diff --git a/config/dol_slices.yml b/config/dol_slices.yml
index 0de8e347..4e73148b 100644
--- a/config/dol_slices.yml
+++ b/config/dol_slices.yml
@@ -84,6 +84,8 @@ jaudio_NES/internal/neosthread.c:
     .bss: [0x80180020, 0x80186440]
     .sdata: [0x80217be0, 0x80217be8]
     .sbss: [0x80218460, 0x80218478]
+jaudio_NES/internal/os.c:
+    .text: [0x80026120, 0x80026300]
 Famicom/famicom.cpp:
     .text: [0x80041614, 0x80046888] # TODO: get ~J2DOrthoGraph's dtor in here somehow? 0x800468fc, also add in JUTGamePad::getPortStatus when JUTGamePad is linked?
     .rodata: [0x800aa9a8, 0x800aaa30]
diff --git a/include/jaudio_NES/os.h b/include/jaudio_NES/os.h
index 6e9bd107..104defb5 100644
--- a/include/jaudio_NES/os.h
+++ b/include/jaudio_NES/os.h
@@ -4,6 +4,14 @@
 #include "types.h"
 #include "libultra/libultra.h"
 
-extern int Z_osSendMesg(OSMesgQueue* mq, OSMesg msg, s32 block);
+extern void Z_osWritebackDCacheAll();
+extern void osInvalDCache2(void* src, s32 size);
+extern void osWritebackDCache2(void* src, s32 size);
+extern void Z_osCreateMesgQueue (OSMesgQueue* mq, OSMesg* msg, s32 count );
+extern s32 Z_osSendMesg(OSMesgQueue* mq, OSMesg msg, s32 flags );
+extern s32 Z_osRecvMesg(OSMesgQueue* mq, OSMesg* msg, s32 flags );
+extern s32 Z_osEPiStartDma (OSPiHandle * handler, OSIoMesg* msg, s32 dir);
+extern void Z_bcopy (void* dst, void* src, size_t size);
+
 
 #endif
diff --git a/include/libultra/osMesg.h b/include/libultra/osMesg.h
index 7ffaff64..fa4524f3 100644
--- a/include/libultra/osMesg.h
+++ b/include/libultra/osMesg.h
@@ -5,12 +5,15 @@
 #include "dolphin/os/OSThread.h"
 #include "dolphin/os/OSMessage.h"
 
+#define OS_MESG_NOBLOCK     0
+#define OS_MESG_BLOCK       1
+
 typedef void* OSMesg;
 
 typedef struct OSMesgQueue_s {
     /* 0x00 */ OSThread* mtqueue;
     /* 0x04 */ OSThread* fullqueue;
-    /* 0x08 */ int validCount;
+    /* 0x08 */ volatile int validCount;
     /* 0x0C */ int first;
     /* 0x10 */ int msgCount;
     /* 0x14 */ OSMesg* msg;
diff --git a/src/static/jaudio_NES/internal/os.c b/src/static/jaudio_NES/internal/os.c
new file mode 100644
index 00000000..3a90a066
--- /dev/null
+++ b/src/static/jaudio_NES/internal/os.c
@@ -0,0 +1,82 @@
+#include "jaudio_NES/os.h"
+#include "dolphin/os.h"
+#include "jaudio_NES/dummyrom.h"
+#include "jaudio_NES/sample.h"
+
+
+extern void Z_osWritebackDCacheAll(){
+    
+}
+
+extern void osInvalDCache2(void* src, s32 size){
+    DCInvalidateRange(src,size);
+}
+
+extern void osWritebackDCache2(void* src, s32 size){
+    DCStoreRange(src,size);
+}
+
+extern void Z_osCreateMesgQueue (OSMesgQueue* mq, OSMesg* msg, s32 count ){
+    mq->msg = msg;
+    mq->msgCount = count;
+    mq->validCount = 0;
+    mq->first = 0;
+}
+
+extern s32 Z_osSendMesg(OSMesgQueue* mq, OSMesg msg, s32 flags ){
+    int msgCount = mq->msgCount;
+    if (mq->validCount == mq->msgCount) {
+        return -1;
+    }
+
+    int count =  mq->first + mq->validCount;
+
+    if(count >= mq->msgCount){
+        count -= mq->msgCount; 
+    }
+
+    mq->msg[count] = msg;
+
+    mq->validCount++;
+
+    return 0;
+}
+
+extern s32 Z_osRecvMesg(OSMesgQueue* mq, OSMesg* msg, s32 flags ){
+    if(flags == OS_MESG_BLOCK){
+        while(!mq->validCount){
+            
+        };
+    }
+
+    if(mq->validCount == 0){
+        if(msg != NULL){
+            *msg = NULL;
+        }
+        return -1;
+    }
+
+    mq->validCount -= 1;
+
+    if(msg != NULL){
+        *msg = mq->msg[mq->first];
+    }
+
+    mq->first++;
+
+    if(mq->first == mq->msgCount){
+        mq->first = 0;
+    }
+
+    return 0;
+    
+}
+
+extern s32 Z_osEPiStartDma (OSPiHandle * handler, OSIoMesg* msg, s32 dir){
+    ARAMStartDMAmesg(1, (uintptr_t)msg->dramAddr, msg->devAddr, msg->size, 0, msg->hdr.retQueue);
+    return 0;
+}
+
+void Z_bcopy (void* dst, void* src, size_t size){
+    Jac_bcopy(dst,src,size);
+}
\ No newline at end of file