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Author Topic: PC Engine / Turbografx16 s-video mod  (Read 1796 times)

Drakon

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Re: PC Engine / Turbografx16 s-video mod
« Reply #15 on: July 25, 2012, 11:08:44 PM »
Revised circuit:









New demo capture:
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Drakon

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Re: PC Engine / Turbografx16 s-video mod
« Reply #16 on: July 26, 2012, 11:47:16 PM »
Question, since I disconnected luma from the composite video circuit is it still necessary to use a capacitor to "filter out" the chroma signal?
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NightWolve: "I'd say ole XGay fears another relapse, hence the need for strong, daily hetero reinforcement on his desktop. ;)"

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thesteve

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Re: PC Engine / Turbografx16 s-video mod
« Reply #17 on: July 27, 2012, 03:32:55 AM »
no its not
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Bernie

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Re: PC Engine / Turbografx16 s-video mod
« Reply #18 on: July 27, 2012, 03:37:48 AM »
Damn.   I want this done now.
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Drakon

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Re: PC Engine / Turbografx16 s-video mod
« Reply #19 on: July 27, 2012, 05:41:07 AM »
Quote from: Bernie on July 27, 2012, 03:37:48 AM
Damn.   I want this done now.

It's really easy and the results are nothing but perfection.  You can hire myself or thesteve if he's up to it.  I'm posting this on a few places so it's more known.  I honestly didn't even know the mod even existed until after I followed some schematic of the video circuit and wired up something myself.
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NightWolve: "I'd say ole XGay fears another relapse, hence the need for strong, daily hetero reinforcement on his desktop. ;)"

Jibbajaba: "The problem with trying to flame Regal is that it's like trying to gut-punch a really fat person."

Bernie

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Re: PC Engine / Turbografx16 s-video mod
« Reply #20 on: July 27, 2012, 05:43:25 AM »
Ill get with one of yall soon.
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SNKNostalgia

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Re: PC Engine / Turbografx16 s-video mod
« Reply #21 on: July 27, 2012, 01:12:36 PM »
Anybody know how the picture differs from an external S-video mod from D-Lite or grahf's improved version?
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Duo_R

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Re: PC Engine / Turbografx16 s-video mod
« Reply #22 on: July 27, 2012, 01:39:59 PM »
Those mods use a video encoder chip CXA1645 to convert RGB TO Svideo. This diagram uses existing signals and builds it to useable Svideo signal. This method if proven stable is a cheaper solution.

Also is RGB still useable after this mod?
« Last Edit: July 27, 2012, 01:41:56 PM by Duo_R »
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thesteve

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Re: PC Engine / Turbografx16 s-video mod
« Reply #23 on: July 27, 2012, 02:32:18 PM »
yes, RGB will not be changed by this
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SNKNostalgia

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Re: PC Engine / Turbografx16 s-video mod
« Reply #24 on: July 27, 2012, 03:51:52 PM »
Yep, I know about the board having an RGB amp then converted to S-Video with a CXA1645 or a CXA2075 in my case  :twisted:

Is the S-video picture quality the same is what I am wondering?
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thesteve

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Re: PC Engine / Turbografx16 s-video mod
« Reply #25 on: July 27, 2012, 04:08:52 PM »
the quality may be the same, but the color space is different
this way preserves the PCE tuned color space, whereas RGB to S-Vid skips the tuning
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Duo_R

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Re: PC Engine / Turbografx16 s-video mod
« Reply #26 on: July 27, 2012, 04:42:36 PM »
ah sorry man misread what you wrote there. Yeah it would be nice to see a side by side comparison.

Quote from: SNKNostalgia on July 27, 2012, 03:51:52 PM
Yep, I know about the board having an RGB amp then converted to S-Video with a CXA1645 or a CXA2075 in my case  :twisted:

Is the S-video picture quality the same is what I am wondering?
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Drakon

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Re: PC Engine / Turbografx16 s-video mod
« Reply #27 on: July 27, 2012, 10:51:02 PM »
The s-video generated by the console is absolutely beautiful I can pretty much gaurantee it looks better than externally encoding the rgb into s-video.
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SNKNostalgia

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Re: PC Engine / Turbografx16 s-video mod
« Reply #28 on: July 28, 2012, 06:55:46 AM »
I find it funny how it took till now to just simply tap S-Video out of the system with just 2 parts. All these damn years, lol.

I remember saving up for region/S-video on my practically new US Duo and finally finding someone to do it (grahf) back in 2006. Glad I got 2 nice clean modded boards in there. Looks like manufactured quality parts instead of homemade pcb setups.
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Drakon

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Re: PC Engine / Turbografx16 s-video mod
« Reply #29 on: July 28, 2012, 08:05:16 AM »
Having the circuit diagram of the video signals made this mod super easy so we should thank whoever bothered figuring it out.
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NightWolve: "I'd say ole XGay fears another relapse, hence the need for strong, daily hetero reinforcement on his desktop. ;)"

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