diff --git a/src/mame/drivers/vt100.cpp b/src/mame/drivers/vt100.cpp
index 447e4b065e3..986a8f10d03 100644
--- a/src/mame/drivers/vt100.cpp
+++ b/src/mame/drivers/vt100.cpp
@@ -413,10 +413,8 @@ static MACHINE_CONFIG_START( vt100 )
 
 	/* video hardware */
 	MCFG_SCREEN_ADD_MONOCHROME("screen", RASTER, rgb_t::green())
-	MCFG_SCREEN_REFRESH_RATE(60)
-	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
-	MCFG_SCREEN_SIZE(80*10, 25*10)
-	MCFG_SCREEN_VISIBLE_AREA(0, 80*10-1, 0, 25*10-1)
+	MCFG_SCREEN_RAW_PARAMS(XTAL_24_0734MHz*2/3, 102*10, 0, 80*10, 262, 0, 25*10)
+	//MCFG_SCREEN_RAW_PARAMS(XTAL_24_0734MHz, 170*9, 0, 132*9, 262, 0, 25*10)
 	MCFG_SCREEN_UPDATE_DRIVER(vt100_state, screen_update_vt100)
 	MCFG_SCREEN_PALETTE("vt100_video:palette")