10 REM > BackCols
   20 REM Demonstrates background colours
   30 MODE 27:REM sixteen colour mode - use mode 12 for standard resolution monitor
   40 ON ERROR REPORT:PRINT " at line ";ERL:END
   50 COLOUR 0:REM set text foreground colour to black
   60 FOR backcol%=1 TO 15
   70   COLOUR 128+backcol%
   80   PRINT "This is background colour 128+";backcol%
   90 NEXT
  100 COLOUR 7:COLOUR 128:REM set things back to normal