supergun rolling picture / sync problems

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mx5dob
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supergun rolling picture / sync problems

Post by mx5dob » April 5th, 2019, 12:20 pm

Hi all. Im attempting to play 2 vertical jamma pcbs on my supergun:

https://www.smallcab.net/smallcab-super ... anguage=en

But the screen constantly rolls and wont keep still. There doesn't seem to be any way to adjust the vertical/horizontal hold on the supergun and i'm using a standard CRT tv so I can adjust any pots on that.
Can anyone suggest a 'plug and play' solution? (i'm not technically minded enough to mod the supergun)

Something like this that would attach between the supergun and jamma pcb:

https://translate.google.co.uk/translat ... &sandbox=1

or even a scart cable with adjustable pots...

Thanks,
Paul

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JoeAwesome
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Re: supergun rolling picture / sync problems

Post by JoeAwesome » April 6th, 2019, 3:37 am

What games? Raiden?

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mx5dob
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Re: supergun rolling picture / sync problems

Post by mx5dob » April 6th, 2019, 1:18 pm

Hi. It's last duel by capcom.and thunder Dragon by nmk

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Re: supergun rolling picture / sync problems

Post by JoeAwesome » April 8th, 2019, 8:01 pm

It's probably not the refresh rates.

Are the PCBs getting 5v, or thereabouts? Does the CRT have any issues with other vertical games, or even horizontal games when the CRT is rotated? I wonder if the CRT has issues with the rotation.

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Re: supergun rolling picture / sync problems

Post by mx5dob » April 10th, 2019, 3:06 pm

They are getting 5v and my other vertical pcbs work fine (raiden fighters, esp ra.de and sonic wings)

any other ideas?

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Re: supergun rolling picture / sync problems

Post by SuperPang » April 11th, 2019, 12:19 pm

It might be worth looking for a Sony PVM or similar locally as I believe they have V-Hold pots.

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Re: supergun rolling picture / sync problems

Post by mx5dob » April 11th, 2019, 12:21 pm

cool. Getting a PVM is on the cards anyway :)

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