9bit vga with resistors.

Oct 07, 2005 1 Replies

Don't know if it fits here or not, but since I'm using a fpga I gues it does



I've got a spartan-3 starter board and got tired of the 8color outpu



from the standard vga connector So I hooked up som E12 series resistors (570, 1200 and 2200) to ge



9bits and 512 possible colors (not evenly spread, but cool anyway)

It works pretty ok except for some strange distortions in the images



The brighter colors fades out beyond the image, leaving a kind o motion blur (although it's not moving)



And having several white pixels in a row gets the first pixel whit



and the rest fades to grey Also at the left hand side of the image all of the colors are darke than on the right hand side



As you might have guessed, I'm a newbie when it comes to this h



stuff



Bad image quality, but I think you can see what I mean from thi



shot

formatting link



Any help appreciated



((mic



Hey, I made the same mod to my board. Using 470,1k, and 2k2. I used some of the B1 port pins.

Another way to increase the colors output without modifying the board is to use dithering.

How is one to learn about alpha blending with only single bit color ?

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