Do I need a UAV to fix this ?

[ACML]

On 8/17/2022 at 8:21 PM, bob1200xl said:

I think you can cure jailbars by leaving C60 in the board.

 

Bob

I think Bob may be addressing both?

[Ricky Spanish]

1 hour ago, ACML said:

I think Bob may be addressing both?

More than likely. He knows the 1200XL that's for sure !

 

[+mytek]

@bob1200xl does the 100pf (C60) simply limit frequency response in the Luma amplifier that follows?  If so I can definitely see how that would minimize jail bars which are a higher frequency effect, but wouldn't it also take the crispness out of the image, making text look soft and almost out of focus?

 

Edit: on further thought 100pf isn't much, so whatever filtering occurred would be minimal.

[Ricky Spanish]

Got my Hercules Workshop Atari color video cable (composite video) - 800 XL XE (shielded) (6 foot) today. It definitely helped with the colour bleed through. The video in post No.1, all lines are now crisp (no bleeding) but the multi-colour remains.

[+Stephen]

1 hour ago, Ricky Spanish said:

Got my Hercules Workshop Atari color video cable (composite video) - 800 XL XE (shielded) (6 foot) today. It definitely helped with the colour bleed through. The video in post No.1, all lines are now crisp (no bleeding) but the multi-colour remains.

If you're using composite video, the "multi-colour" issues will always be there.  The only way to not have that is with s-video (or RGB).

[Ricky Spanish]

Not a problem. It just an very specific scenarios where it draws single  white lines. Everything else looks really good. 

[ACML]

I finally had a chance to try returning the 100pf capacitor to C60 to see if the jailbars would be diminished.  On my test, the presence of or absence of C60 does not see to show a difference wrt jailbars (see photos).

This is without C60 installed (i.e. open)

 

This is with a 100pf capacitor installed at C60

 

Don't know how good the pictures will show, but in realtime, I could not tell that the presence of C60 made any difference.  The intensity of the jailbars appeared unchanged. You mileage may vary. Anyone else try this?

 

And yes, I used the Hercules cable direct to an S-video monitor.

 

Edited September 25, 2022 by ACML

[Ricky Spanish]

Looks much different than mine with Hercules composite cable. Haven't done the capacitor mod.

(click on pic to zoom in) 

Looks way worse on a modern monitor.

Edited September 25, 2022 by Ricky Spanish

[ACML]

You are saying "composite".  Have you tried using S-Video?  The quality of a Y/C "separate" video is a much clearer and sharper image.  Composite is basically like RF and usually disappointing.

 

[Ricky Spanish]

2 minutes ago, ACML said:

Have you tried using S-Video?

Don't have or can find anything S-video other the my 60" plasma. But using that for my 1200 is out of the question.

I generally have no complaints with the CRT other than some color bleeding. (see vid in post #1).

[ACML]

For $32, you can buy a S-video to HDMI converter.

https://www.amazon.com/SUNNATCH-Converter-S-Video-Composite-Upscale/dp/B08ZYKC47R/ref=sr_1_22_sspa?crid=3N40SWB6T58MU&keywords=etekcity+s-video+to+hdmi+converter&qid=1664133575&qu=eyJxc2MiOiIxLjM0IiwicXNhIjoiMC4wMCIsInFzcCI6IjAuMDAifQ%3D%3D&sprefix=etek+city+s-video+to+hdmi+converter%2Caps%2C77&sr=8-22-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyNE5PVkVOUEdWQ0tHJmVuY3J5cHRlZElkPUEwMjMwOTI3MVpKNjlWNEFYWlM0NyZlbmNyeXB0ZWRBZElkPUEwNDkxMDMyMU00VFNIUjkwNEs4NCZ3aWRnZXROYW1lPXNwX2J0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

 

[Ricky Spanish]

Is that what you use with your above pic ? 

Mine compared to Altirra set to best video:

Edited September 25, 2022 by Ricky Spanish

[Ricky Spanish]

Seems all the chips sit on sockets. Where to where does the chroma fix go ? Thanks ! 

 

[ACML]

The ClearPic2002 mod has the pickoff point for chroma "Add a wire from the junction of R27 and C61 to J2-5 (the empty pin on the video DIN connector)".  I don't know if you have to complete the ClearPic2002 mod for this to be a good point.

 

[mimo]

On 9/25/2022 at 8:43 PM, Ricky Spanish said:

Is that what you use with your above pic ? 

Mine compared to Altirra set to best video:

From a composite signal I'd be happy with that!

[Ricky Spanish]

4 hours ago, mimo said:

From a composite signal I'd be happy with that!

Haha don't get me wrong, I am happy with it. But if I can fix that colour bleed I mean why not.

[Ricky Spanish]

Guess its ain't bad. Some rainbow artifacts with composite video.

[CommodoreDecker]

On 8/15/2022 at 8:24 PM, Rybags said:

It's NTSC artifacting caused by the hires video signal being interpreted as colour information when using RF or composite video input.

 

You need to use S-video.

2 problems though - some devices actually combine it into composite which will still produce artifacting, and S-video is pretty dead as a standard and not included on TVs these days.

 

 I bought a s-video to HDMI convert off of Amazon for $40. Does a good job... it also does composite, but s-video is a lot sharper.  I'm amazed composite lasted longer for new sets (though many models require an adapter cable going from 3.5mm 3-lead male connector to the individual composite/l-audio/r-audio female RCA jacks rather than direct connections... )

 

 

[CommodoreDecker]

On 9/25/2022 at 2:23 PM, ACML said:

For $32, you can buy a S-video to HDMI converter.

https://www.amazon.com/SUNNATCH-Converter-S-Video-Composite-Upscale/dp/B08ZYKC47R/ref=sr_1_22_sspa?crid=3N40SWB6T58MU&keywords=etekcity+s-video+to+hdmi+converter&qid=1664133575&qu=eyJxc2MiOiIxLjM0IiwicXNhIjoiMC4wMCIsInFzcCI6IjAuMDAifQ%3D%3D&sprefix=etek+city+s-video+to+hdmi+converter%2Caps%2C77&sr=8-22-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyNE5PVkVOUEdWQ0tHJmVuY3J5cHRlZElkPUEwMjMwOTI3MVpKNjlWNEFYWlM0NyZlbmNyeXB0ZWRBZElkPUEwNDkxMDMyMU00VFNIUjkwNEs4NCZ3aWRnZXROYW1lPXNwX2J0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

 

 

Yup, that's the one.

[Ricky Spanish]

4 hours ago, CommodoreDecker said:

 I bought a s-video to HDMI convert off of Amazon for $40. Does a good job...

Care to post a pic of the 'ready prompt' screen & the ram/rom screen in the self tester with your HDMI convertor ? I want to compare it to mine, thanks. 

[Ricky Spanish]

So whats the simplest way to hook up chroma ? Thanks !

[Beeblebrox]

So whats the simplest way to hook up chroma ? Thanks.. 

 

See Acml's post above from Tuesday.

[ACML]

13 hours ago, Ricky Spanish said:

So whats the simplest way to hook up chroma ? Thanks !

Here it is using the Clearpic2002 modification.

Edited September 29, 2022 by ACML

[Ricky Spanish]

6 hours ago, ACML said:

Here it is using the Clearpic2002 modification.

So I just solder a wire between the two ?

[Beeblebrox]

On 9/27/2022 at 4:28 AM, ACML said:

The ClearPic2002 mod has the pickoff point for chroma "Add a wire from the junction of R27 and C61 to J2-5 (the empty pin on the video DIN connector)".  I don't know if you have to complete the ClearPic2002 mod for this to be a good point.

 

So as per above instruction. Acml's pic shows location of the r27 and c61. A wire from those to pin 5 of the din.