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Author Topic: Playstation rgb to hdmi for Amiga  (Read 2938 times)

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Offline kjmannTopic starter

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Playstation rgb to hdmi for Amiga
« on: November 13, 2019, 06:57:49 PM »
I'm really surprised that no one has thought of this. Since the US doesn't have Scart as a standard for our TV's, we have to find a better solution than scart to hdmi. Most scart to hdmi converters has too much lag for gaming. So I started looking at the hyperkin / pound cables for the retro systems and stumbled upon this solution. The Playstation adapter is a perfect fit for the amiga.
Simply cut the Playstation video plug off of the cable and wire in a DB23 plug directly. Works beautifully.
I also wired in a left and right RCA cable to the audio lines in the adapter.

Here is the adapter I used.....
https://www.amazon.com/dp/B07MYVF61Y..._8JcZDbZSP810G

Wire colors in this adapter are as follows...
Red wire=red
Blue wire=blue
Green wire=green
Black wire=sync
Brown wire=ground
White wire=left audio
Orange wire=right audio.

Other wires, purple, yellow and grey are not used.

You do not need to attach the ground to the audio RCA jacks.

I will make a YouTube video soon and post it for reference.
Hope this helps some people out. =)

-kjmann
Systems:
A500 (Originally purchased new 1989) - 3.1 ROM, 2meg Chip, 68k cpu
A500+ 3.1 ROM, 2meg Chip, 8meg Fast, 68EC020 @ 28mhz, CF Slot, SD Slot. (Classic 520 accelerator board)
 
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Offline kjmannTopic starter

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Systems:
A500 (Originally purchased new 1989) - 3.1 ROM, 2meg Chip, 68k cpu
A500+ 3.1 ROM, 2meg Chip, 8meg Fast, 68EC020 @ 28mhz, CF Slot, SD Slot. (Classic 520 accelerator board)
 

Offline Tygre

Re: Playstation rgb to hdmi for Amiga
« Reply #2 on: November 14, 2019, 02:51:47 AM »
Wow, very cool! 8)

Could you post some screenshots to show how well it works, please?

Cheers! :)

Offline kjmannTopic starter

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Re: Playstation rgb to hdmi for Amiga
« Reply #3 on: November 14, 2019, 04:07:37 PM »
Here you go....
Systems:
A500 (Originally purchased new 1989) - 3.1 ROM, 2meg Chip, 68k cpu
A500+ 3.1 ROM, 2meg Chip, 8meg Fast, 68EC020 @ 28mhz, CF Slot, SD Slot. (Classic 520 accelerator board)
 
The following users thanked this post: Tygre

Offline F0LLETT

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Re: Playstation rgb to hdmi for Amiga
« Reply #4 on: November 15, 2019, 12:10:44 PM »
This is technically a Scart to HDMI convertor. So why would this have less lag?
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Offline psxphill

Re: Playstation rgb to hdmi for Amiga
« Reply #5 on: November 17, 2019, 02:21:59 AM »
This is technically a Scart to HDMI convertor. So why would this have less lag?

How much lag a converter has depends on how much it was designed to have.

You can create a zero lag converter if you wanted, although that reduces options for upscaling algorithms.

However it could also be cheaper if you don't need lots of frame buffer ram.
 

Offline BozzerBigD

Re: Playstation rgb to hdmi for Amiga
« Reply #6 on: November 17, 2019, 01:28:22 PM »
The lag is minimal on the Mega Drive however PAL Sonic The Hedgehog is laggy compared to the emulated Sonic Mega Collection version I play on the PS2 because of the hole NTSC 60hz vs PAL 50hz performance hit UK gamers had to suffer because the PAL version was never optimised and used the same code as the Japan and US versions!
"Art challenges technology. Technology inspires the art."

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Offline psxphill

Re: Playstation rgb to hdmi for Amiga
« Reply #7 on: November 17, 2019, 07:08:10 PM »
The lag is minimal on the Mega Drive however PAL Sonic The Hedgehog is laggy compared to the emulated Sonic Mega Collection version I play on the PS2 because of the hole NTSC 60hz vs PAL 50hz performance hit UK gamers had to suffer because the PAL version was never optimised and used the same code as the Japan and US versions!

That isn't lag. It's also not due to optimization, trying to match the speed would have made it look jerky.
 

Offline BozzerBigD

Re: Playstation rgb to hdmi for Amiga
« Reply #8 on: November 17, 2019, 10:56:15 PM »
Well a 17% slow down (including the music) was not an acceptable solution for PAL regions IMHO.
"Art challenges technology. Technology inspires the art."

John Lasseter, Co-Founder of Pixar Animation Studios
 

Offline BozzerBigD

Re: Playstation rgb to hdmi for Amiga
« Reply #9 on: November 18, 2019, 12:02:01 AM »
Quote
That isn't lag. It's also not due to optimization, trying to match the speed would have made it look jerky.

You're so wrong anyway! They could have optimised the game to run faster if they'd cared!

https://gizmodo.com/why-does-sonic-the-hedgehog-run-faster-in-america-1787504338

Quote
So what? Well, these systems run at different frequencies, which meant that the same game running at 30 frames-per-second in the US would output at 25 in the UK. Hence, one slow hedgehog.

Of course, this is an oversimplification. Many games were PAL-optimized to run normally—the first Sonic the Hedgehog just wasn’t one of them. Also, thanks to digital TV, almost none of this stuff matters anymore.


https://forums.sonicretro.org/index.php?threads/sonic-the-hedgehog-50hz-effect.35284/

Quote
As a retro programmer, I can see why games were hardly optimized for PAL back in the day. Too many things about the engine were locked to the frame rate, such as animation delays and physics constants. Adjusting such things would mean tweaking fractional numbers, which back then were always represented as fixed-point values, and had limited precision. The lack of precision would cause small errors between the two versions to accumulate over time, and eventually things would be noticeably out of sync. There are also problems caused by limitations in the engine... For exemple, if the engine can only scroll a maximum of 16 pixels per frame (due to how fast the map can be decoded and the amount of changes that can be made to the tile map), you can safely allow Sonic to move that fast. But on PAL, which has less frames per second, you'd need to move more pixels per frame to cover the same distance, and the scrolling system would simply not be able to keep up. In this case, supporting both PAL and NTSC would mean slowing down the NTSC version, which would be unacceptable.

EDIT: Well, I just played the first act of all 4 games and I have to say that the problem is not as bad as I remembered (the effect is much more pronounced in Sonic 1, due to the slower music constantly reminding us that everything is slower!). If I had only played the games in 50Hz, I'd probably have loved them just as much. And if I could only play them in 50Hz from now on, I'd still do it. It's still Sonic, just a bit slower. After a while you get used to it. =)
« Last Edit: November 18, 2019, 12:06:22 AM by BozzerBigD »
"Art challenges technology. Technology inspires the art."

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Offline BozzerBigD

Re: Playstation rgb to hdmi for Amiga
« Reply #10 on: November 18, 2019, 12:10:17 AM »
... so they sould have at least corrected the slow music on the PAL version even if the pixel movement per frame could not be increased for the PAL version.
"Art challenges technology. Technology inspires the art."

John Lasseter, Co-Founder of Pixar Animation Studios
 

Offline BozzerBigD

Re: Playstation rgb to hdmi for Amiga
« Reply #11 on: November 18, 2019, 12:15:01 AM »
Even more accurately explained on link below

https://www.reddit.com/r/SEGAGENESIS/comments/1uledp/why_is_the_pal_version_of_sonic_1_so_slow/cejbwqg

... Sonic 2, 3 etc were optimised to adjust for the slow down.
"Art challenges technology. Technology inspires the art."

John Lasseter, Co-Founder of Pixar Animation Studios
 

Offline mindprober

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Re: Playstation rgb to hdmi for Amiga
« Reply #12 on: November 22, 2019, 04:04:11 PM »
Looking forward to seeing your video on this.

 

Offline Tygre

Re: Playstation rgb to hdmi for Amiga
« Reply #13 on: December 16, 2019, 03:11:40 PM »
Here you go....

Hi @kjmann

Could you also post a picture of your converter?

Cheers!