Int 21 Fn DF08  - Software Carousel - Selectively Enable/disable Menu And  [T]

   AX = DF08h
   BL = new state of keyboard (00h disabled, 01h enabled)

Return: AL = status
       00h Carousel not running
       01h successful
Program: Software Carousel is a task switcher by SoftLogic Solutions, Inc.

Note:  when the keyboard is is disabled, the user may neither access the
     Carousel menu nor switch to another memory section