Apple IIe - Apple IIe Graphics Capabilities; Introduction to Graphics Modes; Low Resolution Graphics Commands

CHAPTER 6.
APPLE lie GRAPHICS
The Apple lie has three different display modes - one text
mode and two graphics modes. These formats may be combined
into five different display formats. Both of the graphics modes
are color capable. These two modes will be discussed in this
chapter.
The Apple lie can generate some of the finest color graphics
available on a medium priced computer system ($1000-$2000).
This is quite amazing, in light of the fact that the Apple was one
of the first color capable home computers .
LOW RESOLUTION GRAPHICS
The low resolution graphics mode is used in two of the pre-
viously mentioned display formats . A graph ics-only display is
available that has a resolution of 40 x 48 pixels.* Also a graphics
plus text display is available that has a resolution of 40 x 40 pixels.
In this mode, four lines of text are located beneath the graphics
display.
Commands
The GR command is used to call the low resolution graphics
mode. This command configures the computer hardware to
display the graphics plus text format . This command also clears
the display memory so that the screen will initially be black. The
GR command can be used in a program or executed directly
from the keyboard , as can all graphics commands.
*A p ix el can be defined as a single screen coordinate.