REQ: Someone Mass-Produce Scandoubler/Flicker Fixers

[JimS]

I was looking at an FPGA experimenter board recently. It's already got the SDRAM on it. In addition, it's got a VGA port, although it is only 3 bit's per color. The companies web site has a dual port ram controller module for the fpga. There ought to be enough left to inplement a scan doubler in there.. XESS.COM

Personally, I'd rather have one that fit into the video slot, or dropped under Denise.

[JimS]

Cefa wrote:

It would be cool if you could connect them using USB2 or firewire but they are problably to slow.

Cheers

I thought of that too... I'm sure either USB2 or firewire would be fast enough. I've seen a couple FPGA boards that program through a usb2 port, and can transfer data via usb as well.
nice to think about anyway.

opalkelly.com

[JimS]

I did a quick & dirty calculation, and figure that an Amiga screen, assuming overscan and sending over the 12 bits of screen data would only need 1/4 of the USB2 bandwidth.

BTW, over on "Hack a day" there's a link to a guy who did hack a pci interface... of course he cheated by not following a number of the PCI rules..

[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.