superg wrote:
Link83 wrote:
I understand, but since you are currently redesigning the gscartsw for RGsB might you also consider adding RGBHV support over SCART? SCART Pin 10 could carry HSYNC, and Pin 12 could carry VSYNC, and then it could output ouput RGBS (and/or RGBHV). That way with a simple SCART adapter the gscartsw could be used as a VGA switch/sync combiner as well?
There is no advantage in having separate HV sync, it's not improving the picture, just using two wires instead of one. Using digital pins to pass analog signals is not very nice and standard, apart from you'll need custom adapters to VGA or whatever you want to use (BNC?). Too cumbersome configuration. The clean solution is to mix HV sync to composite sync before entering the switch - there are even ready made devices that do exactly this, Micomsoft XSYNC and I think beharius has some device for that.
I dont want separate sync, I realise there is no advantage. However some consoles only output HSYNC and VSYNC for 480p, such as the Dreamcast, and (with a two wire mod) the PS2 and Xbox. I'm only thinking it would add greater flexibility to the gscartsw design.
To my knowledge SCART Pins 10 and 12 have very rarely been used, and no game consoles SCART cables ever used them. The commercially available Keene SCART Commander used pins 10 and 12 for HSYNC and VSYNC input. On the output side I would be happy with just RGBS (CSYNC on pin 20) but if you wanted there could also be a small switch to enable/disable HSYNC/VSYNC output over SCART pins 10/12.
As far as I can tell through google the Micomsoft XSYNC1 was a CSYNC separator? (and apparently its no longer sold) The Beharbros design also has some "critical design flaws":-
viewtopic.php?f=6&t=61472Guspaz wrote:
It generates an invalid csync signal for the SCART port because it just XNORs the H and V sync together, which is incorrect and won't work properly with many digital devices like the OSSC.
If you know of any other quality sync combiners I would love to know about them
Anyway, it was just an idea which I though some people would find useful.