Int 2F Fn 14FF  U - Dr Dos 5.0 Nlsfunc - Prepare Code Page                 [U]

   AX = 14FFh
   BX = code page (see #1446 at INT 21/AX=6602h)

Return: AX = ???
   ZF set if AX=0000h

Notes: DR DOS 5.0 NLSFUNC returns CF set and AX=0001h if AL was not 00h, FEh,
     or FFh on entry.
   passes codepage preparation request to each character device supporting
     the generic IOCTL call

See Also: AX=14FEh,INT 21/AX=440Ch,INT 21/AX=6602h