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These functions deal with displaying text in both graphics and text modes.
 This type of text output can be displayed in only one size.

This text is displayed using the  _outtext and  _outmem functions.  The
output position for text follows the last text that was displayed or can be
reset (see the  _settextposition function).  Text windows can be created
(see the  _settextwindow function) in which the text will scroll.  Text is
displayed with the current text color (see the  _settextcolor function).

The following functions are defined:

_clearscreen
    clear the screen and fill with the background color

_displaycursor
    determine whether the cursor is to be displayed after a graphics
    function completes execution

_getbkcolor
    get the background color

_gettextcolor
    get the color used to display text

_gettextcursor
    get the shape of the text cursor

_gettextposition
    get the current output position for text

_gettextwindow
    get the boundary of the current text window

_outmem
    display a text string of a specified length

_outtext
    display a text string

_scrolltextwindow
    scroll the contents of the text window

_setbkcolor
    set the background color

_settextcolor
    set the color used to display text

_settextcursor
    set the shape of the text cursor

_settextposition
    set the output position for text

_settextwindow
    set the boundary of the region used to display text

_wrapon
    permit or disallow wrap-around of text in a text window