RGB/VGA to HDMI for Jamma board


I just saw this on ebay. Though unlikely, does anyone have any experience with this?

Limitations from what I can tell so far is
a)lack of audio on the HDMI port
b)720p max resolution on output…
c)unknown processing time to convert from RGB/VGA to HDMI.

Seeing how it ranges from $25-$50, it might be worth an investment.

Might be a good replacement for the RGB to VGA that I have in my supergun. Looks to be of a similar build size so it very well could be an easy swap.


A. VGA dont carry Audio, and as this was intended for Arcade cabinets, the sound system separate from the video
B. 720p is HD resolutions and was the norm for many years
C. Looking at the price, it is probably terrible

Also don’t do sub $50 HDMI video scalers


a) Which arcade cabinets and thus monitors have HDMI inputs? exactly. Maybe it isn’t just for arcade cabinets and monitors.
b) 720p is the bare minimum. Especially with 4k becoming more popular with the current gen consoles and computer gaming. At least 1080p would have been nice. 720p seems to be stuck in the past. Might as well had been 480p.
c) It very well could be but neither of us know.


Looks like a GBS-8200 variant. I would look into the Open Source Scan Converter if you want excellent RGB, through SCART, and VGA support to HDMI. It’s relatively pricey but definitely worth it.


A. The newer Vewlix and Namco cabs that are made now are all in some form of HD.
Cards like the one you linked to is for cheap Arcade owners/operators to install older arcade boards into newer cabs.
Cards like these are so Arcade owners can cheap out on repairs and use a standard Flat Screen PC monitor instead of getting the better made and more expensive flat screen options that are actually built with arcade cabinets in mind

Still Most Arcade cabs have the video systems completely separate from the sound.
Some Cabs don’t even have audio amps, as they expect the the Arcade boards to have their own audio amp.
Hence why so many SuperGun users use resistors to bring the attenuate the audio back down to line level so they don’t accidentally blow their speakers or sound systems.

Like what The Phantomnaut said, it looks to be a GBS-8200 variant or something along those lines. Yes the Device works, I never said it woudn’t work. but you be getting what you pay for, which isn’t much.

B. And Older Arcade boards only output at 240p. You get no benefit of forcing 240p content to upscale at 4k. Also if you go the cheap route it can look and feel like ass.
Only reason to force something to 4K is to match the native resolution of the Display, as HDTVs often have shit scalers that adds lag to the video.

C. Well we might not know for sure, but based on past experiences with every other $50 HDMI video scaler on the market I can make pretty educated guess how this is all going to go down.
If you want to take the plunge and spend $50 on a sub par solution, go for it. It’s your money. But if you want the best advice out there, I would take a pass.

Also the eBay seller you link to only has a 98.7% Positive feedback rating, that is actually terrible feedback for a seller.
154 Negative feedbacks in a month, 709 in the last 6 months and 1729 in the last year. That is a ton of unhappy customers.

If you have to buy this board, buy it from a seller with a better reputation, Minimum 99%, preferably 99.5% or better.


Another thing is, if this is a variant on the old GBS 8200, you need some form of sync cleaner. The 8200 only takes Composite sync (H and V sync combined) and not Luma as Sync or Component video as sync.
If you don’t already got some sort of clean sync you need a sync cleaner circuit or device something with a LM1881 chip (or similar component) inside.
A good example is the Sync Strike from Arcadeforge, which is another $35 to your costs.

Looks like this HDMI board takes Composite Sync and HV Sync. No clue it it requires TTL or 75 ohm levels on the sync line.
May not be an issue for most Arcade boards, but if you have any RGBs cables for any consoles you want C-Sync cables or a sync cleaner if your consoles lack a Csync output.

So I finally found a model number for the board SG-VC9900, shame I can’t find any reviews.


Is there a mid level converter to fill the gap of the 8200 and the OSSC?


I know there is that upcoming RetroTINK 2X device that acts as an HDMI-based line doubler. It’s very low lag and can accept composite, s-video and YPbPr but is meant for 240p and 480i sources. I wouldn’t be surprised if this device is like $100 or even less. Although I love my OSSC, the RetroTINK 2X looks tempting as a quick and dirty alternative.

If you are coming from RGB and want to use the device, there are always SCART to component transcoders.


Isn’t the retrotink only for the Raspberry Pie?


The 2X device is standalone.


Oh I see it now.

Only 480p output?
No RGB Inputs.

I, myself will stick to the OSSC thanks.


So I saw this


Looks promising for captures


I heard of Mike Chi new stand alone. With out rgb in I’m going to pass on that. Kapchr look interesting


I saw Dave’s video too and looked up the product number when he plugged it in. I am assuming that the campaign is simply a preorder system to get a set number of these from China. Also flexible funding so they are not gonna give up on this yet. Maybe the initial users will help bring some hype.

Even for the early bird price, it’s a bit much for me. I do wonder if someone who has an OSSC will get the KAPCHR and if it can easly recognize the higher resolutions and easy do resolution switching.

There is also that Datapath Vision E1 internal card that people seem to go crazy with. Even FirebrandX is using it to help with his upcoming profiles.



This does the same and it’s 9000 times cheaper (at least for 3rd world countries)


And its also a piece of junk


With the ezcap designation, I doubt it would work with the OSSC’s line output resolutions properly.


I bought one of these, and have just hooked it up to confirm that it works. Do people have any specific questions about them?


I don’t know, it looks like the same people who did the old Gonbes GBS8200 video converters.


I’ve been using my HAS supergun through scart with a mini framemeister, nothing but positive results on a 1080p native Bravia via HDMI. Granted some PCBs have flaking going on but you have to adjust some settings on the mini. It’s not the optimal setup as I heard the OSSC is a better product, so I’d either go that way or framemeister at the very least, anything less is going to look dull. Mind as well just play emulation, it looks a lot better if you can work the settings.