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 Post subject: Aurora Dido Jr
PostPosted: Tue Feb 05, 2019 3:47 am 


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Joined: 20 Aug 2016
Posts: 1370
Broke out the Dido Jr again today. It doesn't have a thread and I think it deserves one. It could be a useful budget machine for lots of gamers.

Random thoughts:

I did a Leo Bodnar test. Latency varied between one and two frames at any given time. I am guessing the machine always maintains a full buffered frame and the additional variable latency is related to some kind of frame rate conversion. Even with the Leo Bodnar and the Dido Jr both outputting "matching" 60Hz frame rates, it was there. The latency jumps to about two frames, drops to a single frame, and jumps back to about two frames. Worst case was about 33ms.

** The Dido Jr's claim to fame is plug and play tate mode rotation with nice even scanlines and it does the job pretty well. It's definitely the easiest and cheapest way to get it done right now. **

I'm not a huge fan of the 240p upscaling, but I have gotten it to accept 240p over composite and svideo. As far as I can tell, it handles it properly and doesn't try to deinterlace 240p at all. Unfortunately, I can't get it to accept 240p over RGB or component video. It refused to handle component, RGBHV, RGB composite sync, and RGBS 240p. It's too bad it won't take 240p over RGB.

I'll hook up the Atari 2600 later and throw a few torture tests at it. From what I can tell, the video inputs have some tolerance for VCR inputs and it might hold sync with some tricky games. Lots of video processors choke on Atari.

With svideo, N64 Resident Evil 2 is seamless and all transitions between screens are seamless. Same thing when switching between 480i and 240p with the SNES. Because the Dido Jr performs frame rate conversion, this isn't really shocking, but that's something it does. I wish it accepted 240p as RGB. :(

The Dido Jr also has programmable output. I decided to try downscaling 480p to 240p. It works well. Just add a custom resolution. The results are pretty good and my picky Sony TV has no issues accepting the output. If you're getting priced out of the Corio 2 and Emotia downscaling market, the Dido Jr does it, too. You can turn off the scaling filters for a reasonably sharp output.

Honestly, the frame rate conversion on the Dido Jr isn't terrible when compared lots of other frame rate conversion I've seen. I have a few machines where I can see nasty tearing. The Dido is much more subtle. I even had a very expensive Samsung television that used frame rate conversion and the results were much worse than the Dido Jr.

I didn't bother with deinterlacing. I remember being unimpressed before. It's not 4:4:4, so 480p upscaling isn't going to win much praise.

FWIW, it accepted OSSC linex2, x3, and x4 and outputs 1080p. Although, I doubt most people would use this one as an upscaler without using the rotation.

If you need a tate mode solution or you want 240p output, it might be worth getting one at the right price.
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 Post subject: Re: Aurora Dido Jr
PostPosted: Tue Feb 05, 2019 10:55 pm 


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Joined: 06 Feb 2005
Posts: 804
Location: Italy
That's interesting. I knew this Dido thing could perform rotation but not that it would take custom timings too - this, along with legacy inputs, makes it a desirable machine indeed. I might snatch one down the line.. provided that it doesn't shoot up in price that is. In all honesty, I don't necessarily need it, but the same goes for a lot of stuff I've piled up in the years, so.. :lol:

Thanks for sharing your findings!


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 Post subject: Re: Aurora Dido Jr
PostPosted: Fri Feb 08, 2019 9:22 pm 



Joined: 12 May 2013
Posts: 428
Xer Xian wrote:
That's interesting. I knew this Dido thing could perform rotation but not that it would take custom timings too - this, along with legacy inputs, makes it a desirable machine indeed. I might snatch one down the line.. provided that it doesn't shoot up in price that is. In all honesty, I don't necessarily need it, but the same goes for a lot of stuff I've piled up in the years, so.. :lol:

Thanks for sharing your findings!

As long as reddit/youtube don't declare it to be the ULTIMATE GRAIL OSSC COMBO the price should be safe :P. High latency should help curb interest too.

At Orange: How'd the Atari testing go?


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 Post subject: Re: Aurora Dido Jr
PostPosted: Fri Feb 08, 2019 9:32 pm 


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Joined: 20 Aug 2016
Posts: 1370
Lord of Pirates wrote:
Xer Xian wrote:
That's interesting. I knew this Dido thing could perform rotation but not that it would take custom timings too - this, along with legacy inputs, makes it a desirable machine indeed. I might snatch one down the line.. provided that it doesn't shoot up in price that is. In all honesty, I don't necessarily need it, but the same goes for a lot of stuff I've piled up in the years, so.. :lol:

Thanks for sharing your findings!

As long as reddit/youtube don't declare it to be the ULTIMATE GRAIL OSSC COMBO the price should be safe :P. High latency should help curb interest too.

At Orange: How'd the Atari testing go?


Oops. I forgot. :)

I got distracted testing for chroma subsampling on my video processors.

I'll circle back to it and post it here.
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 Post subject: Re: Aurora Dido Jr
PostPosted: Tue Jul 23, 2019 9:48 am 



Joined: 31 Jan 2018
Posts: 22
Is the Dido ok to just rotate 90° analog sources (RBG-Scart/BNC signal from Saturn, PS2 or HAS Supergun) to analog CRT (consumer TV)?
Is there anything cheaper and plug and play?
No need for OSSC\FM compatibility.


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 Post subject: Re: Aurora Dido Jr
PostPosted: Tue Jul 23, 2019 10:12 am 


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Joined: 06 Mar 2006
Posts: 11923
Location: Germany
Quote:
Is the Dido ok to just rotate 90° analog sources (RBG-Scart/BNC signal from Saturn, PS2 or HAS Supergun)

no, see opening post above.

Quote:
to analog CRT (consumer TV)?

You can't use a rotation unit in front of a 15khz TV without either going interlaced or losing lots of resolution.


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 Post subject: Re: Aurora Dido Jr
PostPosted: Tue Jul 23, 2019 10:18 am 



Joined: 31 Jan 2018
Posts: 22
Thanks, I'll just rotate the screen then. ^^'


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 Post subject: Re: Aurora Dido Jr
PostPosted: Tue Nov 05, 2019 7:32 pm 


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Joined: 27 Dec 2012
Posts: 172
Location: Chicagoland, IL
if anyone is looking for one of these, this looks like a decent price (29.99 + 18 ship):

https://www.ebay.com/itm/372746892306

I just scooped one myself, 4 left in stock


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