Some applications will override this setting and select the number of columns for you. Many games and educational applications are designed for a 40-column display.
If you have a color display, you can choose the color of your text, background, and border from 16 colors. If you have a monochrome monitor, you can choose the shade of your text, background, and border from black, white, or 14 shades of gray. These settings affect only text-based applications.
NTSC color monitors switch to black-and-white mode to display text, so the text and background colors you select with the Control Panel will show up as shades of gray instead of in color. Only the border will be displayed in color.
As you change one color or shade to another by using Left Arrow and Right Arrow, the Control Panel displays the name of the color you've chosen and shows you what your selection looks like.
If you are using an NTSC color monitor, the colors you select won't show up in color while you're using the Control Panel Program or other text-based applications. You will see the text and background in color only when you're using graphics-based applications that display text In the text portion (the bottom four lines) of the graphics screen.