PlayStation 1 / PSone Colour Correction Modification

Early PS1s have the clock divider change from 12 to 15 when switch to NTSC.

(Actually same thing as the Mega Drive switching from PAL to NTSC)

And so without adding an 4.43MHZ oscillator, you're left with only working RGB on a early PAL PS1 working in NTSC mode. Same with NTSC PS1 running in PAL mode.

Because newer PS1s have the chroma carrier come from the PLL clock gen chip ( the chip which generates clock from crystal whose frequency is 17mhz for pal or 14mhz for NTSC) the GPU clock divider is unused.

So what cybdyn wrote makes perfect sense. :shrug:

 

also newer ps1 has different generator IC that works with 17(pal) / 14 - (ntsc) mhz.

 

I said that already here:

 

I see, but if you have a 12f Xtal another redundant oscillator isn't REQUIRED. It may be more convenient to install a separate oscillator, but never necessary since all PAL consoles must have a CB source. Is it certain that the divider selection isn't accessible from outside the chip? Perhaps it's looped back. Since you mentioned 12/15f, if the VDP uses that for the pixel clock (also like the MD), then the timing and aspect ratio will be 1% off out of region, hm.

 

l_oliveira - sorry, you were right

 

I think that is not really going to affect the video too much, maybe cause the horizontal to be 1 pixel offset perhaps ?

A lot of people do run their system with the original clock crystal in place and just stick to RGB. Anyone would have complaint already if the offset was something too bad, no ? :nod:

And the color burst clock divider is a quite obscure detail of the PS1 hardware so I am sure you should not be bothered with not knowing about this minor detail ... :thumbsup:

It's behavior even varies from model to model so that can get pretty confusing. Like I mentioned on another thread, the 208 pin type of GPU has two clock inputs and you can hook the appropriate crystal to each input and have the correct CB frequency on both modes. :thumbsup:

 

Is there some reason Haunted isn't banned by now? Telling Calpis to go fuck himself no less than twice that I can recall simply because he was correct seems like reasonable grounds IMO.

 

I gave him that link, to remark his comment. All the other stuff he said was fine.

Fine with me if I get banned anyhow :Rock:

 

Hm, I guess you were offended. My comment was a mistyped rhetorical question, as a joke, referencing something that you really don't need, like a redundant oscillator (I wasn't wrong, but I admit a little misinformed not knowing about the inaccessible internal divider). I'm surprised you even read that since you seemed to ignore everything else which gets aggravating.

You don't care if you're banned? Come on now, Kiddo. I was a teen on the internet once too, I've been overconfident once or twice, I understand. Time to start getting real though. You have things you want to achieve, if you honestly want to achieve them take your Ritalin and listen to what people tell you, especially when you're asking for help. When you don't understand what they say, investigate instead of instigating drama. That's the way learners go about things. You're young, but if you don't start with the serious attitude soon you WILL be surpassed by your technical peers--a good attitude is the least of which you'll need to do great things. Maybe you aren't competitive and really don't care, but it seems like you are and do.

 

Wow. That was insightful.

I respect your answer and I thank you personally for telling me where my weakness is. I was a little offended by your remark but anyway, it is the Internet, and it is a place where anyone say what they want to who they want. It just got to me a little. After all, I did tell you off a while back. But I did apologise once I found out I was being an arrogant prick towards you.

I honestly do not care if I get banned. If people want me off of there forums, then I respect that. It would be sad though because I don't get to share my projects with my fellow friends on ASSEMbler.

 

so many words. but nothing about topic.

If I wrote same things - so someone answered that sounds like BULLSH@T, Even if I'm not from Texas )))

 

Because Official cables offer a better quality picture. :thumbsup:

Wouldn't part with my official PS2 SCART cable.

 

Darn, I'm jealous... I've been after one for, in the parlance of our times, "like a thousand millennia"

 

I have an official PS1 SCPH-1052 RGB SCART cable (even rarer than the aforementioned PS2 one) and a Blaze one. To my eyes, there is no perceptible difference in image quality. I only have the official cable because it was bundled with one of my PS1 consoles that I got recently; I would not have bothered to waste my time and search for one otherwise, and then pay over the odds for it.

It was a pleasant surprise. The seller must not have known the difference between the composite cable + SCART adapter and the official RGB cable. But I was relieved when I compared the two and found no difference. Therefore, if you have a decent 3rd party cable such as the Blaze one, I assure you that you are not missing out on anything. Do not waste your time any longer, and save your money.

 

Maybe the officials are gold plated or insulated better. All Sony products (IIRC) have an iron ferrite core. I think it just helps with some noise on the line and the gold prevents corroding pins in the end.

 

My comparison was with a BLAZE SCART cable.

Image quality is the same, but with the two compared in photos it's clear to see the better colours provided by the official cable.

Of course, that's not to say an unofficial cable isn't still great - just not the very best.

I got my official PS2 cable when I bought my TEST PS2 on this forum, don't think the seller factored in the rarity to the cost.

The cable is like 8mm thick, just feels like a good quality cable.

 

The official cable must have resistors in the link :shrug:

 

You'd think this, but it's not always true. Years ago, I had a widescreen CRT that could handle PAL and NTSC, but not PAL60.

It drove me nuts because I had an imported version of Tales of Symphonia that I couldn't play because PAL Gamecubes only output PAL60. It handled my NTSC-J PS2 just fine, however.

(Actually, it handled PAL PS2 games in "60Hz" mode just fine, too, which leads me to suspect that "60Hz" on a PAL PS2 is just NTSC.)

 

That is because it is. No PAL PS2 game uses true "PAL60"; it just switches to NTSC mode instead when you select the "60Hz" option. Although you can enforce real PAL60 mode with the GSM application.

 

RGB lead avoids the pal/ntsc thing anyway remember.