VGA 640x480p60 source downscaled to 15khz

datamattsson commented 3 years ago

I just got one of these boards built and trying to downscale a VGA source 640x480p60 to 15khz in an arcade cabinet. This is what I end up with (video):

https://www.dropbox.com/s/mfsxjr30ulgk7wr/PXL_20210219_054200629.mp4?dl=0

The board builder told me that downscale only works with 480i which I confirmed by inserting a GBS-8100 480p to CGA 480i conversion PCB into the chain. The image is very washed out (white) even with the lowest of gains in the gbscontrol board. I rather not use the GBS-8100.

Any ideas?

datamattsson commented 3 years ago

Thanks! This looks promising. Any "over-the-counter" solutions for RGBHV to RGBS? All I find is schematics.

Danexmurder commented 3 years ago

Would love to see an image of how you wired it up. It's usually easier to tell than by just looking at a schematic.

Danexmurder commented 3 years ago

Seems like this would potentially do the trick using the parts mentioned in the schematic.

https://oshpark.com/profiles/Gcharlie84

datamattsson commented 3 years ago

Someone build me one of these! :-)

gingerbeardman commented 3 years ago

@radabass I'm getting the components together for the diagram you have posted above, but having trouble finding the exact measurement capacitors. any guidance or part numbers? can I go more or less? on which numbers? i'm a bit of a noob.

i have done a bunch of build but always of kits with components ready to go, as well as a bunch of console modding and fixing. and of course the GBS build.

thanks!

Danexmurder commented 3 years ago

I wanted to report back that I didn't have any luck using this board.

https://oshpark.com/profiles/Gcharlie84

There was no BOM listed so I set it up using all the parts from this.

https://www.epanorama.net/faq/vga2rgb/vga2rgbs_ttl.gif

Any advice would be much appreciated.

necroware commented 3 years ago

@Danexmurder this adapter seems to deliver power from DSUB pin 9. Most of the devices don't use this pin at all and also don't deliver/consume power on that pin.

mmartinezespichan commented 3 years ago

Hello, I have compile some configuracion for XBOX 360 and Dreamcast using the some information on web, I share with you please give me feedback

arcade-project.xlsx gbscontrol.zip

gingerbeardman commented 3 years ago

@mmartinezespichan I have no idea what your files are trying to show. can you please explain?

mmartinezespichan commented 3 years ago

Yes, I'm building a case for the GBSControl, I'll use for xbox 360 and dreamcast, for that I need to downscaled to 15hz and rescale to 240p.

In order to set the goal, I have read that I need to first have another input for RGBHV in order to support it in the GBS-8200.

Also, I need and output for my arcade Sega Astro City, I did the following schema, but I don't know If It is only the way to get it or if I have an issue with the schema that I need to consider.

imagen

For the base, I had modified a 3d base for GBSControl model, I'll share in other to understand the distribution for the db15 input ouputs. Also, If it works for your projects.

imagen gbscontrol8200-basev2.zip