PlayStation Development Network

Hi

I was wondering today, why is there no possibility, to plug ps1 via component cable which is ok for ps2 and ps3?

Why is there so big problem to show image through it with ps1?

Regards .


Edit: sneaking on the internet i found this nice little thing: http://www.amibay.com/showthread.php?t=40575 Does someone of you guys have this? Pretty rare thing i guess.

Because PS1 can't produce YPbPr component signal. It does Composite (CVBS), S-Video and RGB.

On PS2 R, G and B pins double for component and you have to manually toggle between RGB and YPbPr (in BIOS).
In that configuration G pin (now Y) outputs sync while in RGB mode (which is same as in PS1) it doesn't.

If you were to modify PS1 to output sync on green you could use that cable with a SoG (Sync on Green) RGB monitor.

I have something pretty similar to that, but I would be sceptical of the seller listing that one as "official".

The unit I have plugs into the AV port and also takes its power from the memory card slot.

The picture quality isn't great but the main problem is the refresh rate. Most TFT monitors I plug it into complain about the sync being out of range. The picture quality isn't good either, the colours are a bit washed out and I get a much better picture by using a decently quality RGB start lead on my TV over that via the VGA port.

I've also bought a Component cable for PS1, but it only brings B&W picture, so it's useless, works only with PS2/PS3, which support YPbPr-signal. RGB-cable is the way to go, hard to find, but if you find, picture quality improves mutch.

The PSX doesn't support YPbPr, but you can use S-Video though that if you rework the cable.

It supports RGB (japanese SCART) too.

RGB totally rulez!

Back in PSX era, I used to use S-Video all the time.

Today the best solution to play PS1 games on first PlayStation are AV/RGB to HDMI Upscaler/Converter, over the conversion from AV to HDMI do a great work on HDTV with better image quality! check this example: ...it's a lot better than the SLPH-00016 upscan for PSX, but, aware of the cheap chinese low cost products AVtoHDMI in white mini box or similar

I find it's easier to get an old CRT TV and drive the cathode RGB guns directly from RGB out of the console. Problem is, you need an amp to drive the cathodes because RGB from a PSX is ~0.7V, where as the cathodes require a bit of a higher voltage. The cathode voltages depend on the TV, so use a voltmeter to check and try to match them with the amplifier. It will work on a lower voltage, but the picture will be dim. It's best to add potentiometers to the back of the guns so you can fine tune them according to your likeliness.

As for the sync, just feed the C-Sync signal to the RF, Video 1 and Video 2 pins on the driver IC. That way, as soon as you turn the TV on, no matter what channel it is on, it will always display your picture. This mod will now render the TV as a dedicated RGB TV only, so unless you add a bunch or switches or make yourself a circuit that will use something like an ATMEGA328 with mosfets to control everything via a single button, it's stuck like that.

I've also found you can drive the on screen display chip (aka "Jungle IC"), but most of them use digital RGB and not analog RGB, so you wont see gradients for example.

I have a really big and old NEC CRT that I will try to get working using the direct gun driving method. I will start a worklog so that others can see how to do it.

*UPDATE*
Here we go: http://www.psxdev.net/forum/viewtopic.php?f=62&t=723

Shadow wrote:I find it's easier to get an old CRT TV and drive the cathode RGB guns directly from RGB out of the console.

That is mental, I like it.

It should be possible to modify the PS1 to output YUV, or do it externally.

http://shmups.system11.org/viewtopic.php?f=6&t=31989
http://www.sega-16.com/forum/showthread ... and-layout
http://www.neo-geo.com/forums/showthrea ... -Video-Out

As long as you don't need a scaler the rgb to yuv conversion should be quite a simple circuit.

These may be a cheap starting point http://www.ebay.com/itm/NEW-SCART-TO-CO ... 4aab4b988f

http://www.ebay.com/itm/NEW-SCART-TO-CO ... 4aab4b988f

They may be lying though and they might expect the device to support outputting YUV over the RGB pins, without buying one and trying it you can't really tell. Maybe send them a question and see if they'll refund you if it doesn't do what they claim? You'd need a PS1 to RGB scart and a female to female scart convertor.

http://www.ebay.co.uk/itm/like/37123100 ... 0&ff14=108

If you want a CRT then use a CRT, if you just want the best picture possible from your ps1 to your large flat screen TV then it should be possible to do it.

If all you need is SCART why do not but the normally released AV to SCART? there is official and unofficial versions around...



In future will have only HDTV with 8K and more, HDMI 2.0 and superior, DisplayPort 1.X and other interface, the SCART will not have future on other TV. I have Sony 4K 55' display, where the hell I use SCART? XD for this reason think the mini upscaler and converter to HDMI working fine.

If have better and more easy solution (without need to modify your console) let me know!
Of course can play PSX games on PS2 and from PS2 use the PS3 composite cable to cost like gold! XD

NetYaroze wrote:In future will have only HDTV with 8K and more, HDMI 2.0 and superior, DisplayPort 1.X and other interface, the SCART will not have future on other TV. I have Sony 4K 55' display, where the hell I use SCART?

This thread is about using component YUV from PS1, not SCART. The point is valid that one day TV's won't have component either, but it's easier to convert RGB to YUV than it is to HDMI. You can buy converters, but they are relatively expensive and not as cool. I'd rather not use an upscaler in any case.

The PS3 is a pure software emulator and not a very accurate one at that, the PS2 is part software and part hardware emulator and is better but not 100% accurate either.

Why did the SCPH-1001 have separate audio/video outputs in addition to the standard A/V multiout?

stvincent wrote:Why did the SCPH-1001 have separate audio/video outputs in addition to the standard A/V multiout?

It was based on the SCPH-1000, and at that point many Japanese TV sets used custom AV cables - but they normally all had RCA jacks on the end, because that's what camcorders used. They also wanted to use the same connector arrangement that Sony camcorders used, since that meant you could use the same RF modulator unit (That's why the video and L/Mono outputs are that precise spacing and have a 5V power socket between them to run the RF unit).

The original SCPH-1000 design also had a S-Video socket on the rear panel (between the composite video output and the multi-AV), but this was specific to this model.

PS1/PSX can output real C-Sync, besides R G B.

For that you need to get the signal directly from RGB (normally from CXA1645 or H7240 or Sony A2160) IC.

CXA1645 pin 10
H7240 pin 14
A2160 pin 14

For audio, L (left) is called mono too, and R (right) is just the other audio channel.

Here is the SCPH-1000 photo:


More infos:
http://www.taringa.net/comunidades/play ... e-ps1.html