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Also, because i don't want to retype it... And this applies to your modelines in general, it's not just for GM.

there is a guide to VMM and ArcadeOSD - http://geedorah.com/eiusdemmodi/forum/viewtopic.php?id=46

VMM sets up modelines and installs them. ArcadeOSD adjusts them. And you can save the adjustments. But the switchres utility in GroovyMAME, which is where the magic happens, uses the timings in the mame.ini file. When playing with ArcadeOSD, remember that Esc will back out of any changes.

To make adjusted timings stick for GM you can either redo VMM with updated timings in the monitor.ini, or instead you can just edit the mame.ini file with the updated horizontal timings (starting with the crt_range0 line, which for the generic_15 monitor preset defaults to crt_range0 15625-15750, 49.50-65.00, 2.000, 4.700, 8.000, 0.064, 0.192, 1.024, 0, 0, 192, 288, 448, 576 - remember that your monitor may want a different preset, and that any specific vertical.ini, machine.ini like neogeo.ini, or game.ini files will override). Calamity insists redoing VMM works best, but i find that with the spread of modes i'm using (230p at 60Hz all the way up to 600i at 50Hz) on different monitors, i still want to set the mame.ini timings afterward. There's a bit about vertical sizing/timings by Calamity here.

A quick google search turns up this:
https://arcademodup.com/product/lvds-to-hdmi-adapter-board-converter-compatible-with-1080p-resolution/

but i have never used one so I can't vouch for it personally.

Thank you very very much. Glad to hear I wasn't stupid. I will check if the other midway racers behave the same.

Cruis'n World and Offroad Challange are the same driver as Cruis'n USA after all

Currently wondering on how to approach the issue in the first place.
The current system probably was made so you don't have to constantly "hold" the gear button (like a real shifter would).

You could also try disconnecting the wires completely from that one input. If it still does it, then the problem is most likely related to the ipac itself

So, i decided to try some web programming and ended up making an online daily word game. If any of you like playing wordle, maybe you want to check mine out and tell me what you think. www.verbalshift.com  This was my very first attempt at something like this.

Hello and ok I am an idiot.  please bear with me and help me.  My electrical knowledge is, I can plug stuff into the wall, and a little bit more.  I have a A1up Golden Tee Classic.  I want to remove the control board and hook up a HDMI out port to enable me to take the game and play it anywhere there is a TV or projector.  Is this possible?  What do I need?  Please help me!! Again I'm and idiot!!!

Thanks in advance!!

Cruis'n World and Offroad Challenge act exactly the same.

San Fracisco Rush can't even set to neutral and has no button assigned in mame.

First off I'm probably not the best one to try to answer this question but......  I'd start by disconnecting the coin mech, attach the wires to a spare arcade button, open notepad and one press should equal one 5. Then open the winIpac software just in case there's a repeat selection (don't know if that that's an option). Other than that make sure there's no other software installed causing this behavior. Wish I could be more help😐

Thank you very very much. Glad to hear I wasn't stupid. I will check if the other midway racers behave the same.

Just checked the MAME source - yes, kinda crap what they did there.
Nothing you can do though. I'll send in a patch to MAME.