diff --git a/src/mame/drivers/oric.cpp b/src/mame/drivers/oric.cpp
index 28f08f5a354..dd259e2c075 100644
--- a/src/mame/drivers/oric.cpp
+++ b/src/mame/drivers/oric.cpp
@@ -775,10 +775,7 @@ static MACHINE_CONFIG_START( oric )
 
 	/* video hardware */
 	MCFG_SCREEN_ADD("screen", RASTER)
-	MCFG_SCREEN_REFRESH_RATE(60)
-	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
-	MCFG_SCREEN_SIZE(40*6, 28*8)
-	MCFG_SCREEN_VISIBLE_AREA(0, 40*6-1, 0, 28*8-1)
+	MCFG_SCREEN_RAW_PARAMS(XTAL_12MHz/2, 64*6, 0, 40*6, 312, 0, 28*8) // 260 lines in 60 Hz mode
 	MCFG_SCREEN_UPDATE_DRIVER(oric_state, screen_update_oric)
 	MCFG_SCREEN_VBLANK_CALLBACK(WRITELINE(oric_state, vblank_w))