REQ: Someone Mass-Produce Scandoubler/Flicker Fixers

[Zac67]

Dunno what you calculated with, but SHires AGA lines have appr. 1450 pixels/line x 15625 Hz x 24 bit = 544 Mbit/s - a bit too much for USB 2.0. But just how did you want to get to the video data into USB2?

[JimS]

Yeah, I'd forgotten about the Shres modes in AGA, I was thinking only of the ECS chipset. Which would be about 752pixels/line x ~15625 x 12 bit = 141mbit/sec. And I guess you're right to consider the actual horizontal frequency- so as not to overrun the maximum usb speed, I hadn't thought of that.

As for getting the video data onto USB2, I thought to tap into the Amiga directly and pick up the digital pixel data as it comes out of Denise.. no need to mess with A/D conversion.

[alexh]

Would the final product that Jens makes be 24 bit or would it be 16 bit?

It's 18-bit, and when you consider that the colour resolution of AGA (it's palette) is 18-bit (262144), there aint much point doing any more is there

There is no point contacting Jens, if I cannot source the chips at the right price point, nothing will get made. I am calling in a load of favours but its slow going.

[patrik]

@alexh:

The bits are not about being able to reproduce as many colours as ham-8, but it is about being able to produce all the colours that aga can. If it just was about how manu colours then the 8:4:4 phase5/dce scandoublers/flickerfixers wouldnt be too shabby, but as it is they cant for example produce the colour ff:05:0a - it would end up as ff:00:00 as they dont give a {bleep} about the least significant 4 bits on both the green and blue channel.


/Patrik

[Karlos]

@axelh

Remember that whilst ham8 only allows you to directly modify the 6 most significant bits of each gun, all 8 bits arrive at the DAC. If a palette colour set the lowest 2 bits of any colour, subsequent ham pixels would inherit them.

Furthermore there image displaying methods that change some of the the palette entries per scanline. Such images can show a lot more than basic 18-bit colour resolution.

[DamageX]

I wouldn't worry about the difference between 18-bit RGB and 24-bit RGB, as long as we're talking about 6 bits per component. It would be a vast improvement over 12-bit or the screwy 8:4:4 that has been mentioned.

The extra precision of 24-bit would only be noticable under certain circumstances (for instance, doing gamma correction in software instead of using the controls on your monitor)

[alexh]

Jens Schoenfeld of Individual Computers has found the parts he needs to remake the Indivision. It's being sold through softhut (because of the new EU laws proventing German OEM's selling to EU countries) under the toastscan brand.

[Dr_Righteous]

YEEEEEEEEEEEESSSSSSSSSSSSSSSSSSS!!!!!!!!!!!!!!!!! Thank you Jens! Thank you Alex! PARTYYYYYYYYYYY!!!!!

[alexh]

In the end I had nothing to do with it, except perhaps the inspiration.

[humppa]

alexh wrote:
(because of the new EU laws proventing German OEM's selling to EU countries).

There is no EU law preventing German OEMs from selling to EU countries.

Indivision will also be available from Vesalia.

[vk3heg]

alexh wrote:
Jens Schoenfeld of Individual Computers has found the parts he needs to remake the Indivision. It's being sold through softhut (because of the new EU laws proventing German OEM's selling to EU countries) under the toastscan brand.

Pitty about the price (over $200 for us, land downunder people)

[amigakit]

And of course available now at www.amigakit.com here:

Indivision Scandoubler/Flicker Fixer (External)