Neotec S501 sync timings help

spoonelli

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Donor 6 years: 2016, 2019-2021, 2023-2024
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I'm having the dardnest times with "non-standard" timed games on my neotec S501 (converted an ultimate arcade 2+ to jamma), running Advmame off a pi2jamma.

games that are impacted include stuff like tapper and nba jam/mk, which i know use funky timings...

my wells monitors with the exact same setup (pi2jamma) in other cabinets don't have a problem with them.

are there any jumpers/settings i might want to muck with? does anyone have documentation/schematics that might help?

keep in mind most 15khz games/resolutions work ok (cps games have some top bend in the screen)...

thx!
 

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looks like this jumped sync pin might have something to do with it??
 

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update here - played around with sync pins (disconnected H, then V) and made no difference. There are a ton of adjustment pots on the monitor's chassis itself but i'm hesitating to start playing around with em given that most 320x240 games work fine...
 
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