You might want to print it out for reference if you have any video display problems. All VGA Display Adapters are capable of operating with a variety of different graphics modes. These modes differ by the width and height of the display and the maximum number of simultaneous colors. For example, the standard display resolution is 640 x 480. Early VGA Display Adapters could display only 16 colors at this resolution or 256 colors at 320 x 200 resolution.
Display adapters can handle higher resolution and more colors.
For instance, display mode 13H means 320 x 200 pixels with 256 colors. The lower numbered modes are all standardized because everyone copied what IBM had done. Unfortunately, SVGA developers didn't talk to each other when adding extensions to the IBM standard. As a result, they didn't use the same numbers for the new graphics modes. MS-DOS software applications come supplied with display drivers for numerous brands and models of SVGA adapters.