Converting TV signal from Amiga to HDMI?

[AmmoJammo]

indeed!

[mindprober]

I appreciate your effort. I am intrigued. However, the more I examine the comments from people using this adapter (mostly from game console users), the more it is apparent that the device is outputting a 240p resolution. Unless you can modify it to output 480i, I do not think I will have any hope of it working with my displays.

I'm looking into these modifications now, as I've found my new monitors (which are TVs) don't support the output from this adapter...

I'll try and find some information on what's needed...

edit: the issue is basically that standard definition uses a bi level sync, while high definition uses tri level... just googling it now

[AmmoJammo]

My results are much the same as magnetic's. I see a rock-solid monochromatic image, in the correct aspect-ratio as well! The TV reports it as 480i.  

Unfortunately, when I switch to PAL mode, the screen goes blank.  

I will test an interlaced screen when I get my WB 3.1 booted up again.

Is this the tv/monitor that worked with the composite signal fed into the "green" connector on the component input?

But now you're saying it doesn't work with the scart to component adapter?

I ask, because my tv that doesn't work with the scart to component adapter also does NOTHING with the composite signal fed into the "green"component input....

I'll see what my other tvs report the signal as being with the scart to component adapter... I've never looked!

[mindprober]

That's correct! Both of my displays will accept the A500's monochrome out into the green component input and, on top of the that, the results are perfect except for the lack of color.

Is this the tv/monitor that worked with the composite signal fed into the "green" connector on the component input?

But now you're saying it doesn't work with the scart to component adapter?

I ask, because my tv that doesn't work with the scart to component adapter also does NOTHING with the composite signal fed into the "green"component input....

I'll see what my other tvs report the signal as being with the scart to component adapter... I've never looked!

[AmmoJammo]

connect the "red" and "blue" lines from the scart to component adapter, and use the monochrome/composite output from the amiga as the "green" input, and see what happens?

[mindprober]

You....sir.....are....the MAN!!!!       I need to know how to add the "i'm not worthy" and the "beer salute" animated GIFs.....darn it, I never learned this!


Now I can also see why people needed to open these up and make adjustments. There is too much green in the signal. I know I can find some info on this that will help out. Incidentally, does anyone know a way to display SMPTE color bars on an Amiga screen? There's gotta be something out there with the long history of the Amiga in the video world (excluding the toaster).

So.....very wise of you to suggest using the working Luma signal and blending it with the other two. The fact that this works must be revealing something.

connect the "red" and "blue" lines from the scart to component adapter, and use the monochrome/composite output from the amiga as the "green" input, and see what happens?

[AmmoJammo]

There's something very weird about your screen, as mine that won't accept the signal, won't work with a composite signal fed into the "green" component input at all...

Yours probably only needs adjusting because the level of the signal from the monochrome output is higher/different than expected...

[AmmoJammo]

You may need to add a resistor or capacitor, or both, or a potentiometer, into the "green" line from the monochrome output from the amiga to be able to adjust it how you want...

[mindprober]

Actually, it is a common problem with these converters but it can be corrected by just adjusting some potentiometers inside.

Here is just one example:

http://www.neo-geo.com/forums/showthread.php?244245-RGB-SCART-to-YUV-Component-pot-knob-resistor-screw-adjustment-amp-troubleshootin

But since I am using the converter differently, you think the mono signal from the Amiga is the source? "Too much green" is what others with the converter box usually mention. Also, my photos do not give an accurate representation of what I am seeing. I was only posting to show there is color now.

You may need to add a resistor or capacitor, or both, or a potentiometer, into the "green" line from the monochrome output from the amiga to be able to adjust it how you want...

[AmmoJammo]

Twiddle away and see how you go! But I think an incorrect level on the "green" input, that you can't adjust, will mean you won't be able to get it right

But, I could be wrong, its happened before

[mindprober]

Just out of curiosity, I connected my second SCART to Component box (same seller sent me a replacement) and it did not display the same level of green, so more evidence that the box is the source.

Also, it would appear that the "green" cable is not actually the source of the green in the component signal:

http://en.wikipedia.org/wiki/YPbPr

So getting back to this clever idea you had to try this in the first place, does this conclude that this is a sync problem with what is coming out of the box? Does this help you in your quest to make your own mods?

Twiddle away and see how you go! But I think an incorrect
level on the "green" input, that you can't adjust, will mean you won't be able to get it right

But, I could be wrong, its happened before

[AmmoJammo]

Just out of curiosity, I connected my second SCART to Component box (same seller sent me a replacement) and it did not display the same level of green, so more evidence that the box is the source.

Also, it would appear that the "green" cable is not actually the source of the green in the component signal:

http://en.wikipedia.org/wiki/YPbPr

So getting back to this clever idea you had to try this in the first place, does this conclude that this is a sync problem with what is coming out of the box? Does this help you in your quest to make your own mods?

As far as I'm aware, the sync on the rgb port of the amiga should be the same as the sync on the monochrome output...

I'm wondering if your scart cable is actually wrong, as I believe they both should simply be composite sync...

Oh yeah, its not green, that's why I keep putting "green" in quotes

But it does effect the amount of green from memory...

[mindprober]

It would be fair to consider the cable as a possible contributor, as it was made to order. Something could have been wired incorrectly. How could it be tested, though? Please read previous posts on pin tests. Per djos, the Amiga RGB to SCART cable shouldn't be doing much at all.

As far as I'm aware, the sync on the rgb port of the amiga should be the same as the sync on the monochrome output...

I'm wondering if your scart cable is actually wrong, as I believe they both should simply be composite sync...

[AmmoJammo]

I've been trying this with a Sega Megadrive/Genesis... and I'm confused....

This tv won't take the composite signal, from the megadrive, on the "green" component input, and it doesn't work with the scart to component adapter...

But... it will take a composite signal from another source, and display a black and white image, so it doesn't seem to be a bi/tri level sync issue at all?

[AmmoJammo]

Megadrive update (for my own reference) it won't display the composite signal on the "green" component input at all...

it will display the "green" output from the scart to component adapter when fed into the composite input, in black and white, but it constantly drops sync....

BRB, getting my master system!

Master system does as I would expect... anything fed into the component "green" says "not support"
Anything fed into the composite input displays an image (black and white for the "green" from the component output from the scart to component adapter)

[mindprober]

Sorry to hear you are not having the same luck I am. I hope it inspires you to continue testing and possibly modifying one of these boxes to work natively.

I checked on another source for a well constructed RGB to SCART cable but the minimum cable length offered is 2m. That's a lot of unnecessary cable for my setup. I suppose I could build my own but not really wanting to take on too many projects at the moment.