From 4521f6655b1245e1b72cbd165b0483e0024ae55d Mon Sep 17 00:00:00 2001
From: alexborro <alexborro@gmail.com>
Date: Wed, 18 Mar 2015 12:19:30 -0300
Subject: [PATCH] Restore "S" parameter of M204 for retrocompatibility.

---
 Marlin/Marlin_main.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 58c7d1707..6762767d8 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -3525,6 +3525,13 @@ inline void gcode_M203() {
  *  Also sets minimum segment time in ms (B20000) to prevent buffer under-runs and M20 minimum feedrate
  */
 inline void gcode_M204() {
+  if (code_seen('S'))   // Kept for legacy compatibility. Should NOT BE USED for new developments.
+  {
+    acceleration = code_value();
+    travel_acceleration = acceleration;
+    SERIAL_ECHOPAIR("Setting Printing and Travelling Acceleration: ", acceleration );
+    SERIAL_EOL;
+  }
   if (code_seen('P'))
   {
     acceleration = code_value();