diff --git a/Marlin/MarlinSerial.cpp b/Marlin/MarlinSerial.cpp
index 38e1b51cf..2004d3657 100644
--- a/Marlin/MarlinSerial.cpp
+++ b/Marlin/MarlinSerial.cpp
@@ -33,495 +33,490 @@
 #include "stepper.h"
 #include "Marlin.h"
 
-#ifndef USBCON
-// this next line disables the entire HardwareSerial.cpp,
-// this is so I can support Attiny series and any other chip without a UART
-#if defined(UBRRH) || defined(UBRR0H) || defined(UBRR1H) || defined(UBRR2H) || defined(UBRR3H)
+// Disable HardwareSerial.cpp to support chips without a UART (Attiny, etc.)
 
-#if UART_PRESENT(SERIAL_PORT)
-  ring_buffer_r rx_buffer  =  { { 0 }, 0, 0 };
-  #if TX_BUFFER_SIZE > 0
-    ring_buffer_t tx_buffer  =  { { 0 }, 0, 0 };
-    static bool _written;
+#if !defined(USBCON) && (defined(UBRRH) || defined(UBRR0H) || defined(UBRR1H) || defined(UBRR2H) || defined(UBRR3H))
+
+  #if UART_PRESENT(SERIAL_PORT)
+    ring_buffer_r rx_buffer  =  { { 0 }, 0, 0 };
+    #if TX_BUFFER_SIZE > 0
+      ring_buffer_t tx_buffer  =  { { 0 }, 0, 0 };
+      static bool _written;
+    #endif
   #endif
-#endif
 
+  #if ENABLED(EMERGENCY_PARSER)
+
+    #include "language.h"
+
+    // Currently looking for: M108, M112, M410
+    // If you alter the parser please don't forget to update the capabilities in Conditionals_post.h
+
+    FORCE_INLINE void emergency_parser(const unsigned char c) {
+
+      static e_parser_state state = state_RESET;
 
-FORCE_INLINE void store_char(unsigned char c) {
-  CRITICAL_SECTION_START;
-    uint8_t h = rx_buffer.head;
-    uint8_t i = (uint8_t)(h + 1)  & (RX_BUFFER_SIZE - 1);
+      switch (state) {
+        case state_RESET:
+          switch (c) {
+            case ' ': break;
+            case 'N': state = state_N;      break;
+            case 'M': state = state_M;      break;
+            default: state = state_IGNORE;
+          }
+          break;
+
+        case state_N:
+          switch (c) {
+            case '0': case '1': case '2':
+            case '3': case '4': case '5':
+            case '6': case '7': case '8':
+            case '9': case '-': case ' ':   break;
+            case 'M': state = state_M;      break;
+            default:  state = state_IGNORE;
+          }
+          break;
+
+        case state_M:
+          switch (c) {
+            case ' ': break;
+            case '1': state = state_M1;     break;
+            case '4': state = state_M4;     break;
+            default: state = state_IGNORE;
+          }
+          break;
 
-    // if we should be storing the received character into the location
-    // just before the tail (meaning that the head would advance to the
-    // current location of the tail), we're about to overflow the buffer
-    // and so we don't write the character or advance the head.
-    if (i != rx_buffer.tail) {
-      rx_buffer.buffer[h] = c;
-      rx_buffer.head = i;
+        case state_M1:
+          switch (c) {
+            case '0': state = state_M10;    break;
+            case '1': state = state_M11;    break;
+            default: state = state_IGNORE;
+          }
+          break;
+
+        case state_M10:
+          state = (c == '8') ? state_M108 : state_IGNORE;
+          break;
+
+        case state_M11:
+          state = (c == '2') ? state_M112 : state_IGNORE;
+          break;
+
+        case state_M4:
+          state = (c == '1') ? state_M41 : state_IGNORE;
+          break;
+
+        case state_M41:
+          state = (c == '0') ? state_M410 : state_IGNORE;
+          break;
+
+        case state_IGNORE:
+          if (c == '\n') state = state_RESET;
+          break;
+
+        default:
+          if (c == '\n') {
+            switch (state) {
+              case state_M108:
+                wait_for_user = wait_for_heatup = false;
+                break;
+              case state_M112:
+                kill(PSTR(MSG_KILLED));
+                break;
+              case state_M410:
+                quickstop_stepper();
+                break;
+              default:
+                break;
+            }
+            state = state_RESET;
+          }
+      }
     }
-  CRITICAL_SECTION_END;
 
-  #if ENABLED(EMERGENCY_PARSER)
-    emergency_parser(c);
   #endif
-}
 
-#if TX_BUFFER_SIZE > 0
 
-  FORCE_INLINE void _tx_udr_empty_irq(void) {
-    // If interrupts are enabled, there must be more data in the output
-    // buffer. Send the next byte
-    uint8_t t = tx_buffer.tail;
-    uint8_t c = tx_buffer.buffer[t];
-    tx_buffer.tail = (t + 1) & (TX_BUFFER_SIZE - 1);
+  FORCE_INLINE void store_char(unsigned char c) {
+    CRITICAL_SECTION_START;
+      uint8_t h = rx_buffer.head;
+      uint8_t i = (uint8_t)(h + 1)  & (RX_BUFFER_SIZE - 1);
+
+      // if we should be storing the received character into the location
+      // just before the tail (meaning that the head would advance to the
+      // current location of the tail), we're about to overflow the buffer
+      // and so we don't write the character or advance the head.
+      if (i != rx_buffer.tail) {
+        rx_buffer.buffer[h] = c;
+        rx_buffer.head = i;
+      }
+    CRITICAL_SECTION_END;
 
-    M_UDRx = c;
+    #if ENABLED(EMERGENCY_PARSER)
+      emergency_parser(c);
+    #endif
+  }
 
-    // clear the TXC bit -- "can be cleared by writing a one to its bit
-    // location". This makes sure flush() won't return until the bytes
-    // actually got written
-    SBI(M_UCSRxA, M_TXCx);
+  #if TX_BUFFER_SIZE > 0
 
-    if (tx_buffer.head == tx_buffer.tail) {
-      // Buffer empty, so disable interrupts
-      CBI(M_UCSRxB, M_UDRIEx);
-    }
-  }
+    FORCE_INLINE void _tx_udr_empty_irq(void) {
+      // If interrupts are enabled, there must be more data in the output
+      // buffer. Send the next byte
+      uint8_t t = tx_buffer.tail;
+      uint8_t c = tx_buffer.buffer[t];
+      tx_buffer.tail = (t + 1) & (TX_BUFFER_SIZE - 1);
 
-  #ifdef M_USARTx_UDRE_vect
-    ISR(M_USARTx_UDRE_vect) {
-      _tx_udr_empty_irq();
+      M_UDRx = c;
+
+      // clear the TXC bit -- "can be cleared by writing a one to its bit
+      // location". This makes sure flush() won't return until the bytes
+      // actually got written
+      SBI(M_UCSRxA, M_TXCx);
+
+      if (tx_buffer.head == tx_buffer.tail) {
+        // Buffer empty, so disable interrupts
+        CBI(M_UCSRxB, M_UDRIEx);
+      }
     }
-  #endif
 
-#endif // TX_BUFFER_SIZE
+    #ifdef M_USARTx_UDRE_vect
+      ISR(M_USARTx_UDRE_vect) {
+        _tx_udr_empty_irq();
+      }
+    #endif
 
-#ifdef M_USARTx_RX_vect
-  ISR(M_USARTx_RX_vect) {
-    unsigned char c  =  M_UDRx;
-    store_char(c);
-  }
-#endif
+  #endif // TX_BUFFER_SIZE
 
-// Constructors ////////////////////////////////////////////////////////////////
+  #ifdef M_USARTx_RX_vect
+    ISR(M_USARTx_RX_vect) {
+      unsigned char c  =  M_UDRx;
+      store_char(c);
+    }
+  #endif
 
-MarlinSerial::MarlinSerial() { }
+  // Public Methods
 
-// Public Methods //////////////////////////////////////////////////////////////
+  void MarlinSerial::begin(long baud) {
+    uint16_t baud_setting;
+    bool useU2X = true;
 
-void MarlinSerial::begin(long baud) {
-  uint16_t baud_setting;
-  bool useU2X = true;
+    #if F_CPU == 16000000UL && SERIAL_PORT == 0
+      // hard-coded exception for compatibility with the bootloader shipped
+      // with the Duemilanove and previous boards and the firmware on the 8U2
+      // on the Uno and Mega 2560.
+      if (baud == 57600) {
+        useU2X = false;
+      }
+    #endif
 
-  #if F_CPU == 16000000UL && SERIAL_PORT == 0
-    // hard-coded exception for compatibility with the bootloader shipped
-    // with the Duemilanove and previous boards and the firmware on the 8U2
-    // on the Uno and Mega 2560.
-    if (baud == 57600) {
-      useU2X = false;
+    if (useU2X) {
+      M_UCSRxA = _BV(M_U2Xx);
+      baud_setting = (F_CPU / 4 / baud - 1) / 2;
+    }
+    else {
+      M_UCSRxA = 0;
+      baud_setting = (F_CPU / 8 / baud - 1) / 2;
     }
-  #endif
 
-  if (useU2X) {
-    M_UCSRxA = _BV(M_U2Xx);
-    baud_setting = (F_CPU / 4 / baud - 1) / 2;
-  }
-  else {
-    M_UCSRxA = 0;
-    baud_setting = (F_CPU / 8 / baud - 1) / 2;
-  }
+    // assign the baud_setting, a.k.a. ubbr (USART Baud Rate Register)
+    M_UBRRxH = baud_setting >> 8;
+    M_UBRRxL = baud_setting;
 
-  // assign the baud_setting, a.k.a. ubbr (USART Baud Rate Register)
-  M_UBRRxH = baud_setting >> 8;
-  M_UBRRxL = baud_setting;
+    SBI(M_UCSRxB, M_RXENx);
+    SBI(M_UCSRxB, M_TXENx);
+    SBI(M_UCSRxB, M_RXCIEx);
+    #if TX_BUFFER_SIZE > 0
+      CBI(M_UCSRxB, M_UDRIEx);
+      _written = false;
+    #endif
+  }
 
-  SBI(M_UCSRxB, M_RXENx);
-  SBI(M_UCSRxB, M_TXENx);
-  SBI(M_UCSRxB, M_RXCIEx);
-  #if TX_BUFFER_SIZE > 0
+  void MarlinSerial::end() {
+    CBI(M_UCSRxB, M_RXENx);
+    CBI(M_UCSRxB, M_TXENx);
+    CBI(M_UCSRxB, M_RXCIEx);
     CBI(M_UCSRxB, M_UDRIEx);
-    _written = false;
-  #endif
-}
-
-void MarlinSerial::end() {
-  CBI(M_UCSRxB, M_RXENx);
-  CBI(M_UCSRxB, M_TXENx);
-  CBI(M_UCSRxB, M_RXCIEx);
-  CBI(M_UCSRxB, M_UDRIEx);
-}
-
-void MarlinSerial::checkRx(void) {
-  if (TEST(M_UCSRxA, M_RXCx)) {
-    uint8_t c  =  M_UDRx;
-    store_char(c);
   }
-}
-
-int MarlinSerial::peek(void) {
-  CRITICAL_SECTION_START;
-    int v = rx_buffer.head == rx_buffer.tail ? -1 : rx_buffer.buffer[rx_buffer.tail];
-  CRITICAL_SECTION_END;
-  return v;
-}
-
-int MarlinSerial::read(void) {
-  int v;
-  CRITICAL_SECTION_START;
-    uint8_t t = rx_buffer.tail;
-    if (rx_buffer.head == t) {
-      v = -1;
-    }
-    else {
-      v = rx_buffer.buffer[t];
-      rx_buffer.tail = (uint8_t)(t + 1) & (RX_BUFFER_SIZE - 1);
+
+  void MarlinSerial::checkRx(void) {
+    if (TEST(M_UCSRxA, M_RXCx)) {
+      uint8_t c  =  M_UDRx;
+      store_char(c);
     }
-  CRITICAL_SECTION_END;
-  return v;
-}
-
-uint8_t MarlinSerial::available(void) {
-  CRITICAL_SECTION_START;
-    uint8_t h = rx_buffer.head,
-            t = rx_buffer.tail;
-  CRITICAL_SECTION_END;
-  return (uint8_t)(RX_BUFFER_SIZE + h - t) & (RX_BUFFER_SIZE - 1);
-}
-
-void MarlinSerial::flush(void) {
-  // RX
-  // don't reverse this or there may be problems if the RX interrupt
-  // occurs after reading the value of rx_buffer_head but before writing
-  // the value to rx_buffer_tail; the previous value of rx_buffer_head
-  // may be written to rx_buffer_tail, making it appear as if the buffer
-  // were full, not empty.
-  CRITICAL_SECTION_START;
-    rx_buffer.head = rx_buffer.tail;
-  CRITICAL_SECTION_END;
-}
-
-#if TX_BUFFER_SIZE > 0
-  uint8_t MarlinSerial::availableForWrite(void) {
+  }
+
+  int MarlinSerial::peek(void) {
     CRITICAL_SECTION_START;
-      uint8_t h = tx_buffer.head;
-      uint8_t t = tx_buffer.tail;
+      int v = rx_buffer.head == rx_buffer.tail ? -1 : rx_buffer.buffer[rx_buffer.tail];
+    CRITICAL_SECTION_END;
+    return v;
+  }
+
+  int MarlinSerial::read(void) {
+    int v;
+    CRITICAL_SECTION_START;
+      uint8_t t = rx_buffer.tail;
+      if (rx_buffer.head == t) {
+        v = -1;
+      }
+      else {
+        v = rx_buffer.buffer[t];
+        rx_buffer.tail = (uint8_t)(t + 1) & (RX_BUFFER_SIZE - 1);
+      }
     CRITICAL_SECTION_END;
-    return (uint8_t)(TX_BUFFER_SIZE + h - t) & (TX_BUFFER_SIZE - 1);
+    return v;
   }
 
-  void MarlinSerial::write(uint8_t c) {
-    _written = true;
+  uint8_t MarlinSerial::available(void) {
     CRITICAL_SECTION_START;
-      bool emty = (tx_buffer.head == tx_buffer.tail);
+      uint8_t h = rx_buffer.head,
+              t = rx_buffer.tail;
     CRITICAL_SECTION_END;
-    // If the buffer and the data register is empty, just write the byte
-    // to the data register and be done. This shortcut helps
-    // significantly improve the effective datarate at high (>
-    // 500kbit/s) bitrates, where interrupt overhead becomes a slowdown.
-    if (emty && TEST(M_UCSRxA, M_UDREx)) {
+    return (uint8_t)(RX_BUFFER_SIZE + h - t) & (RX_BUFFER_SIZE - 1);
+  }
+
+  void MarlinSerial::flush(void) {
+    // RX
+    // don't reverse this or there may be problems if the RX interrupt
+    // occurs after reading the value of rx_buffer_head but before writing
+    // the value to rx_buffer_tail; the previous value of rx_buffer_head
+    // may be written to rx_buffer_tail, making it appear as if the buffer
+    // were full, not empty.
+    CRITICAL_SECTION_START;
+      rx_buffer.head = rx_buffer.tail;
+    CRITICAL_SECTION_END;
+  }
+
+  #if TX_BUFFER_SIZE > 0
+    uint8_t MarlinSerial::availableForWrite(void) {
       CRITICAL_SECTION_START;
-        M_UDRx = c;
-        SBI(M_UCSRxA, M_TXCx);
+        uint8_t h = tx_buffer.head;
+        uint8_t t = tx_buffer.tail;
       CRITICAL_SECTION_END;
-      return;
-    }
-    uint8_t i = (tx_buffer.head + 1) & (TX_BUFFER_SIZE - 1);
-
-    // If the output buffer is full, there's nothing for it other than to
-    // wait for the interrupt handler to empty it a bit
-    while (i == tx_buffer.tail) {
-      if (!TEST(SREG, SREG_I)) {
-        // Interrupts are disabled, so we'll have to poll the data
-        // register empty flag ourselves. If it is set, pretend an
-        // interrupt has happened and call the handler to free up
-        // space for us.
-        if (TEST(M_UCSRxA, M_UDREx))
-          _tx_udr_empty_irq();
-      } else {
-        // nop, the interrupt handler will free up space for us
-      }
+      return (uint8_t)(TX_BUFFER_SIZE + h - t) & (TX_BUFFER_SIZE - 1);
     }
 
-    tx_buffer.buffer[tx_buffer.head] = c;
-    { CRITICAL_SECTION_START;
-        tx_buffer.head = i;
-        SBI(M_UCSRxB, M_UDRIEx);
+    void MarlinSerial::write(uint8_t c) {
+      _written = true;
+      CRITICAL_SECTION_START;
+        bool emty = (tx_buffer.head == tx_buffer.tail);
       CRITICAL_SECTION_END;
-    }
-    return;
-  }
+      // If the buffer and the data register is empty, just write the byte
+      // to the data register and be done. This shortcut helps
+      // significantly improve the effective datarate at high (>
+      // 500kbit/s) bitrates, where interrupt overhead becomes a slowdown.
+      if (emty && TEST(M_UCSRxA, M_UDREx)) {
+        CRITICAL_SECTION_START;
+          M_UDRx = c;
+          SBI(M_UCSRxA, M_TXCx);
+        CRITICAL_SECTION_END;
+        return;
+      }
+      uint8_t i = (tx_buffer.head + 1) & (TX_BUFFER_SIZE - 1);
+
+      // If the output buffer is full, there's nothing for it other than to
+      // wait for the interrupt handler to empty it a bit
+      while (i == tx_buffer.tail) {
+        if (!TEST(SREG, SREG_I)) {
+          // Interrupts are disabled, so we'll have to poll the data
+          // register empty flag ourselves. If it is set, pretend an
+          // interrupt has happened and call the handler to free up
+          // space for us.
+          if (TEST(M_UCSRxA, M_UDREx))
+            _tx_udr_empty_irq();
+        } else {
+          // nop, the interrupt handler will free up space for us
+        }
+      }
 
-  void MarlinSerial::flushTX(void) {
-    // TX
-    // If we have never written a byte, no need to flush. This special
-    // case is needed since there is no way to force the TXC (transmit
-    // complete) bit to 1 during initialization
-    if (!_written)
+      tx_buffer.buffer[tx_buffer.head] = c;
+      { CRITICAL_SECTION_START;
+          tx_buffer.head = i;
+          SBI(M_UCSRxB, M_UDRIEx);
+        CRITICAL_SECTION_END;
+      }
       return;
-
-    while (TEST(M_UCSRxB, M_UDRIEx) || !TEST(M_UCSRxA, M_TXCx)) {
-      if (!TEST(SREG, SREG_I) && TEST(M_UCSRxB, M_UDRIEx))
-        // Interrupts are globally disabled, but the DR empty
-        // interrupt should be enabled, so poll the DR empty flag to
-        // prevent deadlock
-        if (TEST(M_UCSRxA, M_UDREx))
-          _tx_udr_empty_irq();
     }
-    // If we get here, nothing is queued anymore (DRIE is disabled) and
-    // the hardware finished tranmission (TXC is set).
-}
-
-#else
-  void MarlinSerial::write(uint8_t c) {
-    while (!TEST(M_UCSRxA, M_UDREx))
-      ;
-    M_UDRx = c;
+
+    void MarlinSerial::flushTX(void) {
+      // TX
+      // If we have never written a byte, no need to flush. This special
+      // case is needed since there is no way to force the TXC (transmit
+      // complete) bit to 1 during initialization
+      if (!_written)
+        return;
+
+      while (TEST(M_UCSRxB, M_UDRIEx) || !TEST(M_UCSRxA, M_TXCx)) {
+        if (!TEST(SREG, SREG_I) && TEST(M_UCSRxB, M_UDRIEx))
+          // Interrupts are globally disabled, but the DR empty
+          // interrupt should be enabled, so poll the DR empty flag to
+          // prevent deadlock
+          if (TEST(M_UCSRxA, M_UDREx))
+            _tx_udr_empty_irq();
+      }
+      // If we get here, nothing is queued anymore (DRIE is disabled) and
+      // the hardware finished tranmission (TXC is set).
   }
-#endif
 
-// end NEW
+  #else
+    void MarlinSerial::write(uint8_t c) {
+      while (!TEST(M_UCSRxA, M_UDREx))
+        ;
+      M_UDRx = c;
+    }
+  #endif
 
-/// imports from print.h
+  // end NEW
 
+  /// imports from print.h
 
-void MarlinSerial::print(char c, int base) {
-  print((long) c, base);
-}
 
-void MarlinSerial::print(unsigned char b, int base) {
-  print((unsigned long) b, base);
-}
+  void MarlinSerial::print(char c, int base) {
+    print((long) c, base);
+  }
 
-void MarlinSerial::print(int n, int base) {
-  print((long) n, base);
-}
+  void MarlinSerial::print(unsigned char b, int base) {
+    print((unsigned long) b, base);
+  }
 
-void MarlinSerial::print(unsigned int n, int base) {
-  print((unsigned long) n, base);
-}
+  void MarlinSerial::print(int n, int base) {
+    print((long) n, base);
+  }
 
-void MarlinSerial::print(long n, int base) {
-  if (base == 0) {
-    write(n);
+  void MarlinSerial::print(unsigned int n, int base) {
+    print((unsigned long) n, base);
   }
-  else if (base == 10) {
-    if (n < 0) {
-      print('-');
-      n = -n;
+
+  void MarlinSerial::print(long n, int base) {
+    if (base == 0) {
+      write(n);
+    }
+    else if (base == 10) {
+      if (n < 0) {
+        print('-');
+        n = -n;
+      }
+      printNumber(n, 10);
+    }
+    else {
+      printNumber(n, base);
     }
-    printNumber(n, 10);
   }
-  else {
-    printNumber(n, base);
+
+  void MarlinSerial::print(unsigned long n, int base) {
+    if (base == 0) write(n);
+    else printNumber(n, base);
   }
-}
-
-void MarlinSerial::print(unsigned long n, int base) {
-  if (base == 0) write(n);
-  else printNumber(n, base);
-}
-
-void MarlinSerial::print(double n, int digits) {
-  printFloat(n, digits);
-}
-
-void MarlinSerial::println(void) {
-  print('\r');
-  print('\n');
-}
-
-void MarlinSerial::println(const String& s) {
-  print(s);
-  println();
-}
-
-void MarlinSerial::println(const char c[]) {
-  print(c);
-  println();
-}
-
-void MarlinSerial::println(char c, int base) {
-  print(c, base);
-  println();
-}
-
-void MarlinSerial::println(unsigned char b, int base) {
-  print(b, base);
-  println();
-}
-
-void MarlinSerial::println(int n, int base) {
-  print(n, base);
-  println();
-}
-
-void MarlinSerial::println(unsigned int n, int base) {
-  print(n, base);
-  println();
-}
-
-void MarlinSerial::println(long n, int base) {
-  print(n, base);
-  println();
-}
-
-void MarlinSerial::println(unsigned long n, int base) {
-  print(n, base);
-  println();
-}
-
-void MarlinSerial::println(double n, int digits) {
-  print(n, digits);
-  println();
-}
-
-// Private Methods /////////////////////////////////////////////////////////////
-
-void MarlinSerial::printNumber(unsigned long n, uint8_t base) {
-  if (n) {
-    unsigned char buf[8 * sizeof(long)]; // Enough space for base 2
-    int8_t i = 0;
-    while (n) {
-      buf[i++] = n % base;
-      n /= base;
-    }
-    while (i--)
-      print((char)(buf[i] + (buf[i] < 10 ? '0' : 'A' - 10)));
+
+  void MarlinSerial::print(double n, int digits) {
+    printFloat(n, digits);
   }
-  else
-    print('0');
-}
-
-void MarlinSerial::printFloat(double number, uint8_t digits) {
-  // Handle negative numbers
-  if (number < 0.0) {
-    print('-');
-    number = -number;
+
+  void MarlinSerial::println(void) {
+    print('\r');
+    print('\n');
   }
 
-  // Round correctly so that print(1.999, 2) prints as "2.00"
-  double rounding = 0.5;
-  for (uint8_t i = 0; i < digits; ++i)
-    rounding *= 0.1;
-
-  number += rounding;
-
-  // Extract the integer part of the number and print it
-  unsigned long int_part = (unsigned long)number;
-  double remainder = number - (double)int_part;
-  print(int_part);
-
-  // Print the decimal point, but only if there are digits beyond
-  if (digits) {
-    print('.');
-    // Extract digits from the remainder one at a time
-    while (digits--) {
-      remainder *= 10.0;
-      int toPrint = int(remainder);
-      print(toPrint);
-      remainder -= toPrint;
-    }
+  void MarlinSerial::println(const String& s) {
+    print(s);
+    println();
   }
-}
-// Preinstantiate Objects //////////////////////////////////////////////////////
 
+  void MarlinSerial::println(const char c[]) {
+    print(c);
+    println();
+  }
 
-MarlinSerial customizedSerial;
+  void MarlinSerial::println(char c, int base) {
+    print(c, base);
+    println();
+  }
 
-#endif // whole file
-#endif // !USBCON
+  void MarlinSerial::println(unsigned char b, int base) {
+    print(b, base);
+    println();
+  }
 
-// For AT90USB targets use the UART for BT interfacing
-#if defined(USBCON) && ENABLED(BLUETOOTH)
-  HardwareSerial bluetoothSerial;
-#endif
+  void MarlinSerial::println(int n, int base) {
+    print(n, base);
+    println();
+  }
 
-#if ENABLED(EMERGENCY_PARSER)
+  void MarlinSerial::println(unsigned int n, int base) {
+    print(n, base);
+    println();
+  }
 
-  // Currently looking for: M108, M112, M410
-  // If you alter the parser please don't forget to update the capabilities in Conditionals_post.h
+  void MarlinSerial::println(long n, int base) {
+    print(n, base);
+    println();
+  }
 
-  FORCE_INLINE void emergency_parser(unsigned char c) {
+  void MarlinSerial::println(unsigned long n, int base) {
+    print(n, base);
+    println();
+  }
 
-    static e_parser_state state = state_RESET;
+  void MarlinSerial::println(double n, int digits) {
+    print(n, digits);
+    println();
+  }
 
-    switch (state) {
-      case state_RESET:
-        switch (c) {
-          case ' ': break;
-          case 'N': state = state_N;      break;
-          case 'M': state = state_M;      break;
-          default: state = state_IGNORE;
-        }
-        break;
-
-      case state_N:
-        switch (c) {
-          case '0': case '1': case '2':
-          case '3': case '4': case '5':
-          case '6': case '7': case '8':
-          case '9': case '-': case ' ':   break;
-          case 'M': state = state_M;      break;
-          default:  state = state_IGNORE;
-        }
-        break;
-
-      case state_M:
-        switch (c) {
-          case ' ': break;
-          case '1': state = state_M1;     break;
-          case '4': state = state_M4;     break;
-          default: state = state_IGNORE;
-        }
-        break;
+  // Private Methods
 
-      case state_M1:
-        switch (c) {
-          case '0': state = state_M10;    break;
-          case '1': state = state_M11;    break;
-          default: state = state_IGNORE;
-        }
-        break;
-
-      case state_M10:
-        state = (c == '8') ? state_M108 : state_IGNORE;
-        break;
-
-      case state_M11:
-        state = (c == '2') ? state_M112 : state_IGNORE;
-        break;
-
-      case state_M4:
-        state = (c == '1') ? state_M41 : state_IGNORE;
-        break;
-
-      case state_M41:
-        state = (c == '0') ? state_M410 : state_IGNORE;
-        break;
-
-      case state_IGNORE:
-        if (c == '\n') state = state_RESET;
-        break;
-
-      default:
-        if (c == '\n') {
-          switch (state) {
-            case state_M108:
-              wait_for_user = wait_for_heatup = false;
-              break;
-            case state_M112:
-              kill(PSTR(MSG_KILLED));
-              break;
-            case state_M410:
-              quickstop_stepper();
-              break;
-            default:
-              break;
-          }
-          state = state_RESET;
-        }
+  void MarlinSerial::printNumber(unsigned long n, uint8_t base) {
+    if (n) {
+      unsigned char buf[8 * sizeof(long)]; // Enough space for base 2
+      int8_t i = 0;
+      while (n) {
+        buf[i++] = n % base;
+        n /= base;
+      }
+      while (i--)
+        print((char)(buf[i] + (buf[i] < 10 ? '0' : 'A' - 10)));
     }
+    else
+      print('0');
   }
 
+  void MarlinSerial::printFloat(double number, uint8_t digits) {
+    // Handle negative numbers
+    if (number < 0.0) {
+      print('-');
+      number = -number;
+    }
+
+    // Round correctly so that print(1.999, 2) prints as "2.00"
+    double rounding = 0.5;
+    for (uint8_t i = 0; i < digits; ++i)
+      rounding *= 0.1;
+
+    number += rounding;
+
+    // Extract the integer part of the number and print it
+    unsigned long int_part = (unsigned long)number;
+    double remainder = number - (double)int_part;
+    print(int_part);
+
+    // Print the decimal point, but only if there are digits beyond
+    if (digits) {
+      print('.');
+      // Extract digits from the remainder one at a time
+      while (digits--) {
+        remainder *= 10.0;
+        int toPrint = int(remainder);
+        print(toPrint);
+        remainder -= toPrint;
+      }
+    }
+  }
+
+  // Preinstantiate
+  MarlinSerial customizedSerial;
+
+#endif // !USBCON && (UBRRH || UBRR0H || UBRR1H || UBRR2H || UBRR3H)
+
+// For AT90USB targets use the UART for BT interfacing
+#if defined(USBCON) && ENABLED(BLUETOOTH)
+  HardwareSerial bluetoothSerial;
 #endif
diff --git a/Marlin/MarlinSerial.h b/Marlin/MarlinSerial.h
index 87f4f6a92..7ec7b2c26 100644
--- a/Marlin/MarlinSerial.h
+++ b/Marlin/MarlinSerial.h
@@ -29,8 +29,8 @@
 
 */
 
-#ifndef MarlinSerial_h
-#define MarlinSerial_h
+#ifndef MARLINSERIAL_H
+#define MARLINSERIAL_H
 
 #include "MarlinConfig.h"
 
@@ -52,125 +52,118 @@
   #define SERIAL_REGNAME_INTERNAL(registerbase,number,suffix) registerbase##number##suffix
 #endif
 
-// Registers used by MarlinSerial class (these are expanded
-// depending on selected serial port
-#define M_UCSRxA SERIAL_REGNAME(UCSR,SERIAL_PORT,A) // defines M_UCSRxA to be UCSRnA where n is the serial port number
-#define M_UCSRxB SERIAL_REGNAME(UCSR,SERIAL_PORT,B)
-#define M_RXENx SERIAL_REGNAME(RXEN,SERIAL_PORT,)
-#define M_TXENx SERIAL_REGNAME(TXEN,SERIAL_PORT,)
-#define M_TXCx SERIAL_REGNAME(TXC,SERIAL_PORT,)
-#define M_RXCIEx SERIAL_REGNAME(RXCIE,SERIAL_PORT,)
-#define M_UDREx SERIAL_REGNAME(UDRE,SERIAL_PORT,)
-#define M_UDRIEx SERIAL_REGNAME(UDRIE,SERIAL_PORT,)
-#define M_UDRx SERIAL_REGNAME(UDR,SERIAL_PORT,)
-#define M_UBRRxH SERIAL_REGNAME(UBRR,SERIAL_PORT,H)
-#define M_UBRRxL SERIAL_REGNAME(UBRR,SERIAL_PORT,L)
-#define M_RXCx SERIAL_REGNAME(RXC,SERIAL_PORT,)
-#define M_USARTx_RX_vect SERIAL_REGNAME(USART,SERIAL_PORT,_RX_vect)
-#define M_U2Xx SERIAL_REGNAME(U2X,SERIAL_PORT,)
+// Registers used by MarlinSerial class (expanded depending on selected serial port)
+#define M_UCSRxA           SERIAL_REGNAME(UCSR,SERIAL_PORT,A) // defines M_UCSRxA to be UCSRnA where n is the serial port number
+#define M_UCSRxB           SERIAL_REGNAME(UCSR,SERIAL_PORT,B)
+#define M_RXENx            SERIAL_REGNAME(RXEN,SERIAL_PORT,)
+#define M_TXENx            SERIAL_REGNAME(TXEN,SERIAL_PORT,)
+#define M_TXCx             SERIAL_REGNAME(TXC,SERIAL_PORT,)
+#define M_RXCIEx           SERIAL_REGNAME(RXCIE,SERIAL_PORT,)
+#define M_UDREx            SERIAL_REGNAME(UDRE,SERIAL_PORT,)
+#define M_UDRIEx           SERIAL_REGNAME(UDRIE,SERIAL_PORT,)
+#define M_UDRx             SERIAL_REGNAME(UDR,SERIAL_PORT,)
+#define M_UBRRxH           SERIAL_REGNAME(UBRR,SERIAL_PORT,H)
+#define M_UBRRxL           SERIAL_REGNAME(UBRR,SERIAL_PORT,L)
+#define M_RXCx             SERIAL_REGNAME(RXC,SERIAL_PORT,)
+#define M_USARTx_RX_vect   SERIAL_REGNAME(USART,SERIAL_PORT,_RX_vect)
+#define M_U2Xx             SERIAL_REGNAME(U2X,SERIAL_PORT,)
 #define M_USARTx_UDRE_vect SERIAL_REGNAME(USART,SERIAL_PORT,_UDRE_vect)
 
-
 #define DEC 10
 #define HEX 16
 #define OCT 8
 #define BIN 2
 #define BYTE 0
 
-
 #ifndef USBCON
-// Define constants and variables for buffering incoming serial data.  We're
-// using a ring buffer (I think), in which rx_buffer_head is the index of the
-// location to which to write the next incoming character and rx_buffer_tail
-// is the index of the location from which to read.
-// 256 is the max limit due to uint8_t head and tail. Use only powers of 2. (...,16,32,64,128,256)
-#ifndef RX_BUFFER_SIZE
-  #define RX_BUFFER_SIZE 128
-#endif
-#ifndef TX_BUFFER_SIZE
-  #define TX_BUFFER_SIZE 32
-#endif
-#if !((RX_BUFFER_SIZE == 256) ||(RX_BUFFER_SIZE == 128) ||(RX_BUFFER_SIZE == 64) ||(RX_BUFFER_SIZE == 32) ||(RX_BUFFER_SIZE == 16) ||(RX_BUFFER_SIZE == 8) ||(RX_BUFFER_SIZE == 4) ||(RX_BUFFER_SIZE == 2))
-  #error "RX_BUFFER_SIZE has to be a power of 2 and >= 2"
-#endif
-#if !((TX_BUFFER_SIZE == 256) ||(TX_BUFFER_SIZE == 128) ||(TX_BUFFER_SIZE == 64) ||(TX_BUFFER_SIZE == 32) ||(TX_BUFFER_SIZE == 16) ||(TX_BUFFER_SIZE == 8) ||(TX_BUFFER_SIZE == 4) ||(TX_BUFFER_SIZE == 2) ||(TX_BUFFER_SIZE == 0))
-  #error TX_BUFFER_SIZE has to be a power of 2 or 0
-#endif
-
-struct ring_buffer_r {
-  unsigned char buffer[RX_BUFFER_SIZE];
-  volatile uint8_t head;
-  volatile uint8_t tail;
-};
+  // Define constants and variables for buffering incoming serial data.  We're
+  // using a ring buffer (I think), in which rx_buffer_head is the index of the
+  // location to which to write the next incoming character and rx_buffer_tail
+  // is the index of the location from which to read.
+  // 256 is the max limit due to uint8_t head and tail. Use only powers of 2. (...,16,32,64,128,256)
+  #ifndef RX_BUFFER_SIZE
+    #define RX_BUFFER_SIZE 128
+  #endif
+  #ifndef TX_BUFFER_SIZE
+    #define TX_BUFFER_SIZE 32
+  #endif
+  #if !((RX_BUFFER_SIZE == 256) ||(RX_BUFFER_SIZE == 128) ||(RX_BUFFER_SIZE == 64) ||(RX_BUFFER_SIZE == 32) ||(RX_BUFFER_SIZE == 16) ||(RX_BUFFER_SIZE == 8) ||(RX_BUFFER_SIZE == 4) ||(RX_BUFFER_SIZE == 2))
+    #error "RX_BUFFER_SIZE has to be a power of 2 and >= 2"
+  #endif
+  #if !((TX_BUFFER_SIZE == 256) ||(TX_BUFFER_SIZE == 128) ||(TX_BUFFER_SIZE == 64) ||(TX_BUFFER_SIZE == 32) ||(TX_BUFFER_SIZE == 16) ||(TX_BUFFER_SIZE == 8) ||(TX_BUFFER_SIZE == 4) ||(TX_BUFFER_SIZE == 2) ||(TX_BUFFER_SIZE == 0))
+    #error TX_BUFFER_SIZE has to be a power of 2 or 0
+  #endif
 
-#if TX_BUFFER_SIZE > 0
-  struct ring_buffer_t {
-    unsigned char buffer[TX_BUFFER_SIZE];
+  struct ring_buffer_r {
+    unsigned char buffer[RX_BUFFER_SIZE];
     volatile uint8_t head;
     volatile uint8_t tail;
   };
-#endif
 
-#if UART_PRESENT(SERIAL_PORT)
-  extern ring_buffer_r rx_buffer;
   #if TX_BUFFER_SIZE > 0
-    extern ring_buffer_t tx_buffer;
+    struct ring_buffer_t {
+      unsigned char buffer[TX_BUFFER_SIZE];
+      volatile uint8_t head;
+      volatile uint8_t tail;
+    };
   #endif
-#endif
-
-#if ENABLED(EMERGENCY_PARSER)
-  #include "language.h"
-  void emergency_parser(unsigned char c);
-#endif
 
-class MarlinSerial { //: public Stream
-
-  public:
-    MarlinSerial();
-    static void begin(long);
-    static void end();
-    static int peek(void);
-    static int read(void);
-    static void flush(void);
-    static uint8_t available(void);
-    static void checkRx(void);
-    static void write(uint8_t c);
+  #if UART_PRESENT(SERIAL_PORT)
+    extern ring_buffer_r rx_buffer;
     #if TX_BUFFER_SIZE > 0
-      static uint8_t availableForWrite(void);
-      static void flushTX(void);
+      extern ring_buffer_t tx_buffer;
     #endif
+  #endif
+
+  class MarlinSerial { //: public Stream
+
+    public:
+      MarlinSerial() {};
+      static void begin(long);
+      static void end();
+      static int peek(void);
+      static int read(void);
+      static void flush(void);
+      static uint8_t available(void);
+      static void checkRx(void);
+      static void write(uint8_t c);
+      #if TX_BUFFER_SIZE > 0
+        static uint8_t availableForWrite(void);
+        static void flushTX(void);
+      #endif
+
+    private:
+      static void printNumber(unsigned long, uint8_t);
+      static void printFloat(double, uint8_t);
+
+    public:
+      static FORCE_INLINE void write(const char* str) { while (*str) write(*str++); }
+      static FORCE_INLINE void write(const uint8_t* buffer, size_t size) { while (size--) write(*buffer++); }
+      static FORCE_INLINE void print(const String& s) { for (int i = 0; i < (int)s.length(); i++) write(s[i]); }
+      static FORCE_INLINE void print(const char* str) { write(str); }
+
+      static void print(char, int = BYTE);
+      static void print(unsigned char, int = BYTE);
+      static void print(int, int = DEC);
+      static void print(unsigned int, int = DEC);
+      static void print(long, int = DEC);
+      static void print(unsigned long, int = DEC);
+      static void print(double, int = 2);
+
+      static void println(const String& s);
+      static void println(const char[]);
+      static void println(char, int = BYTE);
+      static void println(unsigned char, int = BYTE);
+      static void println(int, int = DEC);
+      static void println(unsigned int, int = DEC);
+      static void println(long, int = DEC);
+      static void println(unsigned long, int = DEC);
+      static void println(double, int = 2);
+      static void println(void);
+  };
+
+  extern MarlinSerial customizedSerial;
 
-  private:
-    static void printNumber(unsigned long, uint8_t);
-    static void printFloat(double, uint8_t);
-
-  public:
-    static FORCE_INLINE void write(const char* str) { while (*str) write(*str++); }
-    static FORCE_INLINE void write(const uint8_t* buffer, size_t size) { while (size--) write(*buffer++); }
-    static FORCE_INLINE void print(const String& s) { for (int i = 0; i < (int)s.length(); i++) write(s[i]); }
-    static FORCE_INLINE void print(const char* str) { write(str); }
-
-    static void print(char, int = BYTE);
-    static void print(unsigned char, int = BYTE);
-    static void print(int, int = DEC);
-    static void print(unsigned int, int = DEC);
-    static void print(long, int = DEC);
-    static void print(unsigned long, int = DEC);
-    static void print(double, int = 2);
-
-    static void println(const String& s);
-    static void println(const char[]);
-    static void println(char, int = BYTE);
-    static void println(unsigned char, int = BYTE);
-    static void println(int, int = DEC);
-    static void println(unsigned int, int = DEC);
-    static void println(long, int = DEC);
-    static void println(unsigned long, int = DEC);
-    static void println(double, int = 2);
-    static void println(void);
-};
-
-extern MarlinSerial customizedSerial;
 #endif // !USBCON
 
 // Use the UART for Bluetooth in AT90USB configurations
@@ -178,4 +171,4 @@ extern MarlinSerial customizedSerial;
   extern HardwareSerial bluetoothSerial;
 #endif
 
-#endif
+#endif // MARLINSERIAL_H