diff --git a/include/functions.h b/include/functions.h
index 2cc83af..63877df 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -18,7 +18,7 @@ extern void func_80003004(void *); // type unknown
 extern void func_80003B30(void *, s32, s32, s32); // types unknown
 
 // 5580.s
-extern void func_80004CC0(void *, s32, s32); // types unknown
+extern void func_80004CC0(OSThread *, s32, s32);
 extern void func_80004CF4(void *); // types unknown
 extern void func_80004D20(void *); // types unknown
 extern void func_800052B4(void);
diff --git a/src/DDC0.c b/src/DDC0.c
index ff9d92f..adccb24 100644
--- a/src/DDC0.c
+++ b/src/DDC0.c
@@ -2,16 +2,6 @@
 #include "dp_intro.h"
 
 extern s32 D_800A83A0;
-extern s32 D_800A847C;
-extern s32 D_800A8478;
-
-extern OSThread D_800A8480;
-extern u8 D_800AA660[];
-
-extern OSMesgQueue D_800A83AC;
-extern OSMesgQueue D_800A8414;
-
-extern void func_80004CC0(void *, s32, s32);
 
 struct Unk800A83A8 {
     OSMesg mesg;
@@ -24,6 +14,13 @@ struct Unk800A83A8 {
 
 extern struct Unk800A83A8 D_800A83A8[];
 
+extern s32 D_800A8478;
+extern s32 D_800A847C;
+
+extern OSThread D_800A8480;
+
+extern u8 D_800AA660[];
+
 void func_8000D1C0(void) {
 
 }
@@ -106,10 +103,10 @@ void func_8000D3A8(void *unused) {
     D_800A83A0 = 1;
     D_800A847C = -1;
     D_800A8478 = 0;
-    osCreateMesgQueue(&D_800A83AC, &D_800A83A8[0].mesg, 1);
-    osCreateMesgQueue(&D_800A8414, &D_800A83A8[1].mesg, 1);
-    osSendMesg(&D_800A83AC, (void* )0x444F4E45, 0);
-    osSendMesg(&D_800A8414, (void* )0x444F4E45, 0);
+    osCreateMesgQueue(&D_800A83A8[0].queue, &D_800A83A8[0].mesg, 1);
+    osCreateMesgQueue(&D_800A83A8[1].queue, &D_800A83A8[1].mesg, 1);
+    osSendMesg(&D_800A83A8[0].queue, (void* )0x444F4E45, 0);
+    osSendMesg(&D_800A83A8[1].queue, (void* )0x444F4E45, 0);
     func_800373D8();
     func_8004AF24(0);
     func_8004AE90(3, 4);
@@ -120,7 +117,7 @@ void func_8000D3A8(void *unused) {
         func_80009210();
         if ((D_800A83A0 != 0) && (D_800A62E0.unkA38 < 0x15)) {
             func_80037340(&D_800A83A8[D_800A8478].mesg20);
-            func_800053B4(&D_800A83A8[D_800A8478], 0);
+            func_800053B4(&D_800A83A8[D_800A8478].mesg, 0);
         }
         D_800A8478 ^= 1;
         func_80009210();
diff --git a/src/dp_intro.c b/src/dp_intro.c
index b23e3a1..a15415a 100644
--- a/src/dp_intro.c
+++ b/src/dp_intro.c
@@ -228,7 +228,7 @@ void func_8000183C(UNUSED void *arg) {
     __osSetFpcCsr(0x01000C01);
     func_80001C1C(&D_8008474C, 0, 1, 2, 0xFF, 0, 0, 0);
     func_80001C1C(&D_8008473C, 0, 1, 2, 0xFF, 0, 0, 0);
-    func_80004CC0(&D_80083CA0, 0, 4);
+    func_80004CC0(&D_80083CA0.thread, 0, 4);
     func_80005328(&D_80083CA0);
     func_80001380(&D_800846C0);
     while(1) {