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diff --git a/Example_Keyboards/Zenith Supersport/Zenith_Supersport_RevC.ino b/Example_Keyboards/Zenith Supersport/Zenith_Supersport_RevC.ino
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+/* Copyright 2020 Frank Adams
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+       http://www.apache.org/licenses/LICENSE-2.0
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+// This software makes a Zenith Supersport SX keyboard into a USB keyboard
+//
+// Revision History
+// Initial Release July 7, 2020  
+// Rev A July 11, 2020 - Disabled Num and Pad Lock matrix for debug
+// Rev B July 12, 2020 - Fixed normal matrix first row but left num/pad lock disabled
+// Rev C July 12, 2020 - Enabled num/pad lock 
+//
+#define MODIFIERKEY_FN 0x8f   // give Fn key a fake HID code 
+#define KEY_PAD_LOCK 0x8e     // give Pad Lock key a fake HID code
+#define CAPS_LED 17 // Teensy I/O's connected to keyboard LEDs thru resistors
+#define NUM_LED 5
+#define SCRL_LED 16
+#define PAD_LED 21
+#define HEARTBEAT_LED 13 // LED ON Teensy set to blink
+//
+const byte rows_max = 10; // sets the number of rows in the keyboard matrix
+const byte cols_max = 8; // sets the number of columns in the keyboard matrix
+//
+// Load the normal key matrix with the Teensyduino key names 
+// described at www.pjrc.com/teensy/td_keyboard.html 
+// A zero indicates no normal key at that location.
+int normal[rows_max][cols_max] = {
+  {KEY_BACKSLASH,KEY_BACKSPACE,KEY_DELETE,KEY_INSERT,KEY_PAUSE,KEY_NUM_LOCK,KEY_F10,KEY_F9},
+  {KEY_ENTER,KEY_PRINTSCREEN,KEY_EQUAL,KEY_MINUS,KEY_0,KEY_9,KEY_8,KEY_F8},
+  {KEY_RIGHT_BRACE,KEY_LEFT_BRACE,KEY_P,KEY_O,KEY_I,KEY_U,KEY_7,KEY_F7},
+  {KEY_QUOTE,KEY_SEMICOLON,KEY_L,KEY_K,KEY_J,KEY_Y,KEY_6,KEY_F6},
+  {KEY_SLASH,KEY_PERIOD,KEY_COMMA,KEY_M,KEY_H,KEY_T,KEY_5,KEY_F5},
+  {0,0,0,KEY_N,KEY_G,KEY_R,KEY_4,KEY_F4},
+  {KEY_RIGHT,KEY_LEFT,KEY_UP,KEY_B,KEY_F,KEY_E,KEY_3,KEY_F3},
+  {KEY_DOWN,0,KEY_SPACE,KEY_V,KEY_D,KEY_W,KEY_2,KEY_F2},
+  {0,KEY_C,KEY_X,KEY_S,KEY_A,KEY_Q,KEY_1,KEY_F1},
+  {0,KEY_CAPS_LOCK,KEY_Z,0,0,KEY_TAB,KEY_TILDE,KEY_ESC}
+};
+// Load the numlock key matrix with key names at the correct row-column location. 
+// This matrix is the same as the normal matrix except for the number pad keys
+// A zero indicates no numlock key at that location.
+int numlock[rows_max][cols_max] = {
+  {KEY_BACKSLASH,KEY_BACKSPACE,KEY_DELETE,KEY_INSERT,KEY_PAUSE,KEY_NUM_LOCK,KEY_F10,KEY_F9},
+  {KEYPAD_ENTER,KEY_PRINTSCREEN,KEY_EQUAL,KEY_MINUS,KEYPAD_MINUS,KEYPAD_9,KEYPAD_8,KEY_F8},
+  {KEY_RIGHT_BRACE,KEY_LEFT_BRACE,KEYPAD_PLUS,KEYPAD_6,KEYPAD_5,KEYPAD_4,KEYPAD_7,KEY_F7},
+  {KEY_QUOTE,KEYPAD_ASTERIX,KEYPAD_3,KEYPAD_2,KEYPAD_1,KEY_Y,KEY_6,KEY_F6},
+  {KEYPAD_SLASH,KEYPAD_PERIOD,KEY_COMMA,KEYPAD_0,KEY_H,KEY_T,KEY_5,KEY_F5},
+  {0,0,0,KEY_N,KEY_G,KEY_R,KEY_4,KEY_F4},
+  {KEY_RIGHT,KEY_LEFT,KEY_UP,KEY_B,KEY_F,KEY_E,KEY_3,KEY_F3},
+  {KEY_DOWN,0,KEY_SPACE,KEY_V,KEY_D,KEY_W,KEY_2,KEY_F2},
+  {0,KEY_C,KEY_X,KEY_S,KEY_A,KEY_Q,KEY_1,KEY_F1},
+  {0,KEY_CAPS_LOCK,KEY_Z,0,0,KEY_TAB,KEY_TILDE,KEY_ESC}
+};
+// Load the padlock key matrix with key names at the correct row-column location. 
+// This matrix is the same as the normal matrix except for the alternate number pad keys
+// A zero indicates no numlock key at that location.
+int padlock[rows_max][cols_max] = {
+  {KEY_BACKSLASH,KEY_BACKSPACE,KEY_DELETE,KEY_INSERT,KEY_PAUSE,KEY_NUM_LOCK,KEY_F10,KEY_F9},
+  {KEYPAD_ENTER,KEY_PRINTSCREEN,KEY_EQUAL,KEY_MINUS,KEYPAD_MINUS,KEY_PAGE_UP,KEY_UP,KEY_F8},
+  {KEY_RIGHT_BRACE,KEY_LEFT_BRACE,KEYPAD_PLUS,KEY_RIGHT,0,KEY_LEFT,KEY_HOME,KEY_F7},
+  {KEY_QUOTE,KEYPAD_ASTERIX,KEY_PAGE_DOWN,KEY_DOWN,KEY_END,KEY_Y,KEY_6,KEY_F6},
+  {KEYPAD_SLASH,KEY_DELETE,0,KEY_INSERT,KEY_H,KEY_T,KEY_5,KEY_F5},
+  {0,0,0,KEY_N,KEY_G,KEY_R,KEY_4,KEY_F4},
+  {KEY_RIGHT,KEY_LEFT,KEY_UP,KEY_B,KEY_F,KEY_E,KEY_3,KEY_F3},
+  {KEY_DOWN,0,KEY_SPACE,KEY_V,KEY_D,KEY_W,KEY_2,KEY_F2},
+  {0,KEY_C,KEY_X,KEY_S,KEY_A,KEY_Q,KEY_1,KEY_F1},
+  {0,KEY_CAPS_LOCK,KEY_Z,0,0,KEY_TAB,KEY_TILDE,KEY_ESC}
+};
+// Load the modifier key matrix with key names at the correct row-column location. 
+// A zero indicates no modifier key at that location.
+int modifier[rows_max][cols_max] = {
+  {0,0,0,0,0,0,0,0},
+  {0,0,0,0,0,0,0,0},
+  {0,0,0,0,0,0,0,0},
+  {0,0,0,0,0,0,0,0},
+  {0,0,0,0,0,0,0,0},
+  {MODIFIERKEY_RIGHT_SHIFT,MODIFIERKEY_RIGHT_CTRL,MODIFIERKEY_RIGHT_ALT,0,0,0,0,0},
+  {0,0,0,0,0,0,0,0},
+  {0,0,0,0,0,0,0,0},
+  {MODIFIERKEY_LEFT_ALT,0,0,0,0,0,0,0},
+  {MODIFIERKEY_FN,0,0,MODIFIERKEY_LEFT_SHIFT,MODIFIERKEY_LEFT_CTRL,0,0,0}  
+};
+// Load the media key matrix with Fn key names at the correct row-column location. 
+// A zero indicates no media key at that location. 
+int media[rows_max][cols_max] = {
+  {0,KEY_SCROLL_LOCK,0,0,0,KEY_PAD_LOCK,0,0},
+  {0,KEY_SYSTEM_WAKE_UP,0,0,0,0,0,0},
+  {0,KEY_HOME,0,0,0,0,0,0},
+  {0,0,0,0,0,0,0,0},
+  {0,0,0,0,0,0,0,0},
+  {0,0,0,0,0,0,0,0},
+  {KEY_END,0,KEY_PAGE_UP,0,0,0,0,0},
+  {KEY_PAGE_DOWN,0,0,0,0,0,0,KEY_F12},
+  {0,0,0,0,0,0,0,KEY_F11},
+  {0,0,0,0,0,0,0,0}
+};
+// Initialize the old_key matrix with one's (nothing pressed). 
+// 1 = key not pressed, 0 = key is pressed
+boolean old_key[rows_max][cols_max] = {
+  {1,1,1,1,1,1,1,1},
+  {1,1,1,1,1,1,1,1},
+  {1,1,1,1,1,1,1,1},
+  {1,1,1,1,1,1,1,1},
+  {1,1,1,1,1,1,1,1},
+  {1,1,1,1,1,1,1,1},
+  {1,1,1,1,1,1,1,1},
+  {1,1,1,1,1,1,1,1},
+  {1,1,1,1,1,1,1,1},
+  {1,1,1,1,1,1,1,1}
+};
+//
+// Assign the Teensy I/O row numbers
+int Row_IO[rows_max] = {6,19,20,4,25,3,2,1,22,0}; 
+//
+// Assign the column I/O numbers
+int Col_IO[cols_max] = {12,11,10,15,9,8,7,18}; 
+//
+// declare keyboard variables
+boolean slots_full = LOW; // Goes high when slots 1 thru 6 contain normal keys
+// slot 1 thru slot 6 hold the normal key values to be sent over USB. 
+int slot1 = 0; //value of 0 means the slot is empty and can be used.  
+int slot2 = 0; 
+int slot3 = 0; 
+int slot4 = 0; 
+int slot5 = 0; 
+int slot6 = 0;
+//
+int mod_shift_l = 0; // These variables are sent over USB as modifier keys.
+int mod_shift_r = 0; // Each is either set to 0 or MODIFIER_ ... 
+int mod_ctrl_l = 0;   
+int mod_ctrl_r = 0;
+int mod_alt_l = 0;
+int mod_alt_r = 0;
+int mod_gui = 0;
+//
+// Function to load the key name into the first available slot
+void load_slot(int key) {
+  if (!slot1)  {
+    slot1 = key;
+  }
+  else if (!slot2) {
+    slot2 = key;
+  }
+  else if (!slot3) {
+    slot3 = key;
+  }
+  else if (!slot4) {
+    slot4 = key;
+  }
+  else if (!slot5) {
+    slot5 = key;
+  }
+  else if (!slot6) {
+    slot6 = key;
+  }
+  if (!slot1 || !slot2 || !slot3 || !slot4 || !slot5 || !slot6)  {
+    slots_full = LOW; // slots are not full
+  }
+  else {
+    slots_full = HIGH; // slots are full
+  } 
+}
+//
+// Function to clear the slot that contains the key name
+void clear_slot(int key) {
+  if (slot1 == key) {
+    slot1 = 0;
+  }
+  else if (slot2 == key) {
+    slot2 = 0;
+  }
+  else if (slot3 == key) {
+    slot3 = 0;
+  }
+  else if (slot4 == key) {
+    slot4 = 0;
+  }
+  else if (slot5 == key) {
+    slot5 = 0;
+  }
+  else if (slot6 == key) {
+    slot6 = 0;
+  }
+  if (!slot1 || !slot2 || !slot3 || !slot4 || !slot5 || !slot6)  {
+    slots_full = LOW; // slots are not full
+  }
+  else {
+    slots_full = HIGH; // slots are full
+  } 
+}
+//
+// Function to load the modifier key name into the appropriate mod variable
+void load_mod(int m_key) {
+  if (m_key == MODIFIERKEY_LEFT_SHIFT)  {
+    mod_shift_l = m_key;
+  }
+  else if (m_key == MODIFIERKEY_RIGHT_SHIFT)  {
+    mod_shift_r = m_key;
+  }
+  else if (m_key == MODIFIERKEY_LEFT_CTRL)  {
+    mod_ctrl_l = m_key;
+  }
+  else if (m_key == MODIFIERKEY_RIGHT_CTRL)  {
+    mod_ctrl_r = m_key;
+  }
+  else if (m_key == MODIFIERKEY_LEFT_ALT)  {
+    mod_alt_l = m_key;
+  }
+  else if (m_key == MODIFIERKEY_RIGHT_ALT)  {
+    mod_alt_r = m_key;
+  }
+  else if (m_key == MODIFIERKEY_GUI)  {
+    mod_gui = m_key;
+  }
+}
+//
+// Function to load 0 into the appropriate mod variable
+void clear_mod(int m_key) {
+  if (m_key == MODIFIERKEY_LEFT_SHIFT)  {
+    mod_shift_l = 0;
+  }
+  else if (m_key == MODIFIERKEY_RIGHT_SHIFT)  {
+    mod_shift_r = 0;
+  }
+  else if (m_key == MODIFIERKEY_LEFT_CTRL)  {
+    mod_ctrl_l = 0;
+  }
+  else if (m_key == MODIFIERKEY_RIGHT_CTRL)  {
+    mod_ctrl_r = 0;
+  }
+  else if (m_key == MODIFIERKEY_LEFT_ALT)  {
+    mod_alt_l = 0;
+  }
+  else if (m_key == MODIFIERKEY_RIGHT_ALT)  {
+    mod_alt_r = 0;
+  }
+  else if (m_key == MODIFIERKEY_GUI)  {
+    mod_gui = 0;
+  }
+}
+//
+// Function to send the modifier keys over usb
+void send_mod() {
+  Keyboard.set_modifier(mod_shift_l | mod_shift_r | mod_ctrl_l | mod_ctrl_r | mod_alt_l | mod_alt_r | mod_gui);
+  Keyboard.send_now();
+}
+//
+// Function to send the normal keys in the 6 slots over usb
+void send_normals() {
+  Keyboard.set_key1(slot1);
+  Keyboard.set_key2(slot2);
+  Keyboard.set_key3(slot3);
+  Keyboard.set_key4(slot4);
+  Keyboard.set_key5(slot5);
+  Keyboard.set_key6(slot6);
+  Keyboard.send_now();
+}
+//
+// Function to set a pin to high impedance (acts like open drain output)
+void go_z(int pin)
+{
+  pinMode(pin, INPUT);
+  digitalWrite(pin, HIGH);
+}
+//
+// Function to set a pin as an input with a pullup
+void go_pu(int pin)
+{
+  pinMode(pin, INPUT_PULLUP);
+  digitalWrite(pin, HIGH);
+}
+//
+// Function to send a pin to a logic low
+void go_0(int pin)
+{
+  pinMode(pin, OUTPUT);
+  digitalWrite(pin, LOW);
+}
+//
+// Function to send a pin to a logic high
+void go_1(int pin)
+{
+  pinMode(pin, OUTPUT);
+  digitalWrite(pin, HIGH);
+}
+//
+//----------------------------------Setup-------------------------------------------
+void setup() {
+  for (int a = 0; a < cols_max; a++) {  // loop thru all column pins 
+    go_pu(Col_IO[a]); // set each column pin as an input with a pullup
+  }
+//
+  for (int b = 0; b < rows_max; b++) {  // loop thru all row pins 
+    go_z(Row_IO[b]); // set each row pin as a floating output
+  }  
+//
+  pinMode(HEARTBEAT_LED, OUTPUT); // drive the LED on the Teensy
+}
+//
+boolean pad_lock = HIGH; // Initialize the pad lock to HIGH = "not pressed"
+boolean Fn_pressed = HIGH; // Initialize Fn key to HIGH = "not pressed"
+extern volatile uint8_t keyboard_leds; // 8 bits sent from host to Teensy that give keyboard LED status.
+char blink_count = 0; // heartbeat loop counter
+boolean blinky = LOW; // heartbeat LED state
+//
+//---------------------------------Main Loop---------------------------------------------
+//
+void loop() {   
+// Scan keyboard matrix with an outer loop that drives each row low and an inner loop that reads every column (with pull ups).
+// The routine looks at each key's present state (by reading the column input pin) and also the previous state from the last scan
+// that was 30msec ago. The status of a key that was just pressed or just released is sent over USB and the state is saved in the old_key matrix. 
+// The keyboard keys will read as logic low if they are pressed (negative logic).
+// The old_key matrix also uses negative logic (low=pressed). 
+//
+  for (int x = 0; x < rows_max; x++) {   // loop thru the rows
+    go_0(Row_IO[x]); // Activate Row (send it low)
+    delayMicroseconds(10); // give the row time to go low and settle out
+    for (int y = 0; y < cols_max; y++) {   // loop thru the columns
+// **********Modifier keys including the Fn special case
+      if (modifier[x][y] != 0) {  // check if modifier key exists at this location in the array (a non-zero value)
+        if (!digitalRead(Col_IO[y]) && (old_key[x][y])) {  // Read column to see if key is low (pressed) and was previously not pressed
+          if (modifier[x][y] != MODIFIERKEY_FN) {   // Exclude Fn modifier key  
+            load_mod(modifier[x][y]); // function reads which modifier key is pressed and loads it into the appropriate mod_... variable   
+            send_mod(); // function sends the state of all modifier keys over usb including the one that just got pressed
+            old_key[x][y] = LOW; // Save state of key as "pressed"
+          }
+          else {   
+            Fn_pressed = LOW; // Fn status variable is active low
+            old_key[x][y] = LOW; // old_key state is "pressed" (active low)
+          }
+        }
+        else if (digitalRead(Col_IO[y]) && (!old_key[x][y])) {  //check if key is not pressed and was previously pressed
+          if (modifier[x][y] != MODIFIERKEY_FN) { // Exclude Fn modifier key 
+            clear_mod(modifier[x][y]); // function reads which modifier key was released and loads 0 into the appropriate mod_... variable
+            send_mod(); // function sends all mod's over usb including the one that just released
+            old_key[x][y] = HIGH; // Save state of key as "not pressed"
+          }
+          else {
+            Fn_pressed = HIGH; // Fn is no longer active
+            old_key[x][y] = HIGH; // old_key state is "not pressed" 
+          }
+        }
+      } 
+// ***********end of modifier section
+//
+// ***********Normal keys, num lock keys, pad lock keys, and media keys in this section
+      else if ((normal[x][y] != 0) || (media[x][y] != 0)) {  // check if normal or media key exists at this location in the array
+        if (!digitalRead(Col_IO[y]) && (old_key[x][y]) && (!slots_full)) { // check if key pressed and not previously pressed and slots not full
+          old_key[x][y] = LOW; // Save state of key as "pressed"
+          if (Fn_pressed) {  // Fn_pressed is active low so it is not pressed and normal key needs to be sent
+            if (keyboard_leds & 1) {  // test if Num Lock is turned on
+              load_slot(numlock[x][y]); //update first available slot with key name from numlock matrix
+              send_normals(); // send all slots over USB including the key that just got pressed
+            }
+            else if (!pad_lock) {  // test if Pad Lock is turned on (Note that Num Lock takes precedence over Pad Lock)
+              load_slot(padlock[x][y]); //update first available slot with key name from padlock matrix
+              send_normals(); // send all slots over USB including the key that just got pressed   
+            }
+            else { // Num Lock and Pad Lock are not turned on so send normal key                        
+              load_slot(normal[x][y]); //update first available slot with key name from normal matrix
+              send_normals(); // send all slots over USB including the key that just got pressed
+            }
+          }
+          else if (media[x][y] != 0) { // Fn is pressed so send media if a key exists in the matrix
+            if (media[x][y] != KEY_PAD_LOCK) { // if it's not the pad lock key, send it over USB
+              Keyboard.press(media[x][y]); // media key is sent using keyboard press function per PJRC    
+              delay(5); // delay 5 milliseconds before releasing to make sure it gets sent over USB
+              Keyboard.release(media[x][y]); // send media key release
+            }
+            else { // pad lock key is pushed
+              pad_lock = !pad_lock; // toggle the pad_lock state
+            }
+          }
+        }          
+        else if (digitalRead(Col_IO[y]) && (!old_key[x][y])) { //check if key is not pressed, but was previously pressed 
+          old_key[x][y] = HIGH; // Save state of key as "not pressed"
+          if (Fn_pressed) {  // Fn is not pressed
+            if (keyboard_leds & 1) {  // test if Num Lock is turned on
+              clear_slot(numlock[x][y]); //clear slot with key name from numlock matrix
+              send_normals(); // send all slots over USB including the key that just got released
+            }
+            else if (!pad_lock) {  // test if Pad Lock is turned on
+              clear_slot(padlock[x][y]); //clear slot with key name from padlock matrix
+              send_normals(); // send all slots over USB including the key that just got released
+            }
+            else {
+              clear_slot(normal[x][y]); //clear slot with key name from normal matrix
+              send_normals(); // send all slots over USB including the key that just got released
+            }
+          }
+        }
+      } 
+// **************end of normal, num lock, and media key section 
+//
+    }
+    go_z(Row_IO[x]); // De-activate Row (send it to hi-z)
+  }
+//
+// **********keyboard scan complete*******************************
+//
+// Control the 3 keyboard LEDs
+//
+  if (keyboard_leds & 1<<1) {  // mask off all bits but D1 and test if set
+    go_0(CAPS_LED); // turn on the LED
+  }
+  else {
+    go_1(CAPS_LED); // turn off the LED
+  }
+//
+  if (keyboard_leds & 1) {  // mask off all bits but D0 and test if set
+    go_0(NUM_LED); // turn on the Num Lock LED
+  }
+  else {
+    go_1(NUM_LED); // turn off the Num Lock LED
+  }
+//
+  if (keyboard_leds & 1<<2) {  // mask off all bits but D2 and test if set
+    go_0(SCRL_LED); // turn on the Scroll Lock LED
+  }
+  else {
+    go_1(SCRL_LED); // turn off the Scroll Lock LED
+  }
+//
+  if (!pad_lock) {  // check if pad_lock variable is Low (active state)
+    go_0(PAD_LED); // turn on the Pad Lock LED
+  }
+  else {
+    go_1(PAD_LED); // turn off the Pad Lock LED
+  }
+//
+// Blink the LED on the Teensy to show a heartbeat
+//
+  if (blink_count >= 0x17) {  
+    digitalWrite(HEARTBEAT_LED, blinky);
+    blinky = !blinky;
+    blink_count = 0;
+  }
+  else {
+    blink_count = blink_count + 1;
+  }
+//
+  delay(24); // The overall keyboard/trackpoint scanning rate is about 30ms
+}