Compatibility unit for Turbo Pascal Version 3.00 Graphics

    UNIT:  GRAPH3

    USES:  Provides total compatibility with version 3 graphics, to include
           turtle graphics, graphics windows, colors, plotting and drawing.

    DEPENDENCY:  This unit is dependent on the CRT unit.

                                  NOTE
    Information and definitions will not be included here however, they
    can be found in the Turbo Pascal Version 3.00 reference manual.


    PROCEDURES/FUNCTIONS:

    Arc             - Draws an arc using the specified parameters.
    Back            - Moves the turtle backwards a given distance.
    Circle          - Draws a circle using the specified parameters.
    ClearScreen     - Clears the screen and homes the turtle.
    ColorTable      - Defines the color table.
    Draw            - Draws a line between specified points in a
                      specified color.
    FillPattern     - Fills a rectangle with a specific pattern.
    FillScreen      - Fills the active window with the specified color.
    FillShape       - Fills a shape with a indicated color.
    Forwd           - Moves the turtle forward a given distance.
    GraphBackGround - Sets the background color.
    GraphColorMode  - Sets up 320X200 color graphics mode.
    GetDotColor     - Returns the color value of the specified dot.
    GetPic          - Copies the contents of a specified area into a buffer.
    GraphMode       - Sets up 320X200 B/W graphics mode.
    GraphWindow     - Defines a area of the screen as the active window.
    Heading         - Returns the current heading of the turtle.
    HideTurtle      - Hides the turtle from view.
    HiRes           - Sets up 640X200 high-resolution graphics mode.
    HiResColor      - Selects the color used for drawing in high
                      resolution graphics
    Home            - Places the turtle in the home position.
    NoWrap          - Turns off wrapping of the active window.
    Pallette        - changes/activates the specified color palette.
    Pattern         - Specifies the pattern for FillPattern.
    PenDown         - Allows the turtle to draw.
    PenUp           - Disables the turtles ability to draw.
    Plot            - PLots a point at a specified point in the
                      specified color.
    PutPic          - Copies the contents of a previously saved buffer.
    SetHeading      - Places the turtle at a specified heading.
    SetPenColor     - Sets the color of the turtles pen.
    SetPosition     - Places the turtle at a specified position.
    ShowTurtle      - Allows the turtle to be visible.
    TurnLeft        - Turns the turtle left.
    TurnRight       - Turns the turtle right.
    TurtleWindow    - Defines an area of the screen as the active window.
    TurtleThere     - Check to see if the turtle is visible.
    TurtleDelay     - Sets the delay for the turtle step rate.
    Wrap            - Enables screen Wrapping.
    XCor            - Returns the X-coordinate of the turtle.
    YCor            - Returns the Y-coordinate of the turtle.