-/* Return yx_uint16 coordinate one step from "yx" in direction "dir" (east: 'E',
- * west: 'W', north: 'N', south: 'S'). If "dir" is invalid or would wrap the
+/* Return yx_uint16 coordinate one step from "yx" in direction "dir" (numpad
+ * digits: north '8', east: '6', etc.) If "dir" is invalid or would wrap the