diff --git a/gcode.c b/gcode.c
index 62e0a06..89cd4f4 100644
--- a/gcode.c
+++ b/gcode.c
@@ -35,15 +35,11 @@
 
 /* 
    Omitted for the time being:
- - Spindle direction  
-   
    group 0 = {G10, G28, G30, G53, G92, G92.1, G92.2, G92.3} (Non modal G-codes)
-   group 5 = {G93, G94} feed rate mode
-   group 12 = {G54, G55, G56, G57, G58, G59, G59.1, G59.2, G59.3} coordinate system selection
-   group 13 = {G61, G61.1, G64} path control mode
-   group 4 = {M0, M1, M2, M30, M60} stopping
    group 8 = {M7, M8, M9} coolant (special case: M7 and M8 may be active at the same time)
    group 9 = {M48, M49} enable/disable feed and speed override switches
+   group 12 = {G54, G55, G56, G57, G58, G59, G59.1, G59.2, G59.3} coordinate system selection
+   group 13 = {G61, G61.1, G64} path control mode
 */
 
 #include "gcode.h"
diff --git a/motion_control.c b/motion_control.c
index 8ed6cb3..97e773f 100644
--- a/motion_control.c
+++ b/motion_control.c
@@ -397,9 +397,9 @@ void set_stepper_directions(int8_t *direction)
      or branching. Fast and compact, yet practically unreadable. Sorry sorry sorry.
   */
   direction_bits = ~(
-    ((direction[X_AXIS]&128)>>(7-X_DIRECTION_BIT)) |
-    ((direction[Y_AXIS]&128)>>(7-Y_DIRECTION_BIT)) |
-    ((direction[Z_AXIS]&128)>>(7-Z_DIRECTION_BIT))
+    ((direction[X_AXIS]&0x80)>>(7-X_DIRECTION_BIT)) |
+    ((direction[Y_AXIS]&0x80)>>(7-Y_DIRECTION_BIT)) |
+    ((direction[Z_AXIS]&0x80)>>(7-Z_DIRECTION_BIT))
   );
 }