After some testing with various DAC amplifiers, I have determined that analog input into the PET Monitor is not very good.
![Image](http://www.lucidscience.com/temp/PET9.jpg)
The pattern should fade from black to full green, but instead transitions quickly at about 40 percent.
Fixing this would require changing the actual video drive circuitry, and I won't go that far.
So I guess if I do any kind of GFX board, it will be like the others... high resolution and single shade (digital).
I did test a 720 pixel dot map though, and this Monitor is certainly capable of displaying crisp pixels.
Might try a horizontal resolution of 1024 next, but for that I need a faster microcontroller!
One interesting thing I noted though is if I feed the original PET pixel stream back into the tapped point shown in the last photo, the resulting video is just as good, possibly a little sharper.
Knowing how Commodore would shave every single part from a board, I am surprised that they left 2 extra transistors and a bunch of other passives that seem to do nothing!
Ok, that's it for this thread.
Cheers,
Radical Brad