49. Screen border
    ~~~~~~~~~~~~~
As an alternative to using teletext Mode 7, try the following at the start of
your program. Using Mode 1 or 4, it selects yellow text on a blue background,
draws a neat border round the edge of the screen, and protects it with text
and graphics windows. This still leaves you almost the full screen free to
use. Of course, there won't be as much free user memory as in Mode 7, so you
can't use this for very large programs. In Mode 1, you could in fact have a
red border, blue background, yellow text and white graphics if you wanted to
be very flash.

 10 MODE 1 :REM or Mode 4
 20 VDU19,0,4,0,0;19,3,3,0,0; :REM select yellow/blue
 30 MOVE 0,0:DRAW 0,1023:DRAW 1279,1023 :REM draw border
 40 DRAW 1279,0:DRAW 0,0 :REM draw border
 50 VDU 28,1,30,38,1 :REM set up text window
 60 VDU 24,8;8;1271;1015; :REM set up graphics window