diff --git a/include/global.h b/include/global.h
index 0a85fec..448e98d 100644
--- a/include/global.h
+++ b/include/global.h
@@ -35,6 +35,8 @@ extern MallocRecord mallocRecord;
 extern UNK_TYPE D_800DA83C;
 extern UNK_TYPE D_8010DF40;
 
+extern UNK_TYPE D_80108620;
+
 typedef struct Y511F0UnkStruct {
     /* 0x0 */ uintptr_t unk0;
     /* 0x4 */ s16 unk4;
diff --git a/src/main/O2/70100.c b/src/main/O2/70100.c
index 0c8ffd1..9e2c39e 100644
--- a/src/main/O2/70100.c
+++ b/src/main/O2/70100.c
@@ -1,4 +1,23 @@
 #include "global.h"
 
+#define WAIT_ON_IOBUSY_ALT(stat)       \
+    do {                               \
+        stat = IO_READ(PI_STATUS_REG); \
+    } while (stat & (PI_STATUS_IO_BUSY | PI_STATUS_DMA_BUSY))
 
-#pragma GLOBAL_ASM("asm/us/nonmatchings/main/O2/70100/func_8006F500.s")
+#define ADDRESS_1 (PI_DOM1_ADDR2 + 0x458) // 0x10000458
+#define ADDRESS_2 (PI_DOM1_ADDR2 + 0x45C) // 0x1000045C
+
+void func_8006F500(void) {
+    register u32 stat;
+    u16 addr1Val;
+    u16 addr2Val;
+
+    WAIT_ON_IOBUSY_ALT(stat);
+    addr1Val = IO_READ(ADDRESS_1);
+
+    WAIT_ON_IOBUSY_ALT(stat);
+    addr2Val = IO_READ(ADDRESS_2);
+
+    D_80108620 = (addr1Val << 16) | addr2Val;
+}