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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Fri Jan 13, 2023 11:26 pm 



Joined: 10 Sep 2021
Posts: 2
I built mine around Aug 2021, has their been any major updates or fixes on the firmware in sense that i should get around to updating the firmware??


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Sat Jan 14, 2023 2:57 am 


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Joined: 07 May 2018
Posts: 927
Location: Escondido, CA, USA
Puppydogpals wrote:
I built mine around Aug 2021, has their been any major updates or fixes on the firmware in sense that i should get around to updating the firmware??
Check rama's github and the date on the firmware. I dont think theres been any updates in a couple years. Rama deemed it as complete as he was interested in getting it as of his last update.

But the final update, I believe changed the 720p profile to a 16:9 image and 1080p to a 4:3 image on a 16:9 canvas, and some other quality life improvements.

Sent from my SM-G955U using Tapatalk


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Sat Jan 14, 2023 4:37 am 



Joined: 04 Apr 2014
Posts: 985
A quick question for those experienced with the GBSC. Is it possible for the device to send out 31khz by glitch or reset on the device? Obviously I'm hoping to lock it at 15khz, but I'm just hoping the thing is solid and secure in this area (like how crt emudriver is on groovymame builds). Would really hate to have my CRT receive occasional (or intermittent) 31khz signals during use.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Mon Jan 16, 2023 11:48 pm 


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Joined: 31 Oct 2016
Posts: 2166
Location: bmore
Can anyone tell me what the current state of downscaling a 480p RGBHV signal from a PC to a 240p 15kHz RGBS or RGBHV signal is here?

As in, I want to connect my PC and downscale SVGA resolution games from 640x480 to 240p and display on my Ikegami in 240p.

I remember somewhere back in the thread that RGBHV input is no-good. Is that still an obstacle to this setup? If so, can I just use a sync combiner circuit and hook it up RGBS from there?


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Tue Jan 17, 2023 3:49 am 


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Joined: 07 May 2018
Posts: 927
Location: Escondido, CA, USA
You don't have to go back too many pages to see this discussed recently.

Rgbhv downscaling doesnt work. Rgbs or ypbpr downscaling works great. Output is native rgbhv or ypbpr with a mod.

Sent from my SM-G955U using Tapatalk


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Thu Jan 19, 2023 11:51 am 


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Joined: 21 Jul 2005
Posts: 255
I know the brand RetroScaler isn't something id recommend using (older unit) but what about this new? GBS-C Variant?

Anyone has tested it and does it hold up to the ususal GBS-C Setups?

Image
Image

the slick PCB looks nice it has also a glock gen inside, think it's alswo firmware upgradable from the usual GBS-Cs right?!

I've read that for example the ODV Variants should be avoided because of image ringing effects but what about the quality of this one? its very inexpensive aswell


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Sat Jan 21, 2023 8:54 am 



Joined: 24 Feb 2022
Posts: 62
RuffNEC wrote:
Anyone has tested it and does it hold up to the ususal GBS-C Setups?

Thanks for posting, I was not aware of this new model. I picked one up just now as cash rewards have a 20% off deal going tonight on Aliexpress plus I was curious to test it out.

It has many features my current GBS-C setup doesn't have so hopefully it works well.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Sat Jan 21, 2023 2:42 pm 


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Joined: 07 May 2018
Posts: 927
Location: Escondido, CA, USA
Interested to see performance on this one as well. My old trusty unit that has been kicking around since the early days of gbsc development continues to work well, but aesthetically...not so much. I would love to get something more visually appealing if the price is right and performance is there.

Sent from my SM-G955U using Tapatalk


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Sun Jan 22, 2023 5:57 pm 


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Joined: 21 Jul 2005
Posts: 255
Dreamcazman wrote:
RuffNEC wrote:
Anyone has tested it and does it hold up to the ususal GBS-C Setups?

Thanks for posting, I was not aware of this new model. I picked one up just now as cash rewards have a 20% off deal going tonight on Aliexpress plus I was curious to test it out.

It has many features my current GBS-C setup doesn't have so hopefully it works well.


well it doesn't support composite and s-video but that isn't something I'm going to use anyays. Bought one too now. but it's not here until march I guess :(


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Tue Jan 24, 2023 7:37 pm 



Joined: 04 Apr 2014
Posts: 985
Yeah so this didn't work for me at all. It's wonderful on paper but in practice on my consumer CRT this wasn't working.

The web UI is very inconsistent seems to disconnect a lot (even when my wifi is solid) which makes it hard to reliably know that you are setting things the way you want (in my case downscale to 240p 15khz). I ended up relying on the screen to select downscale, but this didn't fix the issues I was having.

On the Dreamcast using Scart cables from Retro Access (both in 15khz and 31khz modes) I power up and downscale I get a lot of noise and video anomalies, and worst of all a huge horizontal black line across the screen making everything unplayable. Maybe it would work differently if I had a Dreamcast VGA box but I don't have one to test.

The worst part of it all is the tv still seems to send out ocassional 31khz signals (such as when powering a console up). This happens even when the console is sending out 15khz. Last of all when I power the console down the gbs-c reverts to sending 31khz on a black screen. Not cool for the CRT!

For those interested my set up was as follows:

Dreamcast > Scart (with sync combiner built in) out > GBS-C > VGA out > VGA2SCART > Scart out > Gscartsw > scart out > Audio Authority Comp switcher > Component > TV


I disconnected it and decided to give up. I think it's wonderful that these projects get made, and I guess the main market for this one might be upscaling with downscaling still a work in progress.

Maybe in 2023 or in the coming years we'll see downscaling continue to evolve and eventually reach a place where we can use it reliably on PS2 and DC, but I think it's not quite there yet.


Last edited by Taiyaki on Tue Jan 24, 2023 7:41 pm, edited 1 time in total.

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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Tue Jan 24, 2023 7:41 pm 


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Joined: 07 May 2018
Posts: 927
Location: Escondido, CA, USA
You may have some faultiness in your unit. I use mine for downscaling regularly and have no problems.

As noted, rgbhv downscaling does not work, but rgbs and component downscaling works great.

Sent from my SM-G955U using Tapatalk


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Tue Jan 24, 2023 7:42 pm 



Joined: 04 Apr 2014
Posts: 985
NoAffinity wrote:
You may have some faultiness in your unit. I use mine for downscaling regularly and have no problems.

Sent from my SM-G955U using Tapatalk

Is that so? RGBHV downscale doesn't work? I believe my DC using that retro access cable was sending out RGBs though.

Could you link me to which model or make your GBS-C is? What console and what video out are you using it with for downscaling?


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Tue Jan 24, 2023 10:30 pm 


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Joined: 07 May 2018
Posts: 927
Location: Escondido, CA, USA
I'll provide the model date printed on the PCB when I get a chance. I've had this unit for quite a few years, so even if I could find the purchase link, no guarantees youd get the same model.

I've sent x360 ypbpr 480p, ps2 ypbpr 480i/p, xbox original ypbpr 480i/p, wii ypbpr 480i/p, Saturn rgbs 480i, n64 rgbs 480i, ps1 rgbs 480i through it with no problem.

The clock gen seems to be the most common failure or faulty part out of the box. If you have a clock gen on yours, it might be worth removing it and retesting.

Sent from my SM-G955U using Tapatalk


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Wed Jan 25, 2023 3:16 am 



Joined: 27 Nov 2014
Posts: 144
Location: Hellhole
I bought this model because of the composite and s-video input, but it turned out to be complete shit.

Image
https://www.aliexpress.com/item/1005005061485676.html

Some photos:
https://1drv.ms/u/s!AlSgH9mVunlegpwNNK1 ... A?e=HCBBBB
Jailbars everywhere. S-video is bad but not bad as composite.

At least the other inputs work normally


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Wed Jan 25, 2023 6:36 pm 


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Joined: 21 Jul 2005
Posts: 255
Ripthorn wrote:
I bought this model because of the composite and s-video input, but it turned out to be complete shit.


well you're not the first saying this. Could you test it with RGBs ? How is the image quality no ringing noise?


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Wed Jan 25, 2023 11:41 pm 



Joined: 27 Nov 2014
Posts: 144
Location: Hellhole
RuffNEC wrote:
Ripthorn wrote:
I bought this model because of the composite and s-video input, but it turned out to be complete shit.


well you're not the first saying this. Could you test it with RGBs ? How is the image quality no ringing noise?

Through the scart input the image is very clean, I didn't notice any artifacts.
I don't know exactly what ring artifacts would look like, but I'm pretty sure I didn't see anything resembling a ring appearing on the screen.

I will post more pictures later.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Thu Jan 26, 2023 2:21 am 


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Joined: 07 May 2018
Posts: 927
Location: Escondido, CA, USA
@Taiyaki Image

Sent from my SM-G955U using Tapatalk


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Thu Jan 26, 2023 5:46 am 



Joined: 04 Apr 2014
Posts: 985
Thank you NoAffinity for sharing!


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