Ted C. HowardWell, I’ve got colors. Although, not the colors I want. The “white” is very yellow. They are all very dim. And I have these vertical bars appearing as well. Not sure what’s causing that.
Ok, I’m making progress. Some tweaks to the DAC (thanks @mos_8502 and @andreasbombe ), but the thing that made the most difference is something stupid I was doing.
When I wrote the #verilog to generate the test pattern, I neglected to include the blanking interval in the output. Adding that instantly made the colors brighter!
Still a lot to do, but progress continues!
The other thing is the LCD that I'm using apparently doesn't support 640x400@70Hz (which I was planning to use for 320x200). Switching to 640x480@60Hz also improved the image.
I may need to find a CRT.