Author Topic: SCART output with VGA Cable - green color?  (Read 4857 times)

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Offline eebuckeye

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SCART output with VGA Cable - green color?
« on: 03:15, 25 March 16 »
I bought a SCART to VGA cable and all I get is green shades with my VGA display.. Is there anything I need to do on the GX4000 console to use VGA with the SCART cable?


Thanks!

Offline khaz

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Re: SCART output with VGA Cable - green color?
« Reply #1 on: 03:45, 25 March 16 »
What cable did you buy?

Offline Tolkin

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Re: SCART output with VGA Cable - green color?
« Reply #2 on: 22:32, 25 March 16 »
If you bought only a cable for SCART to VGA it will normally be useless in your situation.
Some TV or or DVD Player can use or give a normal 31kHz VGA-Signal. (Like some METZ or Grundig TV-Sets, or Pioneer; Panasonic DVD Players). They can handle or create a VGA Signal, and normally this kind of cable is for these. Or your PC have to handle the GFX Card to bring "real" 15kHz Signals.

Your GX4000 output a 15kHz Signal which can not be used by a VGA-Monitor (Only old Multisync or some other VGA Monitors handle 15kHz Signals(CGA))
If your cable is a passive Cable (without a Converter) you wont get a Picture on a VGA-Monitor which not supporting 15kHz. (No Picture Buffer, no 15-31kHz conversion, Only VGA Connector wired direct to a Scart Plug)

You can use a converter like this for VGA :
CGA nach PC Wandler CM-397M, 99,00 €, Normwandler.de
or for HDMI this:
SCART nach HDMI Wandler CS-720PHD, 79,00 €, Normwandler.de
But as every converter you can get Problems in some Games (eg. Ghost&Goblins) or many Demos, because of the programming of the CRTC which a converter can not handle to get a smooth and stable Picture.

You can use More equipment for getting a better picture like this one i use for a few Arcade boards:
Scanline Generator - ArcadeForge

Or you ca use the "mysterious" RGB Framemeister which creates a very good picture but is much more expensive and the new ones have Japan "Scart" Connectors which makes it not easy building cables for it.

So hope it helped
Bye Tolkin
« Last Edit: 22:34, 25 March 16 by Tolkin »

Offline Munchausen

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Re: SCART output with VGA Cable - green color?
« Reply #3 on: 00:15, 26 March 16 »
If you bought only a cable for SCART to VGA it will normally be useless in your situation.
Some TV or or DVD Player can use or give a normal 31kHz VGA-Signal. (Like some METZ or Grundig TV-Sets, or Pioneer; Panasonic DVD Players). They can handle or create a VGA Signal, and normally this kind of cable is for these. Or your PC have to handle the GFX Card to bring "real" 15kHz Signals.

Your GX4000 output a 15kHz Signal which can not be used by a VGA-Monitor (Only old Multisync or some other VGA Monitors handle 15kHz Signals(CGA))
If your cable is a passive Cable (without a Converter) you wont get a Picture on a VGA-Monitor which not supporting 15kHz. (No Picture Buffer, no 15-31kHz conversion, Only VGA Connector wired direct to a Scart Plug)

You can use a converter like this for VGA :
CGA nach PC Wandler CM-397M, 99,00 €, Normwandler.de
or for HDMI this:
SCART nach HDMI Wandler CS-720PHD, 79,00 €, Normwandler.de
But as every converter you can get Problems in some Games (eg. Ghost&Goblins) or many Demos, because of the programming of the CRTC which a converter can not handle to get a smooth and stable Picture.

You can use More equipment for getting a better picture like this one i use for a few Arcade boards:
Scanline Generator - ArcadeForge

Or you ca use the "mysterious" RGB Framemeister which creates a very good picture but is much more expensive and the new ones have Japan "Scart" Connectors which makes it not easy building cables for it.

So hope it helped
Bye Tolkin

Or use a GBS-8220 board from ebay to convert to VGA (e.g. Video Converter CGA/EGA/YUV/RGB TO VGA Arcade Jamma Game Monitor to LCD GBS-8220). But your mileage may vary, and you will need to make the cables yourself. I actually bought a SCART->VGA cable to connect up my GBS and it was wired wrong so I had to rewire it, but it was still easier than building my own cable.

Offline eebuckeye

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Re: SCART output with VGA Cable - green color?
« Reply #4 on: 05:16, 30 March 16 »
I bought this cable:


Scart Cable to SVGA VGA 15 Pin HD Plug Lead 1 5M UK | eBay


This is not the correct cable?  Does the GX4000 output RGB on the SCART connector? 


I use a Sony video converter which handles PAL and a wide range of frequencies (including 15Hz).

Offline Bryce

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Re: SCART output with VGA Cable - green color?
« Reply #5 on: 10:37, 30 March 16 »
Yes, the GX4000 provides an 15kHz RGB signal on the SCART socket. If you are connecting the GX4000 to a device that can convert the signal 15kHz to 31kHz then it would be fine, but can the Sony really take a 15kHz signal on it's SVGA port? Check the datasheet.

Bryce.

Offline eebuckeye

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Re: SCART output with VGA Cable - green color?
« Reply #6 on: 15:04, 30 March 16 »
The person I bought the cable from said it was mainly for projectors only so he does not think it is the correct cable.  What does this mean?  How can I make sure to buy the correct cable?


Thanks!

Offline Bryce

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Re: SCART output with VGA Cable - green color?
« Reply #7 on: 15:13, 30 March 16 »
By telling us exactly what the Sony device model number is.

Bryce.

Offline eebuckeye

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Re: SCART output with VGA Cable - green color?
« Reply #8 on: 16:03, 30 March 16 »
Sony DSC 1024G

Offline Bryce

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Re: SCART output with VGA Cable - green color?
« Reply #9 on: 16:44, 30 March 16 »
That's one fancy piece of kit. According to the datasheet it looks like it should be able to handle the signal, however, the cable you have may not be wired correctly. You'll either have to check and modify that cable you have or make a cable up yourself.

Here's how it should be wired:
SCART Pin       ->              VGA Pin(s)
5                                      8
7                                      3
9                                      7
11                                    2
13                                    6
15                                    1
17                                    10, 11
19                                    13


Bryce.

Offline PulkoMandy

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Re: SCART output with VGA Cable - green color?
« Reply #10 on: 16:58, 30 March 16 »
the GBS8200 in its default configuration is not a very good choice, because the output signal is fixed at 60Hz and it does way too much signal processing (trying to deinterlace a progressive signal, etc).
However, some people did reverse engineering on the hardware and it's possible to reprogram it with some extra hardware to do the right thing (that is, just line-doubling).


My implementation of this is available here: GitHub - pulkomandy/gembascan
It was used during the Forever party for Thomson, CPC, and Sam Coupé prods on the bigscreen. It does not work yet with ZX Spectrum because it uses a bit unusual video timings.

Offline Munchausen

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Re: SCART output with VGA Cable - green color?
« Reply #11 on: 22:41, 30 March 16 »
the GBS8200 in its default configuration is not a very good choice, because the output signal is fixed at 60Hz and it does way too much signal processing (trying to deinterlace a progressive signal, etc).
However, some people did reverse engineering on the hardware and it's possible to reprogram it with some extra hardware to do the right thing (that is, just line-doubling).


My implementation of this is available here: GitHub - pulkomandy/gembascan
It was used during the Forever party for Thomson, CPC, and Sam Coupé prods on the bigscreen. It does not work yet with ZX Spectrum because it uses a bit unusual video timings.

Nice job.

There are a few threads on here about this, the raspberry pi solution is quite nice (especially with the availability now of the pi zero).

If you do a search there are also a few different solutions to the problem where small amounts of noise (random white dots) appear on the screen.

Offline Bryce

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Re: SCART output with VGA Cable - green color?
« Reply #12 on: 22:45, 30 March 16 »
I have a WIP for this too, that removes the need for a RPi to be connected. As soon as I get time I'll finish and publish it. I only recently managed to get a GBS that had the problem, my original one doesn't have the issues.

Bryce.

Offline eebuckeye

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Re: SCART output with VGA Cable - green color?
« Reply #13 on: 16:19, 31 March 16 »
Found out my cable only had a few pins connected with video out going to green on VGA.  I can not rewire this cable because it only has a few wires..


How can I make sure to buy a SCART to VGA cable that has all wires attached?


Thanks!

Offline khaz

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Re: SCART output with VGA Cable - green color?
« Reply #14 on: 17:04, 31 March 16 »
Ask the seller?

At this point I'd just do it myself. Get a VGA cable, cut one end and solder the wires in a male Scart plug. You can even get audio out that way.

Offline Bryce

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Re: SCART output with VGA Cable - green color?
« Reply #15 on: 17:15, 31 March 16 »
Found out my cable only had a few pins connected with video out going to green on VGA.  I can not rewire this cable because it only has a few wires..

How can I make sure to buy a SCART to VGA cable that has all wires attached?

Thanks!

If that's the case, then the cable was made for Composite or S-Video, not RGB.

The only way to be 100% sure is to make it yourself.

Bryce.

Offline eebuckeye

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Re: SCART output with VGA Cable - green color?
« Reply #16 on: 17:22, 31 March 16 »
I have asked a few sellers and none knew the details.. ugh..

Offline eebuckeye

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Re: SCART output with VGA Cable - green color?
« Reply #17 on: 05:34, 12 April 16 »
I built a SCART to RGB cable using Bryce's instructions.   I check all the connections with a meter and everything is correct, however, I do not get a picture from the GX4000 using my Sony converter and I tried every setting possible.  Is there anything special needed to output the RGB signal or just plug in the cable to the GX4000?


I used this same cable I built to connect my QL to VGA using a SCART female-female connector and it worked great!  I bought the QL to SCART cable from Sellmyretro.gom .  This tells me the cable is wired correctly since it is passing the QL RGB signal through to the VGA port.


Do I need to use a particular power input to get SCART RGB output from the GX4000?


Any suggestions?  Thank you!
« Last Edit: 06:14, 12 April 16 by eebuckeye »

Offline Bryce

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Re: SCART output with VGA Cable - green color?
« Reply #18 on: 10:38, 12 April 16 »
Which cable exactly did you build? I don't remember ever releasing plans for a cable that would connect to the GX4000 SCART port.

Bryce.

Offline Munchausen

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Re: SCART output with VGA Cable - green color?
« Reply #19 on: 11:52, 12 April 16 »
Bryce's cable takes RGB -> SCART, not SCART->RGB!

A SCART->RGB cable should be much simpler, just Red->Red, Green->Green, Blue->Blue, Sync->Sync, GND->GND, Left audio->Left audio, Right audio->Right audio

Offline khaz

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Re: SCART output with VGA Cable - green color?
« Reply #20 on: 14:33, 12 April 16 »
Pretty sure you messed up between sync in / sync out

Offline eebuckeye

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Re: SCART output with VGA Cable - green color?
« Reply #21 on: 15:04, 12 April 16 »
ARGH?!?   :D


I wired using this:

SCART Pin       ->              VGA Pin(s)
5                                      8
7                                      3
9                                      7
11                                    2
13                                    6
15                                    1
17                                    10, 11
19                                    13

That was not correct?  It works when I use my QL -> Scart then this cable to VGA.  :-)


Thanks!

Offline Bryce

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Re: SCART output with VGA Cable - green color?
« Reply #22 on: 15:11, 12 April 16 »
Ah, that list. Now I know what you're talking about. Yes, this should work on the GX4000. Can you post a picture of what you're getting on the screen?

Bryce.

Offline eebuckeye

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Re: SCART output with VGA Cable - green color?
« Reply #23 on: 16:39, 12 April 16 »
I'm not getting any picture on the screen but seems the cable is wired correctly since it works with my QL SCART cable (with female/female adapter).

Offline Bryce

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Re: SCART output with VGA Cable - green color?
« Reply #24 on: 16:49, 12 April 16 »
Hmmm, maybe the Sony isn't happy with the Sync signal?

Bryce.