diff --git a/src/plat-serial.h b/src/plat-serial.h
new file mode 100644
index 000000000..e11737a89
--- /dev/null
+++ b/src/plat-serial.h
@@ -0,0 +1,49 @@
+/*
+ * 86Box	A hypervisor and IBM PC system emulator that specializes in
+ *		running old operating systems and software designed for IBM
+ *		PC systems and compatibles from 1981 through fairly recent
+ *		system designs based on the PCI bus.
+ *
+ *		This file is part of the 86Box distribution.
+ *
+ *		Definitions for the Bottom Half of the SERIAL card.
+ *
+ * Version:	@(#)plat-serial.h	1.0.3	2017/05/06
+ *
+ * Author:	Fred N. van Kempen, <decwiz@yahoo.com>
+ *		Copyright 2017 Fred N. van Kempen.
+ */
+#ifndef PLAT_SERIAL_H
+# define PLAT_SERIAL_H
+
+
+typedef struct {
+    char	name[79];		/* name of open port */
+    void	(*rd_done)(void *, int);
+    void	*rd_arg;
+#ifdef BHTTY_C
+    HANDLE	handle;
+    OVERLAPPED	rov,			/* READ and WRITE events */
+		wov;
+    int		tmo;			/* current timeout value */
+    DCB		dcb,			/* terminal settings */
+		odcb;
+#endif
+} BHTTY;
+
+
+extern BHTTY	*bhtty_open(char *__port, int __tmo);
+extern void	bhtty_close(BHTTY *);
+extern int	bhtty_flush(BHTTY *);
+extern void	bhtty_raw(BHTTY *, void *__arg);
+extern int	bhtty_speed(BHTTY *, long __speed);
+extern int	bhtty_params(BHTTY *, char __dbit, char __par, char __sbit);
+extern int	bhtty_sstate(BHTTY *, void *__arg);
+extern int	bhtty_gstate(BHTTY *, void *__arg);
+extern int	bhtty_crtscts(BHTTY *, char __yesno);
+
+extern int	bhtty_write(BHTTY *, unsigned char);
+extern int	bhtty_read(BHTTY *, unsigned char *, int);
+
+
+#endif	/*PLAT_SERIAL_H*/