[BuckoA51]

Not a problem! I’ll get things sorted for you now.

Thanks,

Matt

[BuckoA51]

Hi,

I did contact you on your live.com e-mail address yesterday, did you not get it?

[BuckoA51]

We’ll have stock of Extra AV out within the next few days.

[BuckoA51]

since 85 isn’t a multiple of 50 or 60 I don’t think this would be all that much use as you’d get a stuttering image.

[BuckoA51]

Can’t understand why it’s not working with your Pro when it did for Rees, very strange.

Should composite video be peaking that high? I guess Atari weren’t as careful as they should have been.

[BuckoA51]

Rees did some beta testing on the OSSC Pro and his STe works with it – https://www.youtube.com/watch?v=4RJsdvM4fI4&t=877s

If you are willing can you remove the resistor from the composite video and see if that works?

[BuckoA51]

and is your system a ST with a RF modulator (composite video for sync) or without (composite sync) ?

[BuckoA51]

Ah yes seems you’re right, pin 2 can be sync or composite video.. how lovely. Do you recall Markus if your machine had RF or not? I’m just trying to narrow down the problem here.

@retro-computer-shack any joy with adjusting Analog sync Vth?

[BuckoA51]

ST actually only outputs hsync and vsync (or at least most models do), if you see TheCorfiot post above it seems some cables use a hacky way to get sync from hsync while others use composite video.

You’d have thought composite video was the better way to do it, but perhaps not. I was told composite video out has long a delay time on the sync causing the image to be shifted, but this could easily be corrected on either OSSC by adjusting backporch. I agree using a resistor on composite video seems strange but I’m no expert.

[BuckoA51]

The mystery deepens as I’ve just had a customer contact me by e-mail and his Atari ST (using SCART with composite video for sync) will not sync with OSSC Classic on 1.x firmware or OSSC Pro either.

Marqs can you open your SCART cable and determine how sync is generated? Composite video or some hack to combine H/V syncs together?

• This reply was modified 2 weeks, 5 days ago by BuckoA51.

[BuckoA51]

To say composite is the best for PS1 is a bit of a stretch. What you get with composite is noise and lack of sharpness, for some games this can actually be beneficial because sharpening up early 3D games really emphasises how low resolution and jaggy they were.

What you might want to do is play with Scaler opt->Scaling algorithm to see if any of those produce an image that’s more pleasing to you.

[BuckoA51]

Are you able to test with another TV as well see if the problem persists?

[BuckoA51]

What kind of cable are you using to connect your Archimedes to your OSSC?

[BuckoA51]

Do you know of a device which safely turns either RGBHV or RGBS into sync-on-CVBS RGB?

I think such a thing would be pretty much impossible since there’s no composite video signal left, it’s been stripped out, literally all there is is sync so where would you get the composite video from? I suppose you could transcode it on the fly from RGBS, but since we’re only talking about a handful of peculiar TVs here I doubt that anyone would want to make such a device.

I’ll address this myself, though it’s still a guess – sync-on-CVBS RGB does “use” pin 20 for R-G-B as well as combined sync, but also uses pins 15, 11 and 7 for R/G/B, otherwise it would display a composite video signal. So colors are carried over in two simultaneous ways with this RGB mode.

I’m not quite sure what you’re getting at here, pins 15, 11 and 7 are used for RGB. For an RGB signal you also need sync, this is taken from the composite video feed usually, on pin 20.

So, if you had composite video on pin 20 and no signals on pins 15, 11 and 7 you could get a composite video picture. If you had RGB on pins 15, 11 and 7 but no composite video signal, you couldn’t get anything because you need snyc for RGB.

When using RGB the composite video is ONLY used for sync, it is not used to extrapolate any colour information, something is clearly wrong with the sync processing circuit in the TV to cause this behaviour.

• This reply was modified 1 month, 1 week ago by BuckoA51.

[BuckoA51]

Can set test patterns only on TV to 576i and 480i

I’m a little confused there you said 240p was working.

256×224 would mean your PC needed to be set to 512 x 448 for a completely clean upscale, of course you’re never going to get that so you’re at the mercy of what the games doing itself regards scaling.

Try setting the PC to 720p or 960×720 and doing a 3x drop, see where that gets you.

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