Int 21 Fn 65  - DOS 4+ - Country-dependent Character Capitalization        [D]

   AH = 65h
   AL = function
       20h capitalize character
       DL = character to capitalize

       Return: DL = capitalized character
       21h capitalize string
       DS:DX -> string to capitalize
       CX = length of string
       22h capitalize ASCIZ string
       DS:DX -> ASCIZ string to capitalize

Return: CF set on error
       AX = error code (see AH=59h)
   CF clear if successful

Note:  these calls have been documented for DOS 5+, but were undocumented in
     DOS 4.x.