Ok, I have tried the shader. It looks bit like CRT. But I like to it to have 1024 x 768 pixel like the CRT monitor size in full screen mode. I can have it 1024 in Window mode though.
When I try to take screenshot of it in full screen, and I paste it into image editor, it shows black screen, so I cannot show the full screen screenshot here.
It does show 1024 when I first start the game, but when I switch between Window and full screen mode, it switches back to 640, in full screen. The only way to get 1024 in full screen is when first starting the game.