diff -Nru old/src/mame/drivers/astrocde.c new/src/mame/drivers/astrocde.c
--- old/src/mame/drivers/astrocde.c	2010-02-14 22:40:38.000000000 +0100
+++ new/src/mame/drivers/astrocde.c	2010-03-08 23:00:06.000000000 +0100
@@ -1284,7 +1284,7 @@
 	MDRV_SCREEN_ADD("screen", RASTER)
 	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
 	MDRV_SCREEN_RAW_PARAMS(ASTROCADE_CLOCK, 455, 0, 352, 262, 0, 240)
-	MDRV_SCREEN_DEFAULT_POSITION(1.1, 0.0, 1.18, -0.018)	/* clip out borders */
+	MDRV_SCREEN_DEFAULT_POSITION(1.1, -0.05, 1.182, -0.110)	/* clip out borders */
 
 	MDRV_PALETTE_INIT(astrocde)
 	MDRV_VIDEO_START(astrocde)
diff -Nru old/src/mame/video/cidelsa.c new/src/mame/video/cidelsa.c
--- old/src/mame/video/cidelsa.c	2010-01-28 13:14:18.000000000 +0100
+++ new/src/mame/video/cidelsa.c	2010-03-08 23:29:04.000000000 +0100
@@ -254,7 +254,7 @@
 
 MACHINE_DRIVER_START( destryer_video )
 	MDRV_CDP1869_SCREEN_PAL_ADD(SCREEN_TAG, DESTRYER_CHR2)
-	MDRV_SCREEN_DEFAULT_POSITION(1.226, 0.012, 1.4, 0.044)
+	MDRV_SCREEN_DEFAULT_POSITION(1.226, -0.102, 1.4, 0.244)
 
 	MDRV_VIDEO_START(cidelsa)
 	MDRV_VIDEO_UPDATE(cidelsa)
@@ -266,7 +266,7 @@
 
 MACHINE_DRIVER_START( altair_video )
 	MDRV_CDP1869_SCREEN_PAL_ADD(SCREEN_TAG, ALTAIR_CHR2)
-	MDRV_SCREEN_DEFAULT_POSITION(1.226, 0.012, 1.4, 0.044)
+	MDRV_SCREEN_DEFAULT_POSITION(1.226, -0.102, 1.4, 0.244)
 
 	MDRV_VIDEO_START(cidelsa)
 	MDRV_VIDEO_UPDATE(cidelsa)
@@ -278,7 +278,7 @@
 
 MACHINE_DRIVER_START( draco_video )
 	MDRV_CDP1869_SCREEN_PAL_ADD(SCREEN_TAG, DRACO_CHR2)
-	MDRV_SCREEN_DEFAULT_POSITION(1.226, 0.012, 1.360, 0.024)
+	MDRV_SCREEN_DEFAULT_POSITION(1.226, -0.102, 1.360, 0.204)
 
 	MDRV_VIDEO_START(draco)
 	MDRV_VIDEO_UPDATE(cidelsa)