diff --git a/gcc/bindings.c b/gcc/bindings.c
index 73ee4db..0a4b200 100644
--- a/gcc/bindings.c
+++ b/gcc/bindings.c
@@ -111,7 +111,7 @@ static inline void fill_background(
 }
 
 static inline unsigned short draw_str_to_background(
-    unsigned char* str,
+    char* str,
     unsigned short x,
     unsigned short y,
     unsigned int foreground_color,
@@ -129,7 +129,7 @@ static inline unsigned short draw_str_to_background(
 }
 
 static inline unsigned short draw_format_str_to_background(
-    unsigned char* str,
+    char* str,
     unsigned short x,
     unsigned short y,
     unsigned int foreground_color,
@@ -258,7 +258,7 @@ static inline void fill_overlay(
 }
 
 static inline unsigned short draw_str_to_overlay(
-    unsigned char* str,
+    char* str,
     unsigned short x,
     unsigned short y,
     unsigned int foreground_color,
@@ -278,7 +278,7 @@ static inline unsigned short draw_str_to_overlay(
 }
 
 static inline unsigned short draw_format_str_to_overlay(
-    unsigned char* str,
+    char* str,
     unsigned short x,
     unsigned short y,
     unsigned int foreground_color,
@@ -663,6 +663,10 @@ static inline void is_task_id_used(void) {
     call(0x00000A24);
 }
 
+static inline void save_state_and_yield_task(void) {
+    call(0x00000A28);
+}
+
 // memory jump table
 
 static inline void allocate_memory(void) {
@@ -677,7 +681,7 @@ static inline void free_memory(void) {
 
 static inline void new_window(
     unsigned char* window_struct,
-    unsigned char* title_str,
+    char* title_str,
     unsigned short width,
     unsigned short height,
     unsigned short x,
diff --git a/gcc/bindings.kts b/gcc/bindings.kts
index af1ee2b..93bcd54 100755
--- a/gcc/bindings.kts
+++ b/gcc/bindings.kts
@@ -7,11 +7,11 @@ class Type(val name: String) {
 
 val None = Type("void")
 val Byte = Type("unsigned char")
-val IByte = Type("signed char")
+val IByte = Type("char")
 val Half = Type("unsigned short")
-val IHalf = Type("signed short")
+val IHalf = Type("short")
 val Word = Type("unsigned int")
-val IWord = Type("signed int")
+val IWord = Type("int")
 
 class Variable(val type: Type, val name: String)
 
@@ -202,7 +202,7 @@ define(0xF0042000U, "fill_background") {
     parameter(Word, "color")
 }
 define(0xF0042004U, "draw_str_to_background") {
-    parameter(Byte.ref, "str")
+    parameter(IByte.ref, "str")
     parameter(Half, "x")
     parameter(Half, "y")
     parameter(Word, "foreground_color")
@@ -210,7 +210,7 @@ define(0xF0042004U, "draw_str_to_background") {
     returns(1, Half)
 }
 define(0xF0042008U, "draw_format_str_to_background") {
-    parameter(Byte.ref, "str")
+    parameter(IByte.ref, "str")
     parameter(Half, "x")
     parameter(Half, "y")
     parameter(Word, "foreground_color")
@@ -271,7 +271,7 @@ define(0xF0043000U, "fill_overlay") {
     parameter(Byte, "overlay_number")
 }
 define(0xF0043004U, "draw_str_to_overlay") {
-    parameter(Byte.ref, "str")
+    parameter(IByte.ref, "str")
     parameter(Half, "x")
     parameter(Half, "y")
     parameter(Word, "foreground_color")
@@ -280,7 +280,7 @@ define(0xF0043004U, "draw_str_to_overlay") {
     returns(1, Half)
 }
 define(0xF0043008U, "draw_format_str_to_overlay") {
-    parameter(Byte.ref, "str")
+    parameter(IByte.ref, "str")
     parameter(Half, "x")
     parameter(Half, "y")
     parameter(Word, "foreground_color")
@@ -484,6 +484,8 @@ define(0x00000A20U, "get_unused_task_id") {
 }
 define(0x00000A24U, "is_task_id_used") {
 }
+define(0x00000A28U, "save_state_and_yield_task") {
+}
 
 comment("memory jump table")
 
@@ -496,7 +498,7 @@ comment("window jump table")
 
 define(0x00000C10U, "new_window") {
     parameter(Byte.ref, "window_struct")
-    parameter(Byte.ref, "title_str")
+    parameter(IByte.ref, "title_str")
     parameter(Half, "width")
     parameter(Half, "height")
     parameter(Half, "x")