Add Einsy Rambo pins (#9850)

Marlin/src/core/boards.h

 #define BOARD_RAMBO             301   // Rambo
 #define BOARD_MINIRAMBO         302   // Mini-Rambo
 #define BOARD_MINIRAMBO_10A     303   // Mini-Rambo 1.0a
+#define BOARD_EINSY_RAMBO       304   // Einsy Rambo
 #define BOARD_ELEFU_3           21    // Elefu Ra Board (v3)
 #define BOARD_LEAPFROG          999   // Leapfrog
 #define BOARD_MEGACONTROLLER    310   // Mega controller

Marlin/src/pins/pins.h

   #include "pins_RAMBO.h"             // ATmega2560
 #elif MB(MINIRAMBO) || MB(MINIRAMBO_10A)
   #include "pins_MINIRAMBO.h"         // ATmega2560
+#elif MB(EINSY_RAMBO)
+  #include "pins_EINSY_RAMBO.h"       // ATmega2560
 #elif MB(ELEFU_3)
   #include "pins_ELEFU_3.h"           // ATmega2560
 #elif MB(LEAPFROG)

Marlin/src/pins/pins_EINSY_RAMBO.h

+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 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 <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Einsy-Rambo pin assignments
+ */
+
+#ifndef __AVR_ATmega2560__
+  #error "Oops!  Make sure you have 'Arduino Mega 2560 or Rambo' selected from the 'Tools -> Boards' menu."
+#endif
+
+#define BOARD_NAME          "Einsy Rambo"
+#define LARGE_FLASH         true
+
+//
+// TMC2130 Configuration_adv defaults for EinsyRambo
+//
+#if DISABLED(HAVE_TMC2130)
+  #error "You must enable TMC2130 support in Configuration_adv.h for EinsyRambo."
+#elif DISABLED(X_IS_TMC2130) || DISABLED(Y_IS_TMC2130) || DISABLED(Z_IS_TMC2130) || DISABLED(E0_IS_TMC2130)
+  #error "You must enable ([XYZ]|E0)_IS_TMC2130 in Configuration_adv.h for EinsyRambo."
+#endif
+
+// TMC2130 Diag Pins (currently just for reference)
+#define X_DIAG_PIN      64
+#define Y_DIAG_PIN      69
+#define Z_DIAG_PIN      68
+#define E0_DIAG_PIN     65
+
+//
+// Limit Switches
+//
+#define X_MIN_PIN          64 //12
+#define X_MAX_PIN          -1
+#define Y_MIN_PIN          69 //11
+#define Y_MAX_PIN          -1
+#define Z_MIN_PIN          68 //10
+#define Z_MAX_PIN          -1
+
+//
+// Z Probe (when not Z_MIN_PIN)
+//
+#ifndef Z_MIN_PROBE_PIN
+  #define Z_MIN_PROBE_PIN  10
+#endif
+
+//
+// Steppers
+//
+#define X_STEP_PIN         37
+#define X_DIR_PIN          49
+#define X_ENABLE_PIN       29
+#define X_CS_PIN           41
+
+#define Y_STEP_PIN         36
+#define Y_DIR_PIN          48
+#define Y_ENABLE_PIN       28
+#define Y_CS_PIN           39
+
+#define Z_STEP_PIN         35
+#define Z_DIR_PIN          47
+#define Z_ENABLE_PIN       27
+#define Z_CS_PIN           67
+
+#define E0_STEP_PIN        34
+#define E0_DIR_PIN         43
+#define E0_ENABLE_PIN      26
+#define E0_CS_PIN          66
+
+#define E1_STEP_PIN        -1
+#define E1_DIR_PIN         -1
+#define E1_ENABLE_PIN      -1
+
+// Microstepping pins - uses SPI instead
+#define X_MS1_PIN          -1
+#define X_MS2_PIN          -1
+#define Y_MS1_PIN          -1
+#define Y_MS2_PIN          -1
+#define Z_MS1_PIN          -1
+#define Z_MS2_PIN          -1
+#define E0_MS1_PIN         -1
+#define E0_MS2_PIN         -1
+
+//
+// Temperature Sensors
+//
+#define TEMP_0_PIN          0   // Analog Input
+#define TEMP_1_PIN          1   // Analog Input
+#define TEMP_BED_PIN        2   // Analog Input
+
+//
+// Heaters / Fans
+//
+#define HEATER_0_PIN        3
+#define HEATER_1_PIN       -1
+#define HEATER_2_PIN       -1
+#define HEATER_BED_PIN      4
+
+#define FAN_PIN             8
+#define FAN1_PIN            6
+
+//
+// Misc. Functions
+//
+#define SDSS               77
+#define LED_PIN            13
+#define CASE_LIGHT_PIN      9
+
+//
+// M3/M4/M5 - Spindle/Laser Control
+//
+// use P1 connector for spindle pins
+#define SPINDLE_LASER_PWM_PIN     9  // MUST BE HARDWARE PWM
+#define SPINDLE_LASER_ENABLE_PIN 18  // Pin should have a pullup!
+#define SPINDLE_DIR_PIN          19
+
+//
+// Průša i3 MK2 Multiplexer Support
+//
+#define E_MUX0_PIN         17
+#define E_MUX1_PIN         16
+#define E_MUX2_PIN         78  // 84 in MK2 Firmware, with BEEPER as 78
+
+//
+// LCD / Controller
+//
+#if ENABLED(ULTRA_LCD)
+
+  #define KILL_PIN 32
+
+  #if ENABLED(NEWPANEL)
+
+    #if ENABLED(CR10_STOCKDISPLAY)
+      #define LCD_PINS_RS     85
+      #define LCD_PINS_ENABLE 71
+      #define LCD_PINS_D4     70
+      #define BTN_EN1         61
+      #define BTN_EN2         59
+    #else
+      #define LCD_PINS_RS     82
+      #define LCD_PINS_ENABLE 61
+      #define LCD_PINS_D4     59
+      #define LCD_PINS_D5     70
+      #define LCD_PINS_D6     85
+      #define LCD_PINS_D7     71
+      #define BTN_EN1         14
+      #define BTN_EN2         72
+    #endif
+
+    #define BTN_ENC            9  // AUX-2
+    #define BEEPER_PIN        84  // AUX-4
+    #define SD_DETECT_PIN     15
+
+  #endif // NEWPANEL
+#endif // ULTRA_LCD