Int 21 Fn 5F06  - Starlite Architecture - Unmap Drive Letter               [O]

   AX = 5F06h
   DL = drive to be unmapped (0=A:)

Return: CF set on error
       AX = error code (see #1366 at AH=59h/BX=0000h)
   CF clear if successful

See Also: AX=5F05h"STARLITE",INT 60/AX=0003h