fandangos wrote:
I actually have the official scart cable for the dreamcast.
As I can see in your setup the Torobox when receiving H and V sync will combine those for Csync?
Is that the reason you have RGBS all the time?
What I'm thinking here is, if I use the Scart cable, just add the switch to toggle VGA mode is the OSSC capable of working with 480p that way?
I guess there might be a situation with Sync since 31Khz standard uses H and V sync instead of Csync.
Yes, the Toro has a sync combiner to convert the RGBHV from the Dreamcast into RGBS, which is needed to use the Toro's SCART output. I leave my Toro in RGBS mode and use SCART because a) of the aforementioned benefit of having that visual cue to flip the video mode switch, and b) I intend to add an automatic SCART switch to my setup later this year, and the Toro's SCART output would be easier to integrate into that kind of setup.
You would not be able to use the official SCART cable to get 480p. The Dreamcast only outputs 480p in RGBHV mode, and SCART was not designed to accommodate the separate horizontal and vertical sync signals. You would need to add a sync combiner circuit in addition to the mode switch.
Also, the kHz 'standard' has no bearing on use of composite or separate sync; you should be able to use either method for any combination of resolution and refresh rate. It's possible that, as is rumored with the Xbox, the hardware intentionally restricts native RGB SCART output to standard-definition video (480i max) as to not damage SD-only CRT televisions that do not and/or cannot understand 480p. There is no physical or technical limitation preventing 480p (or even 720i/p or 1080i/p) RGBS from being transmitted over a SCART cable, as long as the receiving end (like a TV or OSSC) can understand the signal.
Personally, I wouldn't bother modifying that official cable, because it's not worth the effort when you can simply buy a preassembled product, like the Toro, or even a cable (like those made by thefoo.83 on eBay), that would ostensibly do the job correctly out of the box; not to mention you would be destroying what is now arguably a collector's item. I would hang onto the official SCART cable, either displaying it on a shelf, or reselling it to someone else, and saving your money for a Toro or a VGA cable with a sync combiner (if you intend to use your Dreamcast on an old CRT) or for the upcoming DreamcastHDMI mod.