diff --git a/src/inc/interface.h b/src/inc/interface.h
new file mode 100644
index 0000000..0e74d2f
--- /dev/null
+++ b/src/inc/interface.h
@@ -0,0 +1,8 @@
+#ifndef _APPLE_I_INTERFACE_H_
+#define _APPLE_I_INTERFACE_H_
+
+void io_init(void);
+void input(void);
+void output(void);
+
+#endif
\ No newline at end of file