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Author Topic: Arcade monitor issues with Rampage World Tour  (Read 2341 times)

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thewumpus

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Arcade monitor issues with Rampage World Tour
« on: May 02, 2018, 05:06:11 pm »
So I've finally found a 400x254 modeline that works great in Arcade OSD on my WG 4600 arcade monitor (8.18 400 416 456 520 254 262 265 288 -hsync -vsync).  But when I actually run Rampage World Tour on MAME, I get wavy lines as in the attached JPG.

I'm running GroovyMame on Windows XP (MAME 0.171, SwitchRes 0.015m, ArcadeOSD 1.4).  Any ideas why it would work in Arcade OSD but not in MAME?  Is my mode (400x254 @ 54.621) somehow not close enough to the resolution MAME wants for this game (400x254 @ 54.706841)?  If so, any suggestions for fine-tuning?

Thanks!

EDIT: Note that bumping the dot clock up to 8.19 (for a final refresh rate of 54.688) didn't seem to improve things.
« Last Edit: May 02, 2018, 05:27:28 pm by thewumpus »

Calamity

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Re: Arcade monitor issues with Rampage World Tour
« Reply #1 on: May 03, 2018, 06:20:35 am »
You probably need to adjust the H-freq (or H-hold) potentiometer, slightly.
Important note: posts reporting GM issues without a log will be IGNORED.
Steps to create a log:
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 - Attach resulting romname.txt file to your post, instead of pasting it.

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Malenko

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Re: Arcade monitor issues with Rampage World Tour
« Reply #2 on: May 03, 2018, 08:26:45 am »
You probably need to adjust the H-freq (or H-hold) potentiometer, slightly.

^This.  Midway games are like that, and I mean actual PCBs.  Most of the times I've swapped between a Midway game and a non-Midway game , the Hfreq needs adjusting.
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thewumpus

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Re: Arcade monitor issues with Rampage World Tour
« Reply #3 on: May 06, 2018, 11:29:44 am »
That fixed it!  Thanks, guys!!