1 files changed, 67 insertions, 0 deletions
diff --git a/src/rom_850.c b/src/rom_850.c
new file mode 100755
index 0000000..8d49a60
--- /dev/null
+++ b/src/rom_850.c
@@ -0,0 +1,67 @@
+#include "global.h"
+#include "main.h"
+
+extern void (**gUnknown_0200FB98)(void);
+extern void (**gUnknown_02019BE0)(void);
+extern void (*gUnknown_0200FB9C)(void);
+extern void (*gUnknown_0200FBA0)(void);
+extern void (*gUnknown_02017BD0)(void);
+extern void (*gUnknown_02017BD4)(void);
+extern void sub_A08(void);
+extern void sub_A20(void);
+extern void sub_DC4(void);
+
+u16 sub_850(void)
+{
+    if (REG_IME & INTR_FLAG_VBLANK
+     && REG_DISPSTAT & DISPSTAT_VBLANK_INTR
+     && REG_IE & INTR_FLAG_VBLANK
+     && !(REG_DISPCNT & DISPCNT_FORCED_BLANK))
+    {
+        return 1;
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+void sub_898(void (*func)(void))
+{
+    gUnknown_02017BD4 = func;
+    if (!sub_850())
+        gUnknown_0200FB9C = func;
+}
+
+void sub_8BC(void)
+{
+    gUnknown_0200FB9C = sub_DC4;
+    gUnknown_02017BD4 = sub_DC4;
+}
+
+void sub_8D4(void (*func)(void))
+{
+    gUnknown_02017BD0 = func;
+    if (!sub_850())
+        *gUnknown_0200FB98 = func;
+}
+
+void sub_8FC(void)
+{
+    *gUnknown_0200FB98 = sub_A08;
+    gUnknown_02017BD0 = sub_A08;
+}
+
+void sub_918(void (*func)(void))
+{
+    gUnknown_0200FBA0 = func;
+    if (!sub_850())
+        *gUnknown_02019BE0 = func;
+}
+
+void sub_940(void)
+{
+    *gUnknown_02019BE0 = sub_A20;
+    gUnknown_0200FBA0 = sub_A20;
+}
+