Gonbes GBS-8200 Manual

This is a support manual for the GBS-8220 – which comes in a one vga port and two port version.
When using this oard you want to read all the information in this document – there are many
common mistakes/issues when using this for arcade conversion that can easily e cleared up.
Most common is using a 1Amp power supply or wrong power. This oard works est with 5V and at
least 2Amps. Less than 2 Amps will give pro lems!
Another common issue is Red Color increasing and video issues. Adjusting the "clamp ST" and "clamp
SP" settings of the oard will usually correct this.
Other issues are incorrect signal connections.
Who makes these cards?
These are made by Gonbes.
The model numbers are GBS-8200 / GBS-8220. They mostly look the same ex ept the 8220 has 2 VGA
D-SUB 15 onne tors in output.
http://en.gonbes. om/produ t_detail.asp?menuid=94&id=22
What is it?
It's a p b ard for video ups aling, that an onvert a 15Khz RGBS input (e.g. from a JAMMA board) or a
omposite (YPbPr) signal into a more onventional 31 Khz VGA output, ompatible with most modern
monitors and LCD/LED TVs (whi h no longer re ognize 15Khz).
Commonly used to onvert old onsoles/ omputers to a VGA signal, upgranding old abs into newer
monitors, and superguns of ourse.
How well does it work?
Your mileage may vary. Many people seem to be happy with it but many others have a number if issues.
Outputs 60Hz so may be worse if your input is 50Hz. (I've only tried 60 Hz)
What are the issues?
The ups aling applies a bit of smoothing, whi h you an redu e using a "sharpness" setting.
When in operation you may see some noise with some pixels fli kering. This is barely noti eable (it's
pixels of the output resolution so they're small) and some TVs may orre t it (haven't tried).
You may have syn issues if your grounding or power sour e is not good enough.
Does it slow down the video?
Probably but not as far as I an tell. The movement feels like 60Hz.
I an noti e some interla ing in some shadows (ie. for strong bla k fli kering on white) but it's massively
better than the FPS being put out by a Multi PCB for example (30 fps).
(update: using a s anline filter improves the interla ing by hiding some of it. still noti eable but plenty
playable)

What's your take on it?
My own experien e is ok. There's minor noise in pla es (fli kering dots or some olors bleeding into
another - not big issue but you an tell it's not a PC).
The noise is are more or less noti eable at different resolutions.
I initially had syn issues - it would work fine for about an hour then the image would start to jump. That
was due to a power supply that was not strong enough when it heated up.
What's the difference etween the GBS-8200 and the GBS-8220?
As far as I an tell the only differen e between the two seem to be an extra VGA output, probably a
lone of the display.
I only tried the 8200, so if anybody has more info, please share.
Do I need a sync cleaner?
Not for Superguns / JAMMA inputs. It would be needed if you onne t a onsole or omputer from it
though.
How to tell if it's genuine?
Don't know. Apparently there are bootlegs of the ard floating around that don't work as well.
Mine looks identi al to the one on Gonbes website, with the hinese title with a "III" on it.
Is it etter than a XRGB?
Don't have an XRGB but I'm tempted to say the GBS is worse be ause:
has noise of some pixels fli kering, is very sensitive to input voltage, and the two voltage inputs seems to
work differently (had issues with the "DC in" one, less with the other "molex" input).
Other than that an XRGB ups aler osts 10 times more than the GBS, so I would hope it works better
If I get a scanline filter do I need a different power supply?
No - I saw on a video somebody using DC in on the GBS for the power supply, then haining the s anline
filter through the molex onne tor.
The GBS a tually has two power onne tors, and it turns out that you an use one to onne t another
devi e.
The SLG-3000 is 5V as well, so the setup works very well.
What PSU do I need?
5V 2A at least. Any less (lower voltage or not enough amperage) will give you a red or blue s reen with
blo ks (even without an input signal).
Apparently the GBS8200 an a ept 12V, but reportedly this seems to heat it whi h leads to different
issues after running for some time.
Gonbes website states 5V +/- 0.5, so sti k to 5V.
Personally, I use the same power supply as my JAMMA harness. Otherwise, I get syn issues (whi h
ould be due to grounding perhaps, I have not tried another setup).
If you have a "boun ing" image (bad syn ), it ould be due to the power supply not being strong enough.

CGAto VGAVideo Converter GBS-8220
PCB Basic Setup
Article Number: 13 | Rating: 3.9/5 from 7 votes | Last Updated: Thu, Feb 11, 2010 at 7:09 PM
Included with the CGA/EGA/YUV to VGA HD-Converter PCB (GBS-8220) will be:
•The main GBS-8220 PCB
•2-Pin +5VDC Power Cable
•8-Pin (6 wire) RGB Cable
•GBS-8220 Manual (4 pages)
STEP 1: Connect the VGA output monitor to P3 (VGA OUT) of the GBS-8220 Converter PCB.
If connecting a second VGA monitor, connect the second monitor to P4 of the GBS-8220
converter PCB.
STEP 2: Connect the incoming CGA, EGA, VGA, or component video source to the GBS-8220
converter PCB.
Most new JAMMA harnesses include the special 5-pin white RGB connector. Below is a picture
of this common RGB video connector found on newer JAMMA harnesses. If you have this type
RGB connector then simply plug this connector directly into P3 of the GBS-8220 converter
PCB.
<-- 5-Pin RGB Video Connector Sample
If you do not have the simple RGB connector shown above, the GBS-8220 converter PCB
includes a RGB cable which can be used to adapter your CGA or EGA video source to the GBS-
8220 input. Since the output of the game or device you want to converter can vary you will need
to figure out what the RGB output pinout is. Once the video wires from the game/device you
intend to converter are known, connect/splice to the included 8-pin (6 wires) RGB cable.
•Red Video to Red Wire/P11 (R)
•Green Video to Green Wire/P11 (G)
•Blue Video to Blue Wire/P11 (B)
•H. Sync to Gray Wire/P11 (S)
•V. Sync to Yellow Wire/P11 (VS)
•Ground Ref to Black Wire/P11 (GND)

Connect the 8-pin (6 wires) RGB cable to P11 on the GBS-8220 converter PCB.
STEP 3: Connect the GBS-8220 PCB to your +5VDC Power Source by connecting the RED
wire of the power cable to the +5VDC source and the BLACK wire to the DC
GROUND source.
Then connect the 2-pin connector of the power cable to the P9 on the GBS-8220 converter PCB.
The power requirement for the GBS-8220 is +5VDC +/- .5VDC @ 2A. If the power supply
cannot put out 2AMP then it may cause problems with the on-bo
ard converter CPU. Usually this
converter PCB would be connected directly to an arcade game power supply which puts out
+5VDC up to 15A current.
When powering up the GBS-8220 converter PCB, after about 5 seconds try pressing the 'AUTO'
button on the converter PCB. This should self-adjust and lock-
in the picture on your VGA output
monitor.
If no good then remove the P11 wire harness from the converter P11 connector. Then move the
GRAY WIRE over one position on the connector (so it is next to the YELLOW Wire). Then
connect back into the converter and power up then try the AUTO button again.

Item Review: Arcade RGBS CGA/EGA/YUV TO 2 VGA CONVERTER GBS-8220(NEW)
Play your arcade boards on a standard computer vga monitor
Item Link: http://www.ar ademvs. om/rgbstovga.htm
Main Site Link: http://www.ar ademvs. om/
Their Ebay Store Link:http://stores.ebay. om/Y-PLUS
Des ription:
The high definition converter GBS-8220 it’s professional of game convert Support all
games(Amusement 、 Playstation 、 Xbox 、 wii……)convert to CRT monitor 、 LCD monitor 、 PDP
monitor…… Auto scan CGA/EGA/YUV signal, Two VGA outputs , output high resolution signal
*Supports CGA/EGA/YUV signal input
*Supports VGA output 640*480,800*600,1024*768,1360*768
*CGA/EGA signal auto s an(15K,24K,31K)
*YUV signal auto s an(480i,576i,720i,1080i,480p,576p,720p,1080p)
*Chinese and English OSD
*Supports position ontrol & zoom ontrol
*True digital 24-bit A/D onverter for true 16.7-million olor onversion
*Supports all VGA monitor (CRT、LCD、PDP、PROJECT……)
(Item Des ription taken dire tly from their ebay ad. Broken english and all)
My S ore: 4 out of 5
Value: 5
Item was a tually pur hased from their ebay store for $39.00 and $12.00 shipping for a total of $51.00
USD. For the features it promissed this is a pretty good deal.
Pa kaging: 3
I know that it's not the reason you pur hase one of these but it does say a little about how a ompany
works. As you an see in the images below the pa kaging isn't very durable. They did at least make an
attempt to mark it Fragile. It also took about 3 weeks to rea h me after pur hase in the entral USA
area.