple410(Apple410Common):
+    """A simple class for queing up commands for the Apple 410"""
+    def __init__(self, portname, baud=9600, flow_control_safe=False, cts_hack=False):
+        Apple410Common.__init__(self)
+        self.serial = serial.Serial(portname, baud, rtscts=False, dsrdtr=True, timeout=0.1)
         self.flow_control_safe = flow_control_safe
         self.cts_hack = cts_hack
 
@@ -39,14 +54,21 @@ class Apple410:
             self.sendchar(c)
         self.sendchar('\x03')
 
-    def move_to(self, coords):
-        self.send('MA{},{}'.format(coords[0],coords[1]))
-        self.pos = coords
+    def close(self):
+        self.serial.close()
+
+class MockApple410(Apple410Common):
+    def __init__(self, path):
+        Apple410Common.__init__(self)
+        if type(path) == type(''):
+            self.f = open(path,'w')
+        else:
+            self.f = path
+
+    def send(self, command):
+        self.f.write(command)
+        self.f.write('\n')
+
+    def close(self):
+        self.f.close()
 
-    def draw_to(self, coords):
-        self.send('DA{:.2f},{:.2f}'.format(coords[0],coords[1]))
-        self.pos = coords
-            
-    def pen_select(self, index):
-        self.send('PS{}'.format(index))
-    
diff --git a/apple410/cmdline.py b/apple410/cmdline.py
index b9e038e..974630d 100644
--- a/apple410/cmdline.py
+++ b/apple410/cmdline.py
@@ -47,3 +47,18 @@ def svg2plot():
         f = open(args.SVG)
     plot_svg(f,center=args.center)
 
+from .plot_to_svg import Plotter
+
+def plot2svg():
+    parser = argparse.ArgumentParser("plot2svg",
+            description="Convert a set of Apple 410 Color Plotter commands to an SVG")
+    parser.add_argument('PLOT', help='The plotter file to process. "-" will read plotter commands from standard input.')
+    args = parser.parse_args()
+    if args.PLOT == '-':
+        f = sys.stdin
+    else:
+        f = open(args.PLOT)
+    p = Plotter()
+    p.read(f)
+    p.write(sys.stdout)
+    
diff --git a/apple410/plot_to_svg.py b/apple410/plot_to_svg.py
index eb35c02..c9aade4 100755
--- a/apple410/plot_to_svg.py
+++ b/apple410/plot_to_svg.py
@@ -26,7 +26,7 @@ class Plotter:
         self.window = (0, 0, W, H)
         self.cur_g = None
         self.cur_d = None
-        self.d = svgwrite.Drawing(profile='tiny')
+        self.d = svgwrite.Drawing(profile='tiny',size=(W,H))
         self.text_theta = 0
         self.text_size = 1
         self.pos = (0,0)
@@ -161,7 +161,7 @@ class Plotter:
     def read(self,inf):
         for line in inf.readlines():
             line = line.strip()
-            p.process_cmd(line)
+            self.process_cmd(line)
 
 if __name__=='__main__':
     p = Plotter()
diff --git a/setup.py b/setup.py
index 66cd333..649a6b6 100644
--- a/setup.py
+++ b/setup.py
@@ -54,6 +54,7 @@ setup(
             'console_scripts': [
                 'apple410=apple410.cmdline:main',
                 'a410svg2plot=apple410.cmdline:svg2plot',
+                'a410plot2svg=apple410.cmdline:plot2svg',
                 ],
             },
     )