1 files changed, 4 insertions, 0 deletions
diff --git a/opl/opl.h b/opl/opl.h
index 515950b1..3413e3ab 100644
--- a/opl/opl.h
+++ b/opl/opl.h
@@ -88,5 +88,9 @@ void OPL_Lock(void);
 
 void OPL_Unlock(void);
 
+// Block until the specified number of milliseconds have elapsed.
+
+void OPL_Delay(unsigned int ms);
+
 #endif