SEGA Genesis model 2 S-Video mod

[dhau]

Hi folks, I had several CXA2075M chips laying around, and I finally decided to give it a try with regular model 2 Genesis, that comes with Samsung chip with no chroma/lumina. I replaced KA2195D with CXA2075M, soldering all the pins except for all marked NC in CXA2075M datasheet and the Y/C pins (15 and 16). After this I just glued an S-Video female connector to the motherboard right next to existing A/V connector using some epoxy. I connected pins 15 and 16 to S-Video via 75 Ohm resistors and 220uF capacitors, and voila! Nothig worked. So I switched pins, and this time everything worked great.

The S-Video output quality is amazing. Even composite video out with CXA2075M appears to be better then with Sammy KA2195D. However there is a downside. For unknown reason, sound is now a bit "overloaded". Or may be it's just me. It sounds almost normal, but like it went through an overloaded amplifier. Bizzare.

Anyway. If you have a spare CXA1645 or CXA2075M chip, some time and fair soldering skills, you can easily add S-Video to any model 2 Genesis console.

 

[Mask of Destiny]

Hi folks, I had several CXA2075M chips laying around, and I finally decided to give it a try with regular model 2 Genesis, that comes with Samsung chip with no chroma/lumina.

So that's why they say you can't do a S-Video mod on a Genesis 2 without extra stuff. I've always been confused because my Gen 2 has a CXA family chip with the Y and C outputs.

 

[dhau]

Originally posted by Mask of Destiny@Mon, 2005-11-07 @ 10:19 AM

So that's why they say you can't do a S-Video mod on a Genesis 2 without extra stuff. I've always been confused because my Gen 2 has a CXA family chip with the Y and C outputs.

[post=141456]Quoted post[/post]​

You're lucky, I think SEGA switched from Samsung to Sony in 1996, and all you need to do is lift pins 15/16 then solder a 75 Ohm resistance and 220uF capacitor to each, and you have your S-Video.

 

[computolio]

How did you get your hands on a CXA2075 chip? Did you have to scavenge something?

 

[Chilly Willy]

Originally posted by dhau@Sun, 2005-11-06 @ 10:56 PM

The S-Video output quality is amazing.

If you think S-Video looks good, you should get an RGB cable and hook it to a monitor. Now THAT looks awesome! I had an RGB + stereo audio cable custom made by Monster Cable years ago. It was worth every penny.

:banana

 

[dhau]

Originally posted by computolio@Mon, 2006-01-23 @ 03:19 AM

How did you get your hands on a CXA2075 chip? Did you have to scavenge something?

[post=143703]Quoted post[/post]​

I ordered them for 2$ a piece from my friend in Moscow: www.nedopc.com (WARNING! Russian)

 

[dhau]

Originally posted by Chilly Willy@Wed, 2006-01-25 @ 09:13 PM

If you think S-Video looks good, you should get an RGB cable and hook it to a monitor. Now THAT looks awesome! I had an RGB + stereo audio cable custom made by Monster Cable years ago. It was worth every penny.

In US and Canada, we don't have RGB inputs in our tellies. So S-Video is the only way to go. I have XRGB2+ and cable for Genesis Mk1 and Mk2, as well as SEGA Teradrive PC, that plays Genesis games on VGA monitor natively. But I would'n say it's any better then S-Video on my 27" CRT Sony.

 

[Raijin Z]

Originally posted by "dhau"

In US and Canada, we don't have RGB inputs in our tellies. So S-Video is the only way to go.

What? Two of the three TVs in my house have RGB input. They were made in the past three years though.

 

[dhau]

Originally posted by Raijin Z@Sun, 2006-04-23 @ 11:30 AM

What? Two of the three TVs in my house have RGB input. They were made in the past three years though.

[post=145862]Quoted post[/post]​

Good point. You probably reffering to VGA-in, that was avalable on many "HDTV-ready" TVs (pre-HDMI). I still use a 27" Sony CRT SDTV from 2001, so I know little about this. I am not sure how well those inputs perform with classic non-progressive scan RGB devices, such as SEGA Genesis, SNES etc.

Do you use your TV VGA input with SEGA Genesis? If yes, how does it work?