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diff --git a/Marlin/src/HAL/TEENSY35_36/fastio.h b/Marlin/src/HAL/TEENSY35_36/fastio.h
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * Fast I/O Routines for Teensy 3.5 and Teensy 3.6
+ * Use direct port manipulation to save scads of processor time.
+ * Contributed by Triffid_Hunter and modified by Kliment, thinkyhead, Bob-the-Kuhn, et.al.
+ */
+
+#ifndef MASK
+  #define MASK(PIN) _BV(PIN)
+#endif
+
+#define GPIO_BITBAND_ADDR(reg, bit) (((uint32_t)&(reg) - 0x40000000) * 32 + (bit) * 4 + 0x42000000)
+#define GPIO_BITBAND(reg, bit) (*(uint32_t *)GPIO_BITBAND_ADDR((reg), (bit)))
+
+/**
+ * Magic I/O routines
+ *
+ * Now you can simply SET_OUTPUT(PIN); WRITE(PIN, HIGH); WRITE(PIN, LOW);
+ *
+ * Why double up on these macros? see https://gcc.gnu.org/onlinedocs/gcc-4.8.5/cpp/Stringification.html
+ */
+
+#define _READ(P) bool(CORE_PIN ## P ## _PINREG & CORE_PIN ## P ## _BITMASK)
+
+#define _WRITE(P,V) do{ \
+  if (V) CORE_PIN ## P ## _PORTSET = CORE_PIN ## P ## _BITMASK; \
+  else CORE_PIN ## P ## _PORTCLEAR = CORE_PIN ## P ## _BITMASK; \
+}while(0)
+
+#define _TOGGLE(P) (*(&(CORE_PIN ## P ## _PORTCLEAR)+1) = CORE_PIN ## P ## _BITMASK)
+
+#define _SET_INPUT(P) do{ \
+  CORE_PIN ## P ## _CONFIG = PORT_PCR_MUX(1); \
+  GPIO_BITBAND(CORE_PIN ## P ## _DDRREG , CORE_PIN ## P ## _BIT) = 0; \
+}while(0)
+
+#define _SET_OUTPUT(P) do{ \
+  CORE_PIN ## P ## _CONFIG = PORT_PCR_MUX(1)|PORT_PCR_SRE|PORT_PCR_DSE; \
+  GPIO_BITBAND(CORE_PIN ## P ## _DDRREG , CORE_PIN ## P ## _BIT) = 1; \
+}while(0)
+
+#define _SET_INPUT_PULLUP(P) do{ \
+  CORE_PIN ## P ## _CONFIG = PORT_PCR_MUX(1) | PORT_PCR_PE | PORT_PCR_PS; \
+  GPIO_BITBAND(CORE_PIN ## P ## _DDRREG , CORE_PIN ## P ## _BIT) = 0; \
+}while(0)
+
+#define _IS_INPUT(P)    ((CORE_PIN ## P ## _DDRREG & CORE_PIN ## P ## _BITMASK) == 0)
+#define _IS_OUTPUT(P)   ((CORE_PIN ## P ## _DDRREG & CORE_PIN ## P ## _BITMASK) == 0)
+
+#define READ(IO)              _READ(IO)
+
+#define WRITE(IO,V)           _WRITE(IO,V)
+#define TOGGLE(IO)            _TOGGLE(IO)
+
+#define SET_INPUT(IO)         _SET_INPUT(IO)
+#define SET_INPUT_PULLUP(IO)  _SET_INPUT_PULLUP(IO)
+#define SET_INPUT_PULLDOWN    SET_INPUT
+#define SET_OUTPUT(IO)        _SET_OUTPUT(IO)
+#define SET_PWM               SET_OUTPUT
+
+#define IS_INPUT(IO)          _IS_INPUT(IO)
+#define IS_OUTPUT(IO)         _IS_OUTPUT(IO)
+
+#define OUT_WRITE(IO,V)       do{ SET_OUTPUT(IO); WRITE(IO,V); }while(0)
+
+// digitalRead/Write wrappers
+#define extDigitalRead(IO)    digitalRead(IO)
+#define extDigitalWrite(IO,V) digitalWrite(IO,V)
+
+#define PWM_PIN(P)            digitalPinHasPWM(P)
+
+/**
+ * Ports, functions, and pins
+ */
+
+#define DIO0_PIN 8