Modified CGA to VGA Scaler to accept clean sync RGB SCART

[Lexx]

hello

scart configure still can not but I have tried through the component
three consoles "PS2" "GC" "XBOX" in the picture there is snow, noise, why?
http://www.youtube.com/watch?v=-wT7WV1t ... e=youtu.be

add:
GBS 8200 CGA to VGA & Sync Strike & Scanline SLG3000, problem, Issue, SCART-RGB, NEO-GEO, GENESIS.
https://www.youtube.com/watch?v=OwrvQEHelYY

[alimadhi]

my megadrive 2 pal ver. i added LM1881 to GBS8220 with RGBS mod the screen flicking at 60hz and jumping at 50hz the , and about PSX & PS2 no signal and at RGBVH mod the screen not jumping or flicking but the signal wake and color like shit GBS8220 like shit too

http://imageshack.com/a/img713/5963/ie97.jpg

http://imageshack.com/a/img594/1721/x17o.jpg

http://imageshack.com/a/img560/8889/l1le.jpg

so this problem never solved and my advice don't buy this shit. I'm more than a month and I'm trying to solve the problem I did not find a solution, even in a lot of sites.

[fagin]

If it was a piece of shit, then why have so many (including myself) got it to work?

Take a good quality picture of your LM pcb and I'll take a look for you.

[MintyTheCat]

my megadrive 2 pal ver. i added LM1881 to GBS8220 with RGBS mod the screen flicking at 60hz and jumping at 50hz the , and about PSX & PS2 no signal and at RGBVH mod the screen not jumping or flicking but the signal wake and color like shit GBS8220 like shit too

http://imageshack.com/a/img713/5963/ie97.jpg

http://imageshack.com/a/img594/1721/x17o.jpg

http://imageshack.com/a/img560/8889/l1le.jpg

so this problem never solved and my advice don't buy this shit. I'm more than a month and I'm trying to solve the problem I did not find a solution, even in a lot of sites.

Hi there,

the Circuit does work and tbh it is not an overly difficult Circuit. Why not look back at the connections and we'll go through your circuit connection at a time?

I am doubting that you have much in the way of test-equipment but there are a few rules worth following wrt to limiting noise and ensuring that you have good connections.

Rest assured that the Circuit works but your implementation has some issues - let's try to be objective and constructive, shall we?

[alimadhi]

If it was a piece of shit, then why have so many (including myself) got it to work?

Take a good quality picture of your LM pcb and I'll take a look for you.

http://imageshack.com/a/img703/6831/prx8.jpg


high resolution

http://imageshack.com/a/img513/8/ksw7.jpg

[fagin]

I had problems with using the JAMMA connector (RGBs).... I would suggest you revert back to the RGBHV input as per my original post.

The LM circuit could do with a neat reconstruction imo, based on the components and methods I have suggested.

When you've eliminated the obvious, what's left is normally where the issue resides.

[mgy1523]

If I were able to take the Composite Video and extract say the Vertical Sync Out and the Horizontal Sync Out (along with Composite Sync), would that be a lot more suitable to use then say the what the LM1881 offers where it's the Vertical Sync Out and the Composite Sync Out?

Where I'm trying to go with this is that I found an IC called EL4583 (EL4583CN) which supplies this...



There's also the EL4581 http://www.datasheetdir.com/EL4581+Video-Filters which seems to have been designed to replace the LM1881 and is more stable as well.

That being said. Would the EL4583 (EL4583CN) and it being able to take composite video and extract the V Sync and H Sync and then wiring them to the GBS8200 RGBHV header accordingly so, work? Would that be more ideal along with being better as well?

Also, check this little board I saw that someone made up with the EL4583 in mind...

[mgy1523]

Shit... I didn't realize I bumped an old thread... I forgot the year is 2015 not 2014...

[ben.shinobi]

I've just tested my cga to vga scaler with many jamma pcb and many of my games have very good displays on my lcd.
I still have problems with few pcb who don't have 60hz refresh rate (like Raiden fighters: 54hz and Flying shark: 55hz).
Do I need Sync cleaner to resolve the display problem with this specific frequency ??

[dooklink]

Shit... I didn't realize I bumped an old thread... I forgot the year is 2015 not 2014...

I'm interested in using this chip in my sync processor circuit. maybe post in one of my threads, or make your own.

480i to 240p circuit thread:
http://shmups.system11.org/viewtopic.php?f=6&t=52347
GBS8200 Custom Firmware Project thread:
http://shmups.system11.org/viewtopic.php?t=52172

[larsoncc]

Hi there. This is an older subject, but I just took on this project, exactly as outlined in the lead post. I am hoping there are still some folks in this forum that are willing to discuss.

I figured it was an affordable way to check things out - if I throw my money away, at least it's not a ton of money. I think the circuit is working, but perhaps I've done nothing, lol. I can certainly follow a schematic, and while my soldering skills kinda suck, they get me by. I used a non-tinned prototyping board to set this up, so you won't see cut traces. (I've got some pictures but you can't really see the circuit, I'll get on that and post again)

I am able to get a fantastic picture from my Saturn. Nothing else I've tried works.

I'm in a bit of an odd situation. SCART headers weren't exactly easy to find, so while I ordered one, it's yet to arrive from the UK (it's been weeks). In the mean time, I'm trying to use bare wire leads to test functionality.

1. Saturn - works fantastically.
2. Genesis, Model 1, DRM chip / high def graphics version - no signal.
3. Genesis + 32X - "signal" with proper colors. But cut up into what looks like quarters or something, flashing on screen, jumping around - total mess. Assume a sync issue?
4. SMS - no signal.

No other systems yet tried. Anyone have a suggestion of something that I could try with these silly wires?

My next test will be to try to run the Saturn in without the sync cleaner, as a ghetto test to see if the sync cleaner is doing anything.

Which systems should I be bypassing the sync cleaner on, if any? There was a post earlier in the thread stating that a csync+this chip=problems.

I need to come up with some way of clipping the wires onto SNES, Jaguar, etc to test those systems out. The wait on this SCART header is killing me... and I have to say, I don't know about blindly throwing money at SCART cables until I'm at least reasonably sure I've not cocked the whole thing up (cause here in the states, they're $20-40 each).

As a bit of a "haha", here's what I've spent so far, I literally have overpaid for EVERYTHING and the project is still affordable:
$32 on the scaler
$8 for wires (jeez)
$8 for the stripper chip
$5 for the caps (30 of em)
$4 for the resistor (100 of em)
$6 for the prototyping board (jeez!)
$6 for a DIN header that didn't even fit to the Genesis as the top two pins were aligned slightly differently (*facepalm*)
$7 for crimp pins that I figured would make it easier to test these wires with that didn't actually fit into anything (*facepalm*)
$9 for the power supply
$10.50 for the SCART header I haven't received yet

So ~$100 which, you know, I could have cut in half, but it's not like the kids are going unfed or anything. Some people go to casinos, I gamble on electronic stuff.

Listen, I know this is terrible looking, but here's where I'm at so far: http://imgur.com/a/yxLAw I'll get better pictures together of the chip set up, but importantly please understand that these pictures represent absolutely ZERO cable management at all.

[larsoncc]

Since posting the other day, I've gotten much farther in the project. I'm happy to say that I have a nice signal now from SMS and Genesis, and I'm working to button things up nice and pretty.

I'll post more when I have some pictures!

I have the SCART header now. Pins are a bit bent, but eh, it'll work.

[larsoncc]

Here's a build log and pictures of the final product. MAN was this project fun! Thanks guys!

http://imgur.com/a/WtL1i

[kdesktop]

I made this modification on my GBS-8220 using the same components...

My PS1 works fantastic, but for my PS2 all screen is PINK (No green tint).
PS2 needs internal modification to works with Scart/Rgb?

Using video component cables i don´t have any problems, all the colors is OK, the same Scart/RGB cable works fine on PS1.

Tnx for any help.

[Fudoh]

PS2 needs internal modification to works with Scart/Rgb?

no, but you have to switch it to RGB in the menu. Sounds like yours is still set to component.

[kdesktop]

PS2 needs internal modification to works with Scart/Rgb?

no, but you have to switch it to RGB in the menu. Sounds like yours is still set to component.

Hi Fudoh, PS2 output is RGB...



FIXED

The problem is... i don´t know how but the green pin of my scart cable is not touching the green pin of AV PORT on my PS2... it works only on PS1. i raised scart cable green pin and now WORKS ok, both PS2 and PS1. Thanks for the help.

This scaler has poor quality.

[Odissine]

Hello all, Is there anyway to have the shema for plugin my 5pin RGBs to my scart cable ? (see 1st post)
I don't know how to do this I know to link R, G and B cables but the two other (white and black) where to I link them on my scart cable ?
Thanks for your help ^^

In fact I bought a RPI 2 to plug on my CRT... I use HDMI to VGA cable first, and next a VGA to CGA converter (for 15Hz) and final step I'm trying to convert CGA to SCART ... but I found nothing on web and want to create it myself

Thanks again )

Edit : I tried something like this below , but result is almost great ... I miss scanline on my screen :/ Maybe I forgot something or resolution is not the good one ? (480p with RPI, maybe I've to try 240P ?)
Thanks again :p

[Raen]

Hi all,

I recently acquired a Sony Trinitron Multiscan CPD-G500 21'' CRT Monitor, which has VGA + RGBS BNC inputs. I use it with an old desktop PC and with my Dreamcast + Toro VGA box combo. I eventually bought a SCART to BNC cable from retrogamingcables.co.uk to avoid having to swap VGA cables every time I wanted to switch between PC and DC, leaving the VGA input for the PC and the RGBS BNC inputs for the Dreamcast (not a big deal, since the Toro VGA Box can also output 480p through SCART).

Everything was going great, until I tried to play a game that apparently is not VGA compatible, and cannot be trickied into playing in the 31 khz VGA mode. That, allied to the fact that the monitor doesn't support 15,6 kHz RGB mode (says "out of scan range"), poses my problem.


I searched a little bit and the solution is to get a scandoubler (aka line doubler, upscan converter, etc) to convert the 15,6 kHz signal into a 31 kHz one that the monitor supports, and by doing so, even the games that can't be trickied into VGA mode should be playable in this monitor in RGB mode, which was initially my plan.

Initial search attempts led me to a scandoubler called CV3D Scandoubler, but that is for the Amiga and nothing that works with the Dreamcast came up. Then I saw the OSSC review on Fudoh's website and thought that I'd found the solution, until I saw that it has only digital outputs, not analog ones.

Someone said to me that I could buy a cheap GBS-8220 CGA to VGA board, that it would do the trick. I just wanted to hear a second opinion, since these boards don't seem to be of the highest quality and don't have SCART IN and SCART OUT (maybe a mod lies ahead, just like fagin's?).
Is this GBS-8220 CGA to VGA board really the best option for the job (scan doubling 15 khz to 31 khz), or is there a better alternative?

[Fudoh]

Is this GBS-8220 CGA to VGA board really the best option for the job (scan doubling 15 khz to 31 khz), or is there a better alternative?

you have dozens of different machines you can choose from. I've reviewed most of them on my website. The 8220 is dirt cheap and you get what you pay for. There's an alternative firmware for the GBS which makes the picture quality considerably better, but it's not exactly easy to get it on there.

[Raen]

Thanks Fudoh. Right, when buying cheap you get what you pay for, but for the time being, I don't need anything at the level of a XRGB, just something simple that gets the job done (right). Could you please elaborate on that alternative firmware for the GBS? Do you have any info about it on your website?

[Fudoh]

http://shmups.system11.org/viewtopic.ph ... hilit=8220

[Raen]

Thanks, guess I now have another reason to buy a RPi.