diff --git a/STM32F1/cores/maple/usb_serial.cpp b/STM32F1/cores/maple/usb_serial.cpp
index 1fe2bf4..d5bced8 100644
--- a/STM32F1/cores/maple/usb_serial.cpp
+++ b/STM32F1/cores/maple/usb_serial.cpp
@@ -119,7 +119,7 @@ size_t n = 0;
 size_t USBSerial::write(const uint8 *buf, uint32 len)
 {
 size_t n = 0;
-    if (!this->isConnected() || !buf) {
+    if (!(bool) *this || !buf) {
         return 0;
     }
 
@@ -190,10 +190,6 @@ uint8 USBSerial::pending(void) {
     return usb_cdcacm_get_pending();
 }
 
-uint8 USBSerial::isConnected(void) {
-    return usb_is_connected(USBLIB) && usb_is_configured(USBLIB) && usb_cdcacm_get_dtr();
-}
-
 uint8 USBSerial::getDTR(void) {
     return usb_cdcacm_get_dtr();
 }
@@ -202,6 +198,10 @@ uint8 USBSerial::getRTS(void) {
     return usb_cdcacm_get_rts();
 }
 
+USBSerial::operator bool() {
+    return usb_is_connected(USBLIB) && usb_is_configured(USBLIB) && usb_cdcacm_get_dtr();
+}
+
 #if BOARD_HAVE_SERIALUSB
 	#ifdef SERIAL_USB 
 		USBSerial Serial;
diff --git a/STM32F1/cores/maple/usb_serial.h b/STM32F1/cores/maple/usb_serial.h
index 3146a3c..d6c3e02 100644
--- a/STM32F1/cores/maple/usb_serial.h
+++ b/STM32F1/cores/maple/usb_serial.h
@@ -44,41 +44,50 @@ public:
 
     void begin(void);
 
-	// Roger Clark. Added dummy function so that existing Arduino sketches which specify baud rate will compile.
-	void begin(unsigned long);
-	void begin(unsigned long, uint8_t);
+    // Roger Clark. Added dummy function so that existing Arduino sketches which specify baud rate will compile.
+    void begin(unsigned long);
+    void begin(unsigned long, uint8_t);
     void end(void);
 
-	operator bool() { return true; } // Roger Clark. This is needed because in cardinfo.ino it does if (!Serial) . It seems to be a work around for the Leonardo that we needed to implement just to be compliant with the API
-
     virtual int available(void);// Changed to virtual
 
     uint32 read(uint8 * buf, uint32 len);
-   // uint8  read(void);
+    // uint8  read(void);
 
-	// Roger Clark. added functions to support Arduino 1.0 API
+    // Roger Clark. added functions to support Arduino 1.0 API
     virtual int peek(void);
     virtual int read(void);
     int availableForWrite(void);
     virtual void flush(void);
-	
-	
+
+
     size_t write(uint8);
     size_t write(const char *str);
     size_t write(const uint8*, uint32);
 
     uint8 getRTS();
     uint8 getDTR();
-    uint8 isConnected();
     uint8 pending();
 
+    /* SukkoPera: This is the Arduino way to check if an USB CDC serial
+     * connection is open.
+
+     * Used for instance in cardinfo.ino.
+     */
+    operator bool();
+
+    /* Old libmaple way to check for serial connection.
+     *
+     * Deprecated, use the above.
+     */
+    uint8 isConnected() __attribute__((deprecated("Use !Serial instead"))) { return (bool) *this; }
+
 protected:
     static bool _hasBegun;
 };
 
-#ifdef SERIAL_USB 
-	extern USBSerial Serial;
+#ifdef SERIAL_USB
+    extern USBSerial Serial;
 #endif
 
 #endif
-
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/BlinkNcount/BlinkNcount.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/BlinkNcount/BlinkNcount.ino
index 7cabfde..1b1f58a 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/BlinkNcount/BlinkNcount.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/BlinkNcount/BlinkNcount.ino
@@ -15,7 +15,7 @@ void setup() {
   // Initialize virtual COM over USB on Maple Mini
   Serial.begin(9600);  // BAUD has no effect on USB serial: placeholder for physical UART
   // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/IntegerInput/IntegerInput.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/IntegerInput/IntegerInput.ino
index 55a68e8..4a1d16a 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/IntegerInput/IntegerInput.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/IntegerInput/IntegerInput.ino
@@ -18,7 +18,7 @@ void setup()
   Serial.begin(BAUD);  // BAUD has no effect on USB serial: placeholder for physical UART
   Serial.setTimeout(timeoutPeriod); // default is 1 second
   // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/IntegerInput_FloatOutput/IntegerInput_FloatOutput.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/IntegerInput_FloatOutput/IntegerInput_FloatOutput.ino
index 6f04840..b82394e 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/IntegerInput_FloatOutput/IntegerInput_FloatOutput.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/IntegerInput_FloatOutput/IntegerInput_FloatOutput.ino
@@ -19,7 +19,7 @@ void setup()
   Serial.begin(BAUD);  // BAUD has no effect on USB serial: placeholder for physical UART
   Serial.setTimeout(timeoutPeriod); // default is 1 second
   // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/InternalTempSensor/InternalTempSensor.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/InternalTempSensor/InternalTempSensor.ino
index d6000cd..871ae25 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/InternalTempSensor/InternalTempSensor.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/InternalTempSensor/InternalTempSensor.ino
@@ -38,7 +38,7 @@ void setup(void)
   pinMode(A_RANDOM_ANALOG_PIN, INPUT_ANALOG);
 
 // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink
@@ -48,7 +48,7 @@ void setup(void)
   setup_temperature_sensor();
   
 // announce start up
-  if(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS()))
+  if(Serial)
     Serial.println("Temp mon startup");
 }
 
@@ -69,7 +69,7 @@ void loop(void)
   t2 = micros();
   vsense = adc_read(ADC1, 16);
   t3 = micros();
-  if(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())) {
+  if(Serial) {
     sprintf(buf,"%04x %08x  %04x %08x" , vsense, t3-t2, alogpin, t2-t1);
     Serial.println(buf);
   }
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/PrimeNos/PrimeNos.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/PrimeNos/PrimeNos.ino
index 09a7a3f..c744219 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/PrimeNos/PrimeNos.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/PrimeNos/PrimeNos.ino
@@ -29,7 +29,7 @@ void setup()
   pinMode(33, OUTPUT);
   Serial.begin(BAUD);  // BAUD has no effect on USB serial: placeholder for physical UART
   // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/PrimeNos2/PrimeNos2.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/PrimeNos2/PrimeNos2.ino
index 51fe332..a2fd1c9 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/PrimeNos2/PrimeNos2.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/PrimeNos2/PrimeNos2.ino
@@ -18,7 +18,7 @@ void setup() {
   pinMode(33, OUTPUT);
   Serial.begin(BAUD);  // BAUD has no effect on USB serial: placeholder for physical UART
   // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/PrimeNos3/PrimeNos3.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/PrimeNos3/PrimeNos3.ino
index eec3dc0..8e8fe88 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/PrimeNos3/PrimeNos3.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/PrimeNos3/PrimeNos3.ino
@@ -18,7 +18,7 @@ void setup() {
   pinMode(33, OUTPUT);
   Serial.begin(BAUD);  // BAUD has no effect on USB serial: placeholder for physical UART
   // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/Print_Binary/Print_Binary.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/Print_Binary/Print_Binary.ino
index c9c4b88..7409ba5 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/Print_Binary/Print_Binary.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/Print_Binary/Print_Binary.ino
@@ -15,7 +15,7 @@ void setup()
   pinMode(33, OUTPUT);
   Serial.begin(BAUD);  // BAUD has no effect on USB serial: placeholder for physical UART
   // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/Print_Float/Print_Float.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/Print_Float/Print_Float.ino
index 289db9e..4351d31 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/Print_Float/Print_Float.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/Print_Float/Print_Float.ino
@@ -17,7 +17,7 @@ void setup()                    // run once, when the sketch starts
   pinMode(33, OUTPUT);
   Serial.begin(BAUD);  // BAUD has no effect on USB serial: placeholder for physical UART
   // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/Print_HEX/Print_HEX.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/Print_HEX/Print_HEX.ino
index cfdb977..2dc41fe 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/Print_HEX/Print_HEX.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/Print_HEX/Print_HEX.ino
@@ -16,7 +16,7 @@ void setup()                    // run once, when the sketch starts
   pinMode(33, OUTPUT);
   Serial.begin(BAUD);  // BAUD has no effect on USB serial: placeholder for physical UART
   // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/SerialReadUntil/SerialReadUntil.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/SerialReadUntil/SerialReadUntil.ino
index 1e7d400..80d3b3b 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/SerialReadUntil/SerialReadUntil.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/SerialReadUntil/SerialReadUntil.ino
@@ -13,7 +13,7 @@ void setup() {
   pinMode(33, OUTPUT);
   Serial.begin(BAUD);  // BAUD has no effect on USB serial: placeholder for physical UAR
     // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/StringEx_Parsing/StringEx_Parsing.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/StringEx_Parsing/StringEx_Parsing.ino
index d98193c..fd30b4c 100644
Binary files a/STM32F1/libraries/A_STM32_Examples/examples/General/StringEx_Parsing/StringEx_Parsing.ino and b/STM32F1/libraries/A_STM32_Examples/examples/General/StringEx_Parsing/StringEx_Parsing.ino differ
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/USB_ASCII/USB_ASCII.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/USB_ASCII/USB_ASCII.ino
index e38b176..a884978 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/USB_ASCII/USB_ASCII.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/USB_ASCII/USB_ASCII.ino
@@ -34,7 +34,7 @@ void setup() {
   pinMode(33, OUTPUT);
   Serial.begin();  // USB does not require BAUD
   // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink
diff --git a/STM32F1/libraries/A_STM32_Examples/examples/General/strtol_DecEquivalents/strtol_DecEquivalents.ino b/STM32F1/libraries/A_STM32_Examples/examples/General/strtol_DecEquivalents/strtol_DecEquivalents.ino
index 7d799af..f759471 100644
--- a/STM32F1/libraries/A_STM32_Examples/examples/General/strtol_DecEquivalents/strtol_DecEquivalents.ino
+++ b/STM32F1/libraries/A_STM32_Examples/examples/General/strtol_DecEquivalents/strtol_DecEquivalents.ino
@@ -19,7 +19,7 @@ void setup() {
   pinMode(33, OUTPUT);
   Serial.begin(9600);
   // wait for serial monitor to be connected.
-  while (!(Serial.isConnected() && (Serial.getDTR() || Serial.getRTS())))
+  while (!Serial)
   {
     digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
     delay(100);         // fast blink