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 The sega 32x, s-video modded

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joofcorn



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PostSubject: Re: The sega 32x, s-video modded   Thu Jun 06, 2013 7:34 pm

yes this is with the 32x and 2n3904, ignoring the fact that my colors are way off (bad svideo card for my computer, looks normal on my tv) there is some slight jailbaring, but from a distance i dont notice it too much. Even in the zoomed in square I show the jailbaring is hard to see. You posted on the sega16 forum a few months back mentioning the 2n3904 and jailbars:

"The biggest discovery is that wiring up the chroma line to a 2n3904 transistor buffer (amp?) adds jailbars to the s-video picture. For one client his tv wouldn't accept the s-video image until I amped the chroma line, but as a side effect it added jailbars to his picture."

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Drakon
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PostSubject: Re: The sega 32x, s-video modded   Thu Jun 06, 2013 8:05 pm

I don't think that's jailbars I think that's the rainbow banding

CXA1145 jailbars using a s-video circuit I honestly can't remember what the circuit was:



32x s-video:



That looks more like rainbow banding to me. Either way, the 32x is still the best thing in terms of jailbar removal for s-video.
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joofcorn



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PostSubject: Re: The sega 32x, s-video modded   Sat Jun 08, 2013 3:05 am

Heres the comparison shots from my end between coax, composite, and svideo


--Coax--


--Composite--


--SVideo


--Load screen comparison--

The rainbow banding is a little more obvious on svideo I think due to the fact that its got less blur between colors compared to composite. Where I notice the biggest advantage to svideo is how clear words come out though. Playing rpgs from composite where I can barely read words was a nightmare, so thank you for showing this mod. Maybe I'll try playing around with the circuit (maybe 100ohm trim pot to change resistance on the fly) a little to try and reduce the rainbow banding.

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Drakon
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PostSubject: Re: The sega 32x, s-video modded   Sat Jun 08, 2013 10:36 am

Any interference will become more obvious when you switch between a blurry mess and super high quality detail. I wonder if you did your mod differently than me. My capture card picks up jailbars extremely well but in my shot you can see there aren't any. I'm guessing either you did something different with your mod or your 32x is adjusted differently somehow.
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joofcorn



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PostSubject: Re: The sega 32x, s-video modded   Sat Jun 08, 2013 12:15 pm

The only thing i did differently was the 46 ohm resistor instead of the 50, but i don't think it would make that big of a difference. I think my capture card is also seeing it in more detail than on the tv I tested on so thats adding to it. For now I've just added a small amount of blur filters to soften it up. --!!Interesting note - when playing games from my sega CD through the 32x, the rainbow banding appears to me softened. Not sure what that means, maybe interference from cartridges makes it worse.
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PostSubject: Re: The sega 32x, s-video modded   Sat Jun 08, 2013 3:29 pm

Interference can come from anywhere. These signals travel across a lot of pcb before being amped. When working with the nes the more distance unamped video signals travel and the closer they are to the pcb the bigger jailbars become. I had this happen both with the nes 2 composite video mod as well as the rgb nes / famicom. With the composite video mod I could fire up the system and as I moved the unamped video wire closer to and further away from the pcb I'd watch jailbars increase and decrease on the tv while I did it. With rgb stuff in the nes adding a few inches of distance between the ppu and the video encoder chip added loads of jailbars. In some of my rgb famicom / nes systems I relocated the entire 40 pin ppu socket to be able to have the shortest distance possible between the ppu and the video encoder / rgb amp. The results of doing this made jailbars disappear enough that they no longer show up on my tv.

Genesis and master system signals I kind of stopped looking for a better solution because the 32x and my recent master system s-video mod does a good enough job for me. It's pretty much impossible to 100% get rid of jailbars on any system that has them. I've talked to tiido who's quite an expert and he said fixing it for good would require a scope, a bunch of other expensive hardware, some serious expert skills which are above my abilities, making a completely recond pcb, and probably more work than it's worth. What I do is try to find the best bandaid type solutions to clean them up as much as possible without having to redo the entire console pcb.
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