Some more tweaks

src/m4a.c

@@ -315,7 +315,7 @@ void MPlayExtender(struct CgbChannel *cgbChans)
 
 void MusicPlayerJumpTableCopy(void)
 {
-    asm("swi 0x2A");
+    asm("svc 0x2A");
 }
 
 void ClearChain(void *x)

src/main.c

@@ -298,7 +298,7 @@ void InitIntrHandlers(void)
 
     REG_IME = 1;
 
-    EnableInterrupts(0x1);
+    EnableInterrupts(INTR_FLAG_VBLANK);
 }
 
 void SetVBlankCallback(IntrCallback callback)