The odd columns can have a second palette of 4 pure colors. Part of the screen can be in 640x200 mode and part of it can be in 20x200 resolution. Such split modes are sometimes used in paint programs, where the menu bar is in 640x200 while the graphic is in 320x200. The Apple IIGS also has all the graphics modes found on the Apple IIc. Characters are formed by a 7x8 pixel matrix.
Text mode is monochrome but can be set to a specific color.
The background and boarder can each be set to different colors. 80x48 pixels in 16 colors. The text in mixed mode can be either 40 column or 80 column. Double Low Res and Double High Res modes can't be mixed with text. 20MB to 100MB SmartPort hard drives, but Apple IIGS users usually add an SCSI card to the system for faster hard drive access.