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                        VIDEO CURSOR

 Video Cursor Variables and Macros - These variables and constants give you
 easy tools to combine with bit operations to display your choice of cursor
 modes.  The variables default with the cursor on and no skew which are
 detected and set by qinit at startup:

   Variable           Description
   -----------------  --------------------------------------------------------
   cursor_block       (Type: unsigned int) Cursor mode value for the full
                      cell.

   cursor_half_block  (Type: unsigned int) Cursor mode value for a half
                      block usually used for insert editing.

   cursor_initial     (Type: unsigned int) Cursor mode value detected at
                      startup.

   cursor_underline   (Type: unsigned int) Cursor mode value for the normal
                      underline.


   Macro         Value   Description
   ------------  ------  ---------------------------------------------------
   cursor_blink  0x6000  Used to alter bits 13/14 to create erratic blinking
                         on MDA/CGA cards.  (EGA/VGA cards turn the cursor
                         off.)

   cursor_off    0x2000  Used to alter bits 13/14 or can be used by itself
                         to turn the cursor off.

   cursor_on     0x0000  Used to alter bits 13/14 in modcursor to turn the
                         cursor back on.                                                     ....................................................................................