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Co-Authored-By: Martin Turski <turningtides@outlook.de>
Infobitas · May 17, 2023 · ebe3fe0 · ebe3fe0
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diff --git a/Marlin/src/HAL/AVR/fastio/fastio_1280.h b/Marlin/src/HAL/AVR/fastio/fastio_1280.h
@@ -27,6 +27,9 @@
  *   Hardware Pin  : 02 03 06 07 01 05 15 16 17 18 23 24 25 26 64 63 13 12 46 45 44 43 78 77 76 75 74 73 72 71 60 59 58 57 56 55 54 53 50 70 52 51 42 41 40 39 38 37 36 35 22 21 20 19 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 | 04 08 09 10 11 14 27 28 29 30 31 32 33 34 47 48 49 61 62 65 66 67 68 69 79 80 81 98 99 100
  *   Port          : E0 E1 E4 E5 G5 E3 H3 H4 H5 H6 B4 B5 B6 B7 J1 J0 H1 H0 D3 D2 D1 D0 A0 A1 A2 A3 A4 A5 A6 A7 C7 C6 C5 C4 C3 C2 C1 C0 D7 G2 G1 G0 L7 L6 L5 L4 L3 L2 L1 L0 B3 B2 B1 B0 F0 F1 F2 F3 F4 F5 F6 F7 K0 K1 K2 K3 K4 K5 K6 K7 | E2 E6 E7 xx xx H2 H7 G3 G4 xx xx xx xx xx D4 D5 D6 xx xx J2 J3 J4 J5 J6 J7 xx xx xx xx xx
  *   Logical Pin   : 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | 78 79 80 xx xx 84 85 71 70 xx xx xx xx xx 81 82 83 xx xx 72 73 75 76 77 74 xx xx xx xx xx
+ *
+ * Arduino Pin Layout video: https://youtu.be/rIqeVCX09FA
+ * AVR alternate pin function overview video: https://youtu.be/1yd8wuI5Plg
  */
 
 #include "../fastio.h"

diff --git a/Marlin/src/HAL/AVR/fastio/fastio_1281.h b/Marlin/src/HAL/AVR/fastio/fastio_1281.h
@@ -26,6 +26,9 @@
  *
  *   Logical Pin: 38 39 40 41 42 43 44 45 16 10 11 12 06 07 08 09 30 31 32 33 34 35 36 37 17 18 19 20 21 22 23 24 00 01 13 05 02 03 14 15 46 47 48 49 50 51 52 53 25 26 27 28 29 04
  *   Port:        A0 A1 A2 A3 A4 A5 A6 A7 B0 B1 B2 B3 B4 B5 B6 B7 C0 C1 C2 C3 C4 C5 C6 C7 D0 D1 D2 D3 D4 D5 D6 D7 E0 E1 E2 E3 E4 E5 E6 E7 F0 F1 F2 F3 F4 F5 F6 F7 G0 G1 G2 G3 G4 G5
+ *
+ * Arduino Pin Layout video: https://youtu.be/rIqeVCX09FA
+ * AVR alternate pin function overview video: https://youtu.be/1yd8wuI5Plg
  */
 
 #include "../fastio.h"

diff --git a/Marlin/src/HAL/AVR/fastio/fastio_168.h b/Marlin/src/HAL/AVR/fastio/fastio_168.h
@@ -26,6 +26,9 @@
  *
  *   Logical Pin: 08 09 10 11 12 13 14 15 16 17 18 19 20 21 00 01 02 03 04 05 06 07
  *   Port:        B0 B1 B2 B3 B4 B5 C0 C1 C2 C3 C4 C5 C6 C7 D0 D1 D2 D3 D4 D5 D6 D7
+ *
+ * Arduino Pin Layout video: https://youtu.be/rIqeVCX09FA
+ * AVR alternate pin function overview video: https://youtu.be/1yd8wuI5Plg
  */
 
 #include "../fastio.h"

diff --git a/Marlin/src/HAL/AVR/fastio/fastio_644.h b/Marlin/src/HAL/AVR/fastio/fastio_644.h
@@ -26,6 +26,9 @@
  *
  *   Logical Pin: 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
  *   Port:        B0 B1 B2 B3 B4 B5 B6 B7 D0 D1 D2 D3 D4 D5 D6 D7 C0 C1 C2 C3 C4 C5 C6 C7 A7 A6 A5 A4 A3 A2 A1 A0
+ *
+ * Arduino Pin Layout video: https://youtu.be/rIqeVCX09FA
+ * AVR alternate pin function overview video: https://youtu.be/1yd8wuI5Plg
  */
 
 /**                        ATMega644

diff --git a/Marlin/src/HAL/AVR/fastio/fastio_AT90USB.h b/Marlin/src/HAL/AVR/fastio/fastio_AT90USB.h
@@ -27,6 +27,9 @@
  *   Logical Pin: 28 29 30 31 32 33 34 35 20 21 22 23 24 25 26 27 10 11 12 13 14 15 16 17 00 01 02 03 04 05 06 07 08 09(46*47)36 37 18 19 38 39 40 41 42 43 44 45
  *   Port:        A0 A1 A2 A3 A4 A5 A6 A7 B0 B1 B2 B3 B4 B5 B6 B7 C0 C1 C2 C3 C4 C5 C6 C7 D0 D1 D2 D3 D4 D5 D6 D7 E0 E1 E2 E3 E4 E5 E6 E7 F0 F1 F2 F3 F4 F5 F6 F7
  *            The logical pins 46 and 47 are not supported by Teensyduino, but are supported below as E2 and E3
+ *
+ * Arduino Pin Layout video: https://youtu.be/rIqeVCX09FA
+ * AVR alternate pin function overview video: https://youtu.be/1yd8wuI5Plg
  */
 
 #include "../fastio.h"

diff --git a/Marlin/src/HAL/NATIVE_SIM/u8g/LCD_I2C_routines.h b/Marlin/src/HAL/NATIVE_SIM/u8g/LCD_I2C_routines.h
@@ -34,4 +34,3 @@ void u8g_i2c_stop();
 #ifdef __cplusplus
   }
 #endif
-
diff --git a/Marlin/src/HAL/NATIVE_SIM/u8g/LCD_defines.h b/Marlin/src/HAL/NATIVE_SIM/u8g/LCD_defines.h
@@ -40,5 +40,3 @@ uint8_t u8g_com_ST7920_sw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void
 #define U8G_COM_T6963 u8g_com_null_fn
 #define U8G_COM_FAST_PARALLEL u8g_com_null_fn
 #define U8G_COM_UC_I2C u8g_com_null_fn
-
-
diff --git a/Marlin/src/HAL/SAMD21/HAL_SPI.cpp b/Marlin/src/HAL/SAMD21/HAL_SPI.cpp
@@ -64,7 +64,7 @@
   }
 
   void spiInit(uint8_t spiRate) {
-    // Use datarates Marlin uses
+    // Use Marlin datarates
     uint32_t clock;
     switch (spiRate) {
       case SPI_FULL_SPEED:      clock = 8000000; break;

diff --git a/Marlin/src/HAL/SAMD21/fastio.h b/Marlin/src/HAL/SAMD21/fastio.h
@@ -213,4 +213,3 @@
 #define DIO53_PIN   PIN_PA21
 #define DIO54_PIN   PIN_PA06
 #define DIO55_PIN   PIN_PA07
-
diff --git a/Marlin/src/pins/lpc1768/pins_AZSMZ_MINI.h b/Marlin/src/pins/lpc1768/pins_AZSMZ_MINI.h
@@ -23,6 +23,8 @@
 
 /**
  * AZSMZ MINI pin assignments
+ * Schematic: http://green-candy.osdn.jp/external/MarlinFW/board_schematics/AZSMZ%20MINI/AZSMZ.svg
+ * Source: https://raw.githubusercontent.com/Rose-Fish/AZSMZ-mini/master/AZSMZ.sch
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1768/pins_BIQU_B300_V1.0.h b/Marlin/src/pins/lpc1768/pins_BIQU_B300_V1.0.h
@@ -22,11 +22,7 @@
 #pragma once
 
 /**
- * BIQU BQ111-A4
- *
- * Applies to the following boards:
- *
- *  BOARD_BIQU_BQ111_A4 (Hotend, Fan, Bed)
+ * BIQU Thunder B300 V1.0
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1768/pins_BIQU_BQ111_A4.h b/Marlin/src/pins/lpc1768/pins_BIQU_BQ111_A4.h
@@ -23,6 +23,10 @@
 
 /**
  * BIQU BQ111-A4 pin assignments
+ *
+ * Applies to the following boards:
+ *
+ *  BOARD_BIQU_BQ111_A4 (Hotend, Fan, Bed)
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_1.h b/Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_1.h
@@ -23,6 +23,8 @@
 
 /**
  * BigTreeTech SKR 1.1 pin assignments
+ * Schematic: http://green-candy.osdn.jp/external/MarlinFW/board_schematics/BTT%20SKR%20V1.1/SKR-V1.1SchDoc.pdf
+ * Origin: https://github.com/bigtreetech/BIGTREETECH-SKR-V1.1/blob/master/hardware/SKR-V1.1SchDoc.pdf
  */
 
 #define BOARD_INFO_NAME "BTT SKR V1.1"

diff --git a/Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_3.h b/Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_3.h
@@ -23,6 +23,8 @@
 
 /**
  * BigTreeTech SKR 1.3 pin assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/BTT%20SKR%20V1.3/SKR-V1.3-SCH.pdf
+ * Origin: https://github.com/bigtreetech/BIGTREETECH-SKR-V1.3/blob/master/BTT%20SKR%20V1.3/hardware/SKR-V1.3-SCH.pdf
  */
 
 #define BOARD_INFO_NAME "BTT SKR V1.3"

diff --git a/Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_4.h b/Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_4.h
@@ -23,6 +23,8 @@
 
 /**
  * BigTreeTech SKR 1.4 pin assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/BTT%20SKR%20V1.4%20+%20Turbo/BTT%20SKR%20V1.4-SCH.pdf
+ * Origin: https://github.com/bigtreetech/BIGTREETECH-SKR-V1.3/blob/master/BTT%20SKR%20V1.4/Hardware/BTT%20SKR%20V1.4-SCH.pdf
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1768/pins_EMOTRONIC.h b/Marlin/src/pins/lpc1768/pins_EMOTRONIC.h
@@ -23,6 +23,8 @@
 
 /**
  * eMotion-Tech eMotronic pin assignments
+ * Schematic: http://green-candy.osdn.jp/external/MarlinFW/board_schematics/eMotion-Tech%20eMotronic/eMotronic_brd_sources_1.0.4/eMotronic_sch.pdf
+ * Origin: https://data.emotion-tech.com/ftp/Datasheets_et_sources/Sources/eMotronic_brd_sources_1.0.4.zip
  *
  * Board pins<->features assignments are based on the
  * Micro-Delta Rework printer default connections.

diff --git a/Marlin/src/pins/lpc1768/pins_GMARSH_X6_REV1.h b/Marlin/src/pins/lpc1768/pins_GMARSH_X6_REV1.h
@@ -23,6 +23,8 @@
 
 /**
  * GMARSH X6 Rev.1 pin assignments
+ * Schematic: http://green-candy.osdn.jp/external/MarlinFW/board_schematics/GMARSH%20X6%20Rev.1/armprinter_2208_1heater.pdf
+ * Origin: https://github.com/gmarsh/gmarsh_x6/blob/master/armprinter_2208_1heater.pdf
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1768/pins_MKS_SBASE.h b/Marlin/src/pins/lpc1768/pins_MKS_SBASE.h
@@ -23,6 +23,8 @@
 
 /**
  * Makerbase MKS SBASE pin assignments
+ * Schematic (V1.3): https://green-candy.osdn.jp/external/MarlinFW/board_schematics/MKS%20SBASE%20V1.3/MKS%20SBASE%20V1.3_002%20SCH.pdf
+ * Origin (V1.3): http://green-candy.osdn.jp/external/MarlinFW/board_schematics/MKS%20SBASE%20V1.3/MKS%20SBASE%20V1.3_002%20SCH.pdf
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1768/pins_MKS_SGEN_L.h b/Marlin/src/pins/lpc1768/pins_MKS_SGEN_L.h
@@ -23,6 +23,8 @@
 
 /**
  * Makerbase MKS SGEN-L pin assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/MKS_GEN_L_V1_0/MKS%20Gen_L%20V1.0_008%20SCH.pdf
+ * Origin: https://github.com/makerbase-mks/SGEN_L/blob/master/Hardware/MKS%20SGEN_L%20V1.0_001/MKS%20SGEN_L%20V1.0_001%20SCH.pdf
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1768/pins_RAMPS_RE_ARM.h b/Marlin/src/pins/lpc1768/pins_RAMPS_RE_ARM.h
@@ -23,6 +23,8 @@
 
 /**
  * Re-ARM with RAMPS v1.4 pin assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Re-ARM%20RAMPS%201.4/Re_ARM_Schematic.pdf
+ * Origin: https://reprap.org/mediawiki/images/f/fa/Re_ARM_Schematic.pdf
  *
  * Applies to the following boards:
  *

diff --git a/Marlin/src/pins/lpc1768/pins_SELENA_COMPACT.h b/Marlin/src/pins/lpc1768/pins_SELENA_COMPACT.h
@@ -23,6 +23,8 @@
 
 /**
  * Selena Compact pin assignments
+ * Pinout: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Selena%20Compact/Compact%20Pinout.pdf
+ * Origin: https://github.com/f61/Selena/blob/master/Compact%20Pinout.pdf
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1769/pins_AZTEEG_X5_GT.h b/Marlin/src/pins/lpc1769/pins_AZTEEG_X5_GT.h
@@ -23,6 +23,8 @@
 
 /**
  * Azteeg X5 GT pin assignments
+ * Wiring diagram: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Azteeg%20X5%20GT/X5%20GT%20Wiring%20Diagram.pdf
+ * Origin: https://panucattdevices.freshdesk.com/support/solutions/articles/1000244740-support-files
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1769/pins_AZTEEG_X5_MINI.h b/Marlin/src/pins/lpc1769/pins_AZTEEG_X5_MINI.h
@@ -23,6 +23,10 @@
 
 /**
  * Azteeg X5 MINI pin assignments
+ * Schematic (V1): https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Azteeg%20X5%20MINI/x5mini_design_files/X5mini_design_files/V1/X5%20Mini%20PUB%20v1.0.pdf
+ * Schematic (V2): https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Azteeg%20X5%20MINI/x5mini_design_files/X5mini_design_files/V2/X5%20Mini%20V2%20SCH%20Pub.pdf
+ * Schematic (V3): https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Azteeg%20X5%20MINI/x5mini_design_files/X5mini_design_files/V3/X5%20Mini%20V3%20SCH%20Pub.pdf
+ * Origin: http://files.panucatt.com/datasheets/x5mini_design_files.zip
  */
 #include "env_validate.h"
 

diff --git a/Marlin/src/pins/lpc1769/pins_AZTEEG_X5_MINI_WIFI.h b/Marlin/src/pins/lpc1769/pins_AZTEEG_X5_MINI_WIFI.h
@@ -23,6 +23,8 @@
 
 /**
  * Azteeg X5 MINI WIFI pin assignments
+ * Wiring diagram: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Azteeg%20X5%20MINI%20WIFI/x5mini_wifi_wiring.pdf
+ * Origin: http://files.panucatt.com/datasheets/x5mini_wifi_wiring.pdf
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1769/pins_BTT_SKR_E3_TURBO.h b/Marlin/src/pins/lpc1769/pins_BTT_SKR_E3_TURBO.h
@@ -23,6 +23,8 @@
 
 /**
  * BigTreeTech SKR E3 Turbo pin assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/BTT%20SKR%20E3%20Turbo/BTT%20SKR%20E3%20Turbo-SCH.pdf
+ * Origin: https://github.com/bigtreetech/BIGTREETECH-SKR-E3-Turbo/blob/master/Hardware/BTT%20SKR%20E3%20Turbo-SCH.pdf
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1769/pins_BTT_SKR_V1_4_TURBO.h b/Marlin/src/pins/lpc1769/pins_BTT_SKR_V1_4_TURBO.h
@@ -23,6 +23,8 @@
 
 /**
  * BigTreeTech SKR 1.4 Turbo pin assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/BTT%20SKR%20V1.4%20+%20Turbo/BTT%20SKR%20V1.4-SCH.pdf
+ * Origin: https://github.com/bigtreetech/BIGTREETECH-SKR-V1.3/blob/master/BTT%20SKR%20V1.4/Hardware/BTT%20SKR%20V1.4-SCH.pdf
  */
 
 #define BOARD_INFO_NAME "BTT SKR V1.4 TURBO"

diff --git a/Marlin/src/pins/lpc1769/pins_COHESION3D_MINI.h b/Marlin/src/pins/lpc1769/pins_COHESION3D_MINI.h
@@ -23,6 +23,8 @@
 
 /**
  * Cohesion3D Mini pin assignments
+ * Pinout: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Cohesion3D%20Mini/c3d-pinout.jpg
+ * Origin: https://lasergods.com/cohesion3d-mini-pinout-diagram/
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1769/pins_COHESION3D_REMIX.h b/Marlin/src/pins/lpc1769/pins_COHESION3D_REMIX.h
@@ -23,6 +23,8 @@
 
 /**
  * Cohesion3D ReMix pin assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Cohesion3D%20ReMix/C3D%20ReMix%20rev2.svg
+ * Origin: https://github.com/Cohesion3D/Cohesion3D-ReMix/blob/master/C3D%20ReMix%20rev2.sch
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1769/pins_FLY_CDY.h b/Marlin/src/pins/lpc1769/pins_FLY_CDY.h
@@ -23,6 +23,8 @@
 
 /**
  * FLYmaker FLY-CDY pin assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/FLYmaker%20FLY-CDY%20V1/FLY_CDY%20SCH.pdf
+ * Origin: https://github.com/Mellow-3D/FLY-CDY/blob/master/Motherboard%20information/FLY_CDY%20SCH.pdf
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1769/pins_MKS_SGEN.h b/Marlin/src/pins/lpc1769/pins_MKS_SGEN.h
@@ -23,6 +23,8 @@
 
 /**
  * MKS SGen pin assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/MKS%20SGEN/MKS%20SGEN%20V1.0_001%20SCH.pdf
+ * Origin: https://github.com/makerbase-mks/MKS-SGen/blob/master/Hardware/MKS%20SGEN%20V1.0_001/MKS%20SGEN%20V1.0_001%20SCH.pdf
  *
  * Pins diagram:
  * https://github.com/makerbase-mks/MKS-SGen/blob/master/Hardware/MKS%20SGEN%20V1.0_001/MKS%20SGEN%20V1.0_001%20PIN.pdf

diff --git a/Marlin/src/pins/lpc1769/pins_MKS_SGEN_L_V2.h b/Marlin/src/pins/lpc1769/pins_MKS_SGEN_L_V2.h
@@ -23,6 +23,8 @@
 
 /**
  * MKS SGen-L V2 pin assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/MKS%20SGEN_L%20V2/MKS%20SGEN_L%20V2.0_003%20SCH.pdf
+ * Origin: https://github.com/makerbase-mks/MKS-SGEN_L-V2/blob/master/Hardware/MKS%20SGEN_L%20V2.0_003/MKS%20SGEN_L%20V2.0_003%20SCH.pdf
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/lpc1769/pins_SMOOTHIEBOARD.h b/Marlin/src/pins/lpc1769/pins_SMOOTHIEBOARD.h
@@ -23,6 +23,8 @@
 
 /**
  * Smoothieware Smoothieboard pin assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Smoothieware%20Smoothieboard%20V1/http.i.imgur.com.oj4zqs3.png
+ * Origin: http://smoothieware.org/_media///external/http.i.imgur.com.oj4zqs3.png
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/mega/pins_CHEAPTRONIC.h b/Marlin/src/pins/mega/pins_CHEAPTRONIC.h
@@ -23,6 +23,7 @@
 
 /**
  * Cheaptronic v1.0 pin assignments
+ * ATmega2560
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/mega/pins_CHEAPTRONICv2.h b/Marlin/src/pins/mega/pins_CHEAPTRONICv2.h
@@ -24,7 +24,9 @@
 /**
  * Cheaptronic v2.0 pin assignments
  * Built and sold by Michal Dyntar - RRO
- *          www.reprapobchod.cz
+ *          www.reprapobchod.cz (DOES NOT EXIST ANYMORE)
+ *          https://web.archive.org/web/20190306201523/http://reprapobchod.cz/
+ * ATmega2560
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/mega/pins_CNCONTROLS_11.h b/Marlin/src/pins/mega/pins_CNCONTROLS_11.h
@@ -23,6 +23,9 @@
 
 /**
  * CartesioV11 pin assignments
+ * Comes with an Arduino Mega, see
+ * https://web.archive.org/web/20171024190029/http://mauk.cc/mediawiki/index.php/Electronical_assembly
+ * ATmega2560, ATmega1280
  */
 
 #define ALLOW_MEGA1280

diff --git a/Marlin/src/pins/mega/pins_CNCONTROLS_12.h b/Marlin/src/pins/mega/pins_CNCONTROLS_12.h
@@ -23,6 +23,9 @@
 
 /**
  * CartesioV12 pin assignments
+ * Comes with an Arduino Mega, see
+ * https://web.archive.org/web/20171024190029/http://mauk.cc/mediawiki/index.php/Electronical_assembly
+ * ATmega2560, ATmega1280
  */
 
 #define ALLOW_MEGA1280

diff --git a/Marlin/src/pins/mega/pins_CNCONTROLS_15.h b/Marlin/src/pins/mega/pins_CNCONTROLS_15.h
@@ -23,6 +23,7 @@
 
 /**
  * CNControls V15 for HMS434 pin assignments
+ * ATmega2560, ATmega1280
  */
 
 #define ALLOW_MEGA1280

diff --git a/Marlin/src/pins/mega/pins_EINSTART-S.h b/Marlin/src/pins/mega/pins_EINSTART-S.h
@@ -23,6 +23,7 @@
 
 /**
  * Einstart-S pin assignments
+ * ATmega2560, ATmega1280
  * PCB Silkscreen: 3DPrinterCon_v3.5
  */
 

diff --git a/Marlin/src/pins/mega/pins_ELEFU_3.h b/Marlin/src/pins/mega/pins_ELEFU_3.h
@@ -23,6 +23,9 @@
 
 /**
  * Elefu RA Board Pin Assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Elefu%20Ra%20v3/schematic.pdf
+ * Origin: https://github.com/kiyoshigawa/Elefu-RAv3/blob/master/RA_Circuits.zip
+ * ATmega2560
  */
 
 #include "env_validate.h"

diff --git a/Marlin/src/pins/mega/pins_GT2560_REV_A.h b/Marlin/src/pins/mega/pins_GT2560_REV_A.h
@@ -25,6 +25,9 @@
  * Geeetech GT2560 Revision A board pin assignments, based on the work of
  * George Robles (https://georges3dprinters.com) and
  * Richard Smith <galorin@gmail.com>
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Geeetech%20GT2560%20Revision%20A/GT2560_sch.pdf
+ * Origin: https://www.geeetech.com/wiki/images/9/90/GT2560_sch.pdf
+ * ATmega2560
  */
 
 #define ALLOW_MEGA1280

diff --git a/Marlin/src/pins/mega/pins_GT2560_REV_A_PLUS.h b/Marlin/src/pins/mega/pins_GT2560_REV_A_PLUS.h
@@ -23,6 +23,9 @@
 
 /**
  * Geeetech GT2560 Revision A+ board pin assignments
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Geeetech%20GT2560%20Revision%20A+/Hardware_GT2560_RevA+.pdf
+ * Origin: https://www.geeetech.com/wiki/images/d/d3/Hardware_GT2560_RevA%2B.pdf
+ * ATmega2560
  */
 
 #define BOARD_INFO_NAME "GT2560 Rev.A+"

diff --git a/Marlin/src/pins/mega/pins_GT2560_REV_B.h b/Marlin/src/pins/mega/pins_GT2560_REV_B.h
@@ -23,6 +23,9 @@
 
 /**
  * Geeetech GT2560 Rev B Pins
+ * Schematic: https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Geeetech%20GT2560%20Rev%20B/GT2560_REVB.pdf
+ * Origin: https://www.geeetech.com/wiki/images/7/72/GT2560_REVB.pdf
+ * ATmega2560
  */
 
 #define BOARD_INFO_NAME "GT2560 Rev B"

diff --git a/Marlin/src/pins/mega/pins_GT2560_V3.h b/Marlin/src/pins/mega/pins_GT2560_V3.h
@@ -23,6 +23,9 @@
 
 /**
  * Geeetech GT2560 3.0/3.1 pin assignments
+ * Schematic (3.0): https://green-candy.osdn.jp/external/MarlinFW/board_schematics/Geeetech%20GT2560%203.0/GT2560_V3.0_SCH.pdf
+ * Origin (3.0): https://github.com/Geeetech3D/Diagram/blob/master/GT2560_V3.0_SCH.pdf
+ * ATmega2560
  *
  * Also GT2560 RevB and GT2560 4.0/4.1
  */