diff --git a/stella/src/emucore/OSystem.cxx b/stella/src/emucore/OSystem.cxx
index e1c969433..2d026df9c 100644
--- a/stella/src/emucore/OSystem.cxx
+++ b/stella/src/emucore/OSystem.cxx
@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: OSystem.cxx,v 1.123 2008-04-11 17:56:34 stephena Exp $
+// $Id: OSystem.cxx,v 1.124 2008-04-14 15:12:55 stephena Exp $
 //============================================================================
 
 #include <cassert>
@@ -38,8 +38,8 @@
   #include "SerialPortUNIX.hxx"
 #elif defined(WIN32)
   #include "SerialPortWin32.hxx"
-//#elif defined(MAC_OSX)
-//  #include "SerialPortMACOSX.hxx"
+#elif defined(MAC_OSX)
+  #include "SerialPortMACOSX.hxx"
 #endif
 
 #include "FSNode.hxx"
@@ -222,8 +222,8 @@ bool OSystem::create()
   mySerialPort = new SerialPortUNIX();
 #elif defined(WIN32)
   mySerialPort = new SerialPortWin32();
-//#elif defined(MAC_OSX)
-//  mySerialPort = new SerialPortMACOSX();
+#elif defined(MAC_OSX)
+  mySerialPort = new SerialPortMACOSX();
 #else
   // Create an 'empty' serial port
   mySerialPort = new SerialPort();
diff --git a/stella/src/macosx/SerialPortMACOSX.cxx b/stella/src/macosx/SerialPortMACOSX.cxx
new file mode 100644
index 000000000..349556129
--- /dev/null
+++ b/stella/src/macosx/SerialPortMACOSX.cxx
@@ -0,0 +1,78 @@
+//============================================================================
+//
+//   SSSS    tt          lll  lll       
+//  SS  SS   tt           ll   ll        
+//  SS     tttttt  eeee   ll   ll   aaaa 
+//   SSSS    tt   ee  ee  ll   ll      aa
+//      SS   tt   eeeeee  ll   ll   aaaaa  --  "An Atari 2600 VCS Emulator"
+//  SS  SS   tt   ee      ll   ll  aa  aa
+//   SSSS     ttt  eeeee llll llll  aaaaa
+//
+// Copyright (c) 1995-2008 by Bradford W. Mott and the Stella team
+//
+// See the file "license" for information on usage and redistribution of
+// this file, and for a DISCLAIMER OF ALL WARRANTIES.
+//
+// $Id: SerialPortMACOSX.cxx,v 1.1 2008-04-14 15:12:55 stephena Exp $
+//============================================================================
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/errno.h>
+#include <sys/termios.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <sys/filio.h>
+#include <sys/ioctl.h>
+
+#include "SerialPortMACOSX.hxx"
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+SerialPortMACOSX::SerialPortMACOSX()
+  : SerialPort(),
+    myHandle(0)
+{
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+SerialPortMACOSX::~SerialPortMACOSX()
+{
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+bool SerialPortMACOSX::openPort(const string& device)
+{
+  myHandle = open(device.c_str(), O_RDWR | O_NOCTTY | O_NONBLOCK);
+  if(myHandle <= 0)
+    return false;
+
+  struct termios termios;
+  memset(&termios, 0, sizeof(struct termios));
+
+  termios.c_cflag = CREAD | CLOCAL;
+  termios.c_cflag |= B19200;
+  termios.c_cflag |= CS8;
+  tcflush(myHandle, TCIFLUSH);
+  tcsetattr(myHandle, TCSANOW, &termios);
+
+  return true;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void SerialPortMACOSX::closePort()
+{
+  if(myHandle)
+    close(myHandle);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+bool SerialPortMACOSX::writeByte(const uInt8* data)
+{
+  if(myHandle)
+  {
+//    cerr << "SerialPortMACOSX::writeByte " << (int)(*data) << endl;
+    return write(myHandle, data, 1) == 1;
+  }
+  return false;
+}
diff --git a/stella/src/macosx/SerialPortMACOSX.hxx b/stella/src/macosx/SerialPortMACOSX.hxx
new file mode 100644
index 000000000..8ded78d2e
--- /dev/null
+++ b/stella/src/macosx/SerialPortMACOSX.hxx
@@ -0,0 +1,63 @@
+//============================================================================
+//
+//   SSSS    tt          lll  lll       
+//  SS  SS   tt           ll   ll        
+//  SS     tttttt  eeee   ll   ll   aaaa 
+//   SSSS    tt   ee  ee  ll   ll      aa
+//      SS   tt   eeeeee  ll   ll   aaaaa  --  "An Atari 2600 VCS Emulator"
+//  SS  SS   tt   ee      ll   ll  aa  aa
+//   SSSS     ttt  eeeee llll llll  aaaaa
+//
+// Copyright (c) 1995-2008 by Bradford W. Mott and the Stella team
+//
+// See the file "license" for information on usage and redistribution of
+// this file, and for a DISCLAIMER OF ALL WARRANTIES.
+//
+// $Id: SerialPortMACOSX.hxx,v 1.1 2008-04-14 15:12:55 stephena Exp $
+//============================================================================
+
+#ifndef SERIALPORT_UNIX_HXX
+#define SERIALPORT_UNIX_HXX
+
+#include "SerialPort.hxx"
+
+/**
+  Implement reading and writing from a serial port under OSX.  For now,
+  reading isn't actually supported at all.
+
+  @author  Stephen Anthony & D. Spice
+  @version $Id: SerialPortMACOSX.hxx,v 1.1 2008-04-14 15:12:55 stephena Exp $
+*/
+class SerialPortMACOSX : public SerialPort
+{
+  public:
+    SerialPortMACOSX();
+    virtual ~SerialPortMACOSX();
+
+    /**
+      Open the given serial port with the specified attributes.
+
+      @param device  The name of the port
+      @return  False on any errors, else true
+    */
+    bool openPort(const string& device);
+
+    /**
+      Close a previously opened serial port.
+    */
+    void closePort();
+
+    /**
+      Write a byte to the serial port.
+
+      @param data  The byte to write to the port
+      @return  True if a byte was written, else false
+    */
+    bool writeByte(const uInt8* data);
+
+  private:
+    // File descriptor for serial connection
+    int myHandle;
+};
+
+#endif