I found a DOS program called COLAP which will increase the contrast in DOS. It's a very nifty little program. I've also been experimenting with the Hercules emulation in DOSBox, which is totally in black and white. With a TSR called SIMCGA, I could simulate a few CGA programs in black and white, which is also very helpful, because sometimes the colors of a program make it difficult for me to use them. But I can run only a few programs in Hercules mode. What I've been searching for is a program that will change CGA, EGA, or VGA programs into monochrome (or grayscale) when they are in graphics mode. I don't know if this is even possible. I have a program called GMODE which will change the prompt screen into graphics mode, but I can't figure out a way to change a CGA program with 4 colors to grayscale, and I'm not sure it's even possible. I wish I had a monochrome mode on my monitor so that I could switch it between color and grayscale when I needed to. If anyone knows how to view all applications that use graphics mode to grayscale, I'd appreciate it if you let me know how to do it. I've found various applications to change VGA palette, but as far as I can tell they only work in Text Mode, not graphics mode.