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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Wed May 20, 2020 5:24 pm 


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Joined: 06 Oct 2015
Posts: 2253
Location: Montréal, Canada
_rm_ wrote:
Guspaz wrote:
What are you trying to do with it exactly? 480i60 -> 240p120? That's the only thing I could think of that would be useful for that setup, since you can't display 240p60 on a PC CRT and the 360 already natively supports 480p60 and up over VGA.


Yup, downscale to 15khz.


So, 15 kHz, 240p60, then. That's not supported by any PC CRT (not unless you're talking about 1980s era ones). I don't know enough about arcade monitors to comment, other than that they don't all necessarily run at 15 kHz either.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Wed May 20, 2020 6:55 pm 


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Joined: 07 May 2018
Posts: 546
Location: Escondido, CA, USA
I got the same results as gunstar with x360 vga and dreamcast vga. Not really workable.

Sent from my SM-G955U using Tapatalk


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Wed May 20, 2020 8:58 pm 



Joined: 12 Jun 2017
Posts: 191
from my short testing, combining H+V works great. Note that I did it with a full XOR circuit so I don't know if cruder methods work as well.

And if you're feeding the output to a 15k display you'll probably need to combine here too (this is where JVC monitors and their RGBHV input card came in handy).


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Thu May 21, 2020 8:11 am 


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Joined: 04 Sep 2013
Posts: 296
Location: Portugal
Guspaz wrote:
_rm_ wrote:
Guspaz wrote:
I don't know enough about arcade monitors to comment, other than that they don't all necessarily run at 15 kHz either.


The vast majority does, 15khz (240p) was the standard for Jamma games during decades.


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