Quote Originally Posted by FABombjoy View Post
Have you performed the adjustments in the service manual? There are a few thumbwheels that can easily change the vector alignment.

If you need to center the image on the screen, do not adjust the DAC offset control at the rear of the CPU PCB. This advice is given frequently but the correct method is to use the yoke magnets.
I have adjusted the two thumbwheels on the side of the logic board, I believe there are no other adjustments possible other than the DAC offset. I will make further adjustments since I learned that the diamond shapes at the bottom of the adjustment screen are the most important and when I was adjusting them I was trying to make the large central one perfect.

I'm afraid I already followed the advice to center using the DAC offset, as the screen was significantly off center. I have no idea how to use the yoke methods and any advice on this would be very helpful if it would improve the graphics quality.

Quote Originally Posted by FABombjoy View Post
I have seen some issues with text rendering that are impossible to adjust out, usually involving the topmost line, as is happening in your pic. There is something about the BIOS's rasterized text routines that the Vectrex can have a difficult time with. I have a project Vectrex that has text problems but I haven't had time for a proper investigation yet. Other than not being visually perfect, it doesn't have much bearing on game play which is nice.
Yes, its always the topmost or two top lines, and it only happens on certain lines of text, always the same ones and always the same amount. Is it a problem with one of the chips or on the logic board, or is it more likely a display board issue?