Question about ScanDoubler and Mediator Video Card

[keropi]

color matching and blur/bleeding colors are 2 different things. No matter what sd/ff you have, it will still kick the a$$ of a vhs input.
SVHS and S-Video INPUTS mean the same thing here (Greece) if it means something else there , I don't know...
Also does the rgb output of the a1200 provide the luminance and chrominance signals to create the S-Video signal?
and the jerkyness is a thing I forgot, it is valid and annoying.
On a pc one can use a prog like FLY2000TV to make the tv-card output 2x fps, (50 for PAL, 60 for NTSC) thus giving fluid motion (fly2000tv worked only on SAA71xx chips, but now later versions added BT878 support)

[Legerdemain]

color matching and blur/bleeding colors are 2 different things. No matter what sd/ff you have, it will still kick the a$$ of a vhs input. SVHS and S-Video INPUTS mean the same thing here (Greece) if it means something else there , I don't know...

VHS and S-VHS is two different video systems; in other words, two different formats to record and play analogue video. S-Video is short for Separate Video and is a video signal. Its quite a difference, really, and that is valid for every country. But, yes, S-VHS and S-Video is VERY OFTEN confused to be the same thing. So, in short: S-Video, Composite Video, RGB and such... are all analogue video signals... which VHS and S-VHS isn't. So, in all honesty, I don't have a clue as of what you mean with VHS input, sorry.

And, no, a ScanDoubler doesn't necessarily have to produce high quality video output... but, yes, in most cases there will be insanely much better quality of the picture when using a ScanDoubler/Monitor solution than when using a, for example, composite video together with a TV (obviously).

Also does the rgb output of the a1200 provide the luminance and chrominance signals to create the S-Video signal?

No, it doesn't... but you could still use a RGB -> S-Video converter and get much better quality of the picture than when using composite video (or worse, a RF-connector) as long as the TV-cards drivers support input from the S-Video connector.

[keropi]

if the rgb port cannot provide luminance and chrominance, then u cannot make an S-VIDEO cable, because this cable constists of these two signals...
and by VHS I mean the AV cable AKA composite AKA the one that has all the picture signals in 1 wire, hence the bleeding and bluring... u know the yellow plug looking like the sound RCA plugs... don't know how to explain better :-D

[Legerdemain]

@keropi

There are tons of RGB to S-Video converters out there. Fully functional. I am not thinking of a S-Video cable that you put directly on the RGB port, rather a regular RGB-scart which you then convert into S-Video and then plug it into the S-Video connector on the TV-Card.

Not really related to this thread, but if there is one thing I can't understand it must be the lack of RGB in the US (and all other places which doesn't have RGB as a standard). I couldn't live a day without RGB output on all of my gaming consoles (and my Amiga). It is a shame that it isn't a standard all over the world, because it is surperior to all of the other analogue video signals, S-Video included... *SOB*  ...I guess it won't matter that much ahead because other digital variants are kicking in, but up until this point I am rather thankful to have been living in Europe.

[keropi]

ah, u need some circuicity to make S-VIDEO out of rgb.... all consoles , nes/snes/psx/ps1/ps2/gc/dc/saturn etc, have on their scart cables extra vhs/s-video outputs because they natively produce such signals, you cannot just combine some rgb signals to s-video...
ever wondered why there is no s-video cable for the n64? because nintendo did not make it to output one, so you are only limited to rgb and vhs, leaving only vhs for vga-boxes thus producing crappy quality...  :lol:
and yes, scart rgb should be a standard, I hear on US there is a "component" standar, in some cases better than rgb, but never actually saw a device here taking such a signal...

[stopthegop]

If you have the room (big "if") then the BEST solution is to just use two monitors.  I have a Sony 19" flatscreen hooked up to my Voodoo card and an Amiga 1084s sitting unobtrusively on a custom built shelf right above it.  I leave the 1084s powered off except for the rare program that needs native screen modes or for troubleshooting.  The only "switching" I have to do is switching on/off the Amiga monitor.  Intuition does the rest.  

[Angus]

> ...just to get some things straight here...

A couple of points.

I've not had a problem myself with getting non-WHDLoad games fullscreen as luckily they have allowed me to insert a WAIT command before they start. I use this with games like UFO, The Settlers and JetPilot. I wasn't wild about the WHDLoad patch for UFO.

Alan Redhouse told me that the internal scandoublers provided better colour quality than external ones.

My TV card provides a better display on my Belinea monitor than I get on my Amiga monitors or TV, but in fairness they have seen better days. Joking apart though, it really isn't a bad display.


........and another thing (edit)

Getting an RGB to S-Video solution is not straightforward. I don't think you'll find anything you can buy to do the job, which leaves fixing it yourself. There is a document on the web that tells you how to convert an A520 modulator to give an S-Video output. I managed to get a professional electronics engineer to take this on as a favour. He followed the steps, and tweaked it around but could not get it to work as described.

In fairness it could have been a different revision of Modulator, but at the end of the day, this solution did not prove to be as easy or as straightforward as advertised.

[patrik]

@Angus:

Internal scandoublers doesn't sample the analogue RGB signal at the 23-pin video-port as the external ones do, but instead reads the signal digitally by hooking on to the outputs from Alice which goes to the DAC and thus get better image-quality as they do not suffer from any sampling artefacts.

Anyhow, all A1200 scandoublers/flickerfixers are crap as they all skip colours. All internal ones gives 4-bits for the green and blue channel and the red channel is the only one which gets the full 8-bit, so AGA games and such look pretty much like they are a OCS/ECS version. In this aspect, some external ones are better as they give 6-bits per colour channel.

The only scandoublers/flickerfixers which gives proper 24-bit (8-bits for each colour channel) are the DblScan 4000, the Compserv/Arxon Scandoubler 1/2 and the onboard PicassoIV flickerfixer.

Couple this or this with a regular Amiga RGB Scart cable and you are set.


/Patrik

[d0pefish]

I used to use a DCE Flickermagic ages ago with my A1200 and I think I can remember some of those nice copper gradients appearing colour banded.

I am now the (very, very lucky) owner of a CompServ Scandoubler II for my A4000 and AGA looks lovely now. :-)

It is a fantastic card - everything looks extremely crisp and sharp. The card itself is huge, it takes up the whole length of the video slot area and rests in the support railings. The S-Video and composite out are useful too.

I have still yet to figure out the best solution for switching between the SDII and my CVPPC; ideally looking for a nice monitor with dual inputs. :-?

[Legerdemain]

My TV card provides a better display on my Belinea monitor than I get on my Amiga monitors or TV, but in fairness they have seen better days. Joking apart though, it really isn't a bad display.

Every kind of TV/Monitor I have tried that runs RGB nicely have given a much better picture than anything related to TV-Cards running with either composite or RF input... and, even though there might exists TV-Cards that outputs the full 50- or 60Hz on the Amiga, I have yet to see one (and or hear from one having used one that seems to work nicely with the Mediator and its drivers). I just can't be satisified with less than S-Video (preferably RGB) and full 50- or 60Hz update. Frameskipping and an obviously rather blurry picture have never been enough for me. I am simply too picky when it comes to this very matter.

But, in the end, like I said earler... it is really nothing but a matter of what one expects and demands when running this very solution. Surerly there are tons of people that feel satisfied with what is offered.

Getting an RGB to S-Video solution is not straightforward. I don't think you'll find anything you can buy to do the job, which leaves fixing it yourself.

I was about to point you towards some sites offering a RGB -> S-Video converter, but I now see that Patrik already has done exactly that, so I won't bother.

:lol:

[Cefa]

You could always make your own rgb to svideo converter
http://www.nexusuk.org/projects/rgb2svid/

It seems pretty basic electronik but the hard part is getting hold of a CXA1645 IC i think they dont make them anymore.

But apparantly that circuit is standart on the PSX (if you have a spare or broken PSX), so you could salvage that chip and use it. Or you could leave the chip in the PSX motherboard and solder the Amiga RGB signal directly to the chip and break the RGB signal from the PSX to the chip. So the pin output from the PSX gives you the Amiga picture.