diff --git a/src/mess/drivers/banctec.c b/src/mess/drivers/banctec.c
index 645bf425fb9..54c3f05160a 100644
--- a/src/mess/drivers/banctec.c
+++ b/src/mess/drivers/banctec.c
@@ -52,6 +52,9 @@ static MACHINE_CONFIG_START( banctec, banctec_state )
 	MCFG_CPU_ADD("maincpu", M6805, 4000000)     /* 4000000? */
 	MCFG_CPU_PROGRAM_MAP(banctec_mem)
 
+// The video signal is generated by a R6545EAP character generator chip
+// The U20 EPROM holds the image data for the character set.
+
 #if 0
 	/* video hardware */
 	MCFG_SCREEN_ADD("screen", LCD)