Modding Dreamcast's VGA Box for (both modes of) 15khz RGB

[Superior Sephiroth]

I would like to mod Dreamcast's VGA Box to add to it both modes of 15khz RGB. As I understand I would need to install 2 switches, one on pin6 and other on pin7 to connect and disconnect them from the ground. This way I could have all possible video modes in a single box. How to do it and how to find pin6 and pin7?

[matt]

Use the continuity test on your multimeter to check what wires on the inside of the box correspond with the pins on the Dreamcast connector.

[Superior Sephiroth]

My Dreamcast VGA Box now:
https://ibb.co/5Bz8R23

[PC Engine Fan X!]

I thought your DC VGA Box was the official one released/sold by Sega. It's quite pricey nowadays indeed.

PC Engine Fan X! ^_~

[kitty666cats]

Hell yeah! I like your choice for the switches, sephiroth. Are you blessed enough to use a VGA cable out into a multi sync monitor? Or do you send the signal to a scaler (or something like that)

[BazookaBen]

My Dreamcast VGA Box now:
https://ibb.co/5Bz8R23

Wait, I'm confused, what are "both modes" of 15kHz RGB?

I thought you only need one switch, since there's already a TV<>PC switch to go between the "TV side" (with s-video, etc) at 15kHz and the "PC side" at 31kHz. And the added switch is just to allow the PC side to output at 15kHz

[kitty666cats]

My Dreamcast VGA Box now:
https://ibb.co/5Bz8R23

Wait, I'm confused, what are "both modes" of 15kHz RGB?

I thought you only need one switch, since there's already a TV<>PC switch to go between the "TV side" (with s-video, etc) at 15kHz and the "PC side" at 31kHz. And the added switch is just to allow the PC side to output at 15kHz

Maybe they added a sync combiner for 15kHz output and that’s what one switch is for…? That’s my best guess, heh