diff -Nru src-old/mame/drivers/segag80v.c src/mame/drivers/segag80v.c
--- src-old/mame/drivers/segag80v.c	2012-02-19 18:58:00.000000000 +0100
+++ src/mame/drivers/segag80v.c	2012-02-21 16:12:46.000000000 +0100
@@ -926,6 +926,10 @@
 
 static MACHINE_CONFIG_DERIVED( elim2, g80v_base )
 
+	/* video hardware */
+	MCFG_SCREEN_MODIFY("screen")
+	MCFG_SCREEN_VISIBLE_AREA(511, 1537, 508, 1536)
+
 	/* custom sound board */
 	MCFG_SAMPLES_ADD("samples", elim2_samples_interface)
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
@@ -934,6 +938,10 @@
 
 static MACHINE_CONFIG_DERIVED( spacfury, g80v_base )
 
+	/* video hardware */
+	MCFG_SCREEN_MODIFY("screen")
+	MCFG_SCREEN_VISIBLE_AREA(511, 1535, 508, 1537)
+
 	/* custom sound board */
 	MCFG_SAMPLES_ADD("samples", spacfury_samples_interface)
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.10)
@@ -945,6 +953,10 @@
 
 static MACHINE_CONFIG_DERIVED( zektor, g80v_base )
 
+	/* video hardware */
+	MCFG_SCREEN_MODIFY("screen")
+	MCFG_SCREEN_VISIBLE_AREA(511, 1537, 510, 1536)
+
 	/* custom sound board */
 	MCFG_SAMPLES_ADD("samples", zektor_samples_interface)
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.10)
@@ -959,6 +971,10 @@
 
 static MACHINE_CONFIG_DERIVED( tacscan, g80v_base )
 
+	/* video hardware */
+	MCFG_SCREEN_MODIFY("screen")
+	MCFG_SCREEN_VISIBLE_AREA(508, 1536, 507, 1537)
+
 	/* universal sound board */
 	MCFG_FRAGMENT_ADD(sega_universal_sound_board)
 MACHINE_CONFIG_END
@@ -966,6 +982,10 @@
 
 static MACHINE_CONFIG_DERIVED( startrek, g80v_base )
 
+	/* video hardware */
+	MCFG_SCREEN_MODIFY("screen")
+	MCFG_SCREEN_VISIBLE_AREA(510, 1537, 507, 1534)
+
 	/* speech board */
 	MCFG_FRAGMENT_ADD(sega_speech_board)