Fix MPU status display from wrapping unexpectedly on some terminals.

The unexpected wrapping was caused by passing a multiline string to
Cmd.prompt.  Cmd in turn passes the prompt string to raw_input(),
which expects only a single line.

CHANGES.txt

@@ -8,6 +8,9 @@
 
   - Reformatted source code to comply with PEP8.
 
+  - Fixed a bug where the MPU status display would wrap unexpectedly
+    on some terminals.
+
 0.13 (2012-11-15)
 
   - Fixed a bug where negative numbers could be entered

py65/devices/mpu65org16.py

@@ -44,5 +44,5 @@ class MPU(mpu6502.MPU):
     disassemble = mpu6502.MPU.disassemble[:]
 
     def reprformat(self):
-        return ("%s PC      AC   XR   YR   SP   NV---------BDIZC\n" +
+        return ("%s   PC     AC   XR   YR   SP  NV---------BDIZC\n" +
                 "%s: %08x %04x %04x %04x %04x %s")

py65/monitor.py

@@ -43,9 +43,10 @@ class Monitor(cmd.Cmd):
             argv = sys.argv
         self._reset(self.mpu_type)
         self._width = 78
-        self._update_prompt()
+        self.prompt = "."
         self._add_shortcuts()
         cmd.Cmd.__init__(self, completekey, stdin, stdout)
+        self._output_mpu_status()
         self._parse_args(argv)
 
     def _parse_args(self, argv):
@@ -109,7 +110,7 @@ class Monitor(cmd.Cmd):
             error = 'Error: %s, %s: file: %s line: %s' % (t, v, file, line)
             self._output(error)
 
-        self._update_prompt()
+        self._output_mpu_status()
         return result
 
     def _reset(self, mpu_type):
@@ -211,8 +212,8 @@ class Monitor(cmd.Cmd):
 
         self._mpu.memory = m
 
-    def _update_prompt(self):
-        self.prompt = "\n%s\n." % repr(self._mpu)
+    def _output_mpu_status(self):
+        self._output("\n" + repr(self._mpu))
 
     def _output(self, stuff):
         if stuff is not None: