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-rw-r--r--src/mame/drivers/prehisle.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/src/mame/drivers/prehisle.c b/src/mame/drivers/prehisle.c
index eb98e6b6683..7a384a033cb 100644
--- a/src/mame/drivers/prehisle.c
+++ b/src/mame/drivers/prehisle.c
@@ -205,10 +205,10 @@ static MACHINE_CONFIG_START( prehisle, prehisle_state )
/* 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(32*8, 32*8)
- MCFG_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 2*8, 30*8-1)
+ // the screen parameters are guessed but should be accurate. They
+ // give a theoretical refresh rate of 59.1856Hz while the measured
+ // rate on a snk68.c with very similar hardware board is 59.16Hz.
+ MCFG_SCREEN_RAW_PARAMS(XTAL_24MHz/4, 384, 0, 256, 264, 16, 240)
MCFG_SCREEN_UPDATE_DRIVER(prehisle_state, screen_update_prehisle)
MCFG_SCREEN_PALETTE("palette")