diff --git a/src/emucore/AtariVox.cxx b/src/emucore/AtariVox.cxx
index 9cb60012f..b80f6de4b 100644
--- a/src/emucore/AtariVox.cxx
+++ b/src/emucore/AtariVox.cxx
@@ -51,8 +51,9 @@ bool AtariVox::read(DigitalPin pin)
   {
     // Pin 2: SpeakJet READY
     case DigitalPin::Two:
-      // For now, we just assume the device is always ready
-      return setPin(pin, true);
+    {
+      return setPin(pin, mySerialPort->isCTS());
+    }
 
     default:
       return SaveKey::read(pin);
diff --git a/src/emucore/SerialPort.hxx b/src/emucore/SerialPort.hxx
index aa08acbe8..f2ac5bf68 100644
--- a/src/emucore/SerialPort.hxx
+++ b/src/emucore/SerialPort.hxx
@@ -58,6 +58,14 @@ class SerialPort
     */
     virtual bool writeByte(uInt8 data) { return false; }
 
+    /**
+      Test for 'Clear To Send' enabled.  By default, assume it's always
+      OK to send more data.
+
+      @return  True if CTS signal enabled, else false
+    */
+    virtual bool isCTS() { return true; }
+
   private:
     // Following constructors and assignment operators not supported
     SerialPort(const SerialPort&) = delete;