INT 21 - DOS 4+ - COUNTRY-DEPENDENT CHARACTER CAPITALIZATION
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.


2165 - DOS 4+ - COUNTRY-DEPENDENT CHARACTER CAPITALIZATION