diff --git a/Marlin/src/HAL/HAL_DUE/spi_pins.h b/Marlin/src/HAL/HAL_DUE/spi_pins.h
index d0eb711df2..ee80cb3883 100644
--- a/Marlin/src/HAL/HAL_DUE/spi_pins.h
+++ b/Marlin/src/HAL/HAL_DUE/spi_pins.h
@@ -48,9 +48,15 @@
 #else
   // defaults
   #define DUE_SOFTWARE_SPI
-  #define SCK_PIN           52
-  #define MISO_PIN          50
-  #define MOSI_PIN          51
+  #ifndef SCK_PIN
+    #define SCK_PIN           52
+  #endif
+  #ifndef MISO_PIN
+    #define MISO_PIN          50
+  #endif
+  #ifndef MOSI_PIN
+    #define MOSI_PIN          51
+  #endif
 #endif
 
 /* A.28, A.29, B.21, C.26, C.29 */
diff --git a/Marlin/src/lcd/dogm/status_screen_lite_ST7920.h b/Marlin/src/lcd/dogm/status_screen_lite_ST7920.h
index 6b9baca3a5..08133d2786 100644
--- a/Marlin/src/lcd/dogm/status_screen_lite_ST7920.h
+++ b/Marlin/src/lcd/dogm/status_screen_lite_ST7920.h
@@ -94,6 +94,7 @@ void ST7920_Lite_Status_Screen::write_number(const int16_t value, const uint8_t
     case 3: fmt = PSTR("%3d"); break;
     case 2: fmt = PSTR("%2d"); break;
     case 1: fmt = PSTR("%1d"); break;
+    default: return;
   }
   sprintf_P(str, fmt, value);
   write_str(str);
diff --git a/Marlin/src/lcd/dogm/ultralcd_st7920_u8glib_rrd_AVR.cpp b/Marlin/src/lcd/dogm/ultralcd_st7920_u8glib_rrd_AVR.cpp
index a6d8730062..b7e5a23810 100644
--- a/Marlin/src/lcd/dogm/ultralcd_st7920_u8glib_rrd_AVR.cpp
+++ b/Marlin/src/lcd/dogm/ultralcd_st7920_u8glib_rrd_AVR.cpp
@@ -60,7 +60,7 @@
   #define CPU_ST7920_DELAY_1 DELAY_NS(0)
   #define CPU_ST7920_DELAY_2 DELAY_NS(188)
   #define CPU_ST7920_DELAY_3 DELAY_NS(0)
-#elif MB(MINIRAMBO) || MB(EINSY_RAMBO)
+#elif MB(MINIRAMBO) || MB(EINSY_RAMBO) || MB(EINSY_RETRO)
   #define CPU_ST7920_DELAY_1 DELAY_NS(0)
   #define CPU_ST7920_DELAY_2 DELAY_NS(250)
   #define CPU_ST7920_DELAY_3 DELAY_NS(0)
diff --git a/Marlin/src/pins/pins_ARCHIM2.h b/Marlin/src/pins/pins_ARCHIM2.h
index 824a149239..1e260d3c3c 100644
--- a/Marlin/src/pins/pins_ARCHIM2.h
+++ b/Marlin/src/pins/pins_ARCHIM2.h
@@ -50,6 +50,12 @@
 #define E0_DIAG_PIN        78   // PB23 E1_DIAG
 #define E1_DIAG_PIN        25   // PD0 E2_DIAG
 
+//
+// Servos
+//
+#define SERVO0_PIN          20   // D20 PB12 (Header J20 20)
+#define SERVO1_PIN          21   // D21 PB13 (Header J20 19)
+
 //
 // Limit Switches
 //
@@ -161,7 +167,27 @@
 //
 // Misc. Functions
 //
-#define SDSS               87   // D87 PA29 CS
+
+// Internal MicroSD card reader on the PCB
+#define INT_SCK_PIN         42   // D42 PA19/MCCK
+#define INT_MISO_PIN        43   // D43 PA20/MCCDA
+#define INT_MOSI_PIN        73   // D73 PA21/MCDA0
+#define INT_SDSS            55   // D55 PA24/MCDA3
+
+// The external SD card reader on SC2, as well as 2 Mbyte SPI Flash
+#define SCK_PIN             76   // D76 PA27
+#define MISO_PIN            74   // D74 PA25
+#define MOSI_PIN            75   // D75 PA26
+#define SDSS                87   // D87 PA29
+#define SPI_FLASH_SS        52   // D52 PB21
+
+// Filament runout sensor pins (or GPIO)
+#ifndef FIL_RUNOUT_PIN
+  #define FIL_RUNOUT_PIN    66   // D66 PB15 (Header J20 15)
+#endif
+#ifndef FIL_RUNOUT2_PIN
+  #define FIL_RUNOUT2_PIN   67   // D67 PB16 (Header J20 16)
+#endif
 
 //
 // LCD / Controller
@@ -182,5 +208,5 @@
     #define BTN_EN1        60   // D60 PA3_TIOB1
     #define BTN_EN2        13   // D13 PB27_TIOB0
     #define BTN_ENC        16   // D16 PA13_TXD1 // the click
-  #endif  // NEWPANEL
-#endif // ULTRA_LCD
+  #endif // NEWPANEL
+#endif // ULTRA_LCD || EXTENSIBLE_UI