diff --git a/src/mame/drivers/tutankhm.c b/src/mame/drivers/tutankhm.c
index 0e8775df4b5..ef8aaf5f65e 100644
--- a/src/mame/drivers/tutankhm.c
+++ b/src/mame/drivers/tutankhm.c
@@ -18,6 +18,34 @@
     * Discrete filters
     * Starfield
 
+
+	Custom Chip 084 (Starfield generation)
+
+	* Inputs:
+	*
+	*      NE555 ==> 10	(approx 1 HZ)
+	*       401  ==>  1  (crystal clock, most likely around 6 MHz)
+	*       109  ==>  2  (Video related)
+	*       403  ==>  3  (Video related)
+	*       403  ==>  4  (Video related)
+	*       405  ==>  5  (Video related)
+	*       406  ==>  6  (Video related)
+	*       420  ==> 20  (Video related)
+	*       421  ==> 21  (Video related)
+	*       422  ==> 22  (Video related)
+	*       423  ==> 23  (Video horizontal signal H1)
+	*0x8206 HFF  ==>  7	(Horizontal flip)
+	*0x8204 407  ==>  8  (Enable ???)
+	*
+	*Outputs:
+	*	13		Red
+	*	14		Red
+	*	15		Green
+	*	16		Green
+	*	17		Blue
+	*	18		Blue
+
+
 ***************************************************************************/
 
 #include "emu.h"