GUN2CRT, the new universal CRT lightgun adapter

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JayBee:
Thinking about it, there is one solution for people who want to use scalers like the GBS-C, they just have to connect the scaler first and my adapter to the scaler VGA out.
It should totally work since it will use the same res/timings as the screen.

Zebidee:

--- Quote from: JayBee on March 10, 2021, 11:06:22 pm ---Thinking about it, there is one solution for people who want to use scalers like the GBS-C, they just have to connect the scaler first and my adapter to the scaler VGA out.
It should totally work since it will use the same res/timings as the screen.

--- End quote ---

So long as it doesn't rely on say 5v via pin 9 or continuity of specific ground pins or similar. Sometimes the issue with having extra 3rd party devices on the same line is that you can never be 100% sure what they do with the pins you assume to be standard.

No issue with USB return timings?

JayBee:

--- Quote from: Zebidee on March 11, 2021, 12:09:05 am ---
--- Quote from: JayBee on March 10, 2021, 11:06:22 pm ---Thinking about it, there is one solution for people who want to use scalers like the GBS-C, they just have to connect the scaler first and my adapter to the scaler VGA out.
It should totally work since it will use the same res/timings as the screen.

--- End quote ---

So long as it doesn't rely on say 5v via pin 9 or continuity of specific ground pins or similar. Sometimes the issue with having extra 3rd party devices on the same line is that you can never be 100% sure what they do with the pins you assume to be standard.

No issue with USB return timings?

--- End quote ---
Of course I'm not relying on the vga port 5v, the MiSTer or other similar devices don't have it anyway :lol
What do you mean usb return timing? You mean the polling rate?

Zebidee:

--- Quote from: JayBee on March 11, 2021, 01:00:03 am ---What do you mean usb return timing? You mean the polling rate?

--- End quote ---

I guess so. I have only a rough idea about how lightguns work, don't have any but always interested. I've already added lightguns to end end of my list of things to do, but it is pretty long already so will see how she goes.

Howard_Casto:

--- Quote from: JayBee on March 09, 2021, 05:35:57 am ---
--- Quote from: CanadianRyGuy on March 08, 2021, 11:24:02 pm ---This project looks awesome and already has me looking around my city for a nice crt tv lol. Just curious what this device might cost once all said and done?

--- End quote ---
This hasn't been decided yet, as it's still in early prototyping phase :D

--- Quote from: Howard_Casto on March 09, 2021, 01:17:30 am ---Ok how about this scenario. I use gbs control to pump native rgbs into a crt with component in. I believe the max output is 480p. There's no upscaling or anything like that involved, the only thing it does is convert to component so if it's a 240p signal that's what the tv is going to get. Would that work or is the conversion enough to throw off the timing?

--- End quote ---
The latency added by the GBS-C, while being minimal, would most definitely throw the timing off and make the gun unusable.
To explain shortly, the gun needs a timing precision or at least 0.1 microsecond to work well, which pretty much no scaler do.
But there is also another issue, if you double the resolution of the video signal while the gun is still sync with 15kHz, it just won't understand what's happening :lol

If you want a higher res signal, the best is to simply have everything working at that res.
For instance in the last demo videos, I'm using the system on a pc crt at 1025x768@75Hz.

--- End quote ---

I don't think you are hearing me on this one. I'm not using it as an upscaler.... it's outputting native res which the tv accepts happily as it's a 1999 crt SD tv, one of the first to have component input. the only thing it's doing is modifying the color space and I think the chip does that at the hardware level, I'm not sure. Timing is the only issue here, not resolution.

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