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intensevideo
============

Syntax
------

     #include <conio.h>
     void intensevideo(void);

Description
-----------

Bit 7 (`MSB') of the character attribute byte has two possible effects
on EGA and VGA displays: it can either make the character blink or
change the background color to bright (thus allowing for 16 background
colors as opposed to the usual 8).  This function sets that bit to
display bright background colors.  After a call to this function, every
character written to the screen with bit 7 of the attribute byte set,
will have a bright background color.  The companion function
`blinkvideo' (blinkvideo:.) has the opposite effect.   

Note that there is no BIOS function to get the current status of this
bit, but bit 5 of the byte at `0040h:0065h' in the BIOS area indicates
the current state: if it's 1 (the default), blinking characters will be
displayed.