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        Get extended country information (INT 21h, 65h)

        Entry:
          AH = 65h
          AL = info ID (1 - 6)
          BX = code page (-1=global code page)
          DX = country ID (-1=current country)
          ES:DI = pointer to country information buffer
          CX = size of buffer

        Return:
          AX = error code if carry set, otherwise
              CX = size of country information returned
              ES:DI = pointer to country information:
                     1 BYTE info ID
                     if info ID <> 1
                        1 DWORD pointer to information
                     if info ID == 1
                        1 WORD size
                        1 WORD country ID
                        1 WORD code page
                       34 BYTE see function 38h


        Format of country information:
                Offset  Size    Description
                 00h    BYTE    info ID
                ---if info ID = 01h---
                 01h    WORD    size
                 03h    WORD    country ID
                 05h    WORD    code page
                 07h 34 BYTEs   country-dependent info (see AH=38h)
                ---if info ID = 02h---
                 01h    DWORD   pointer to uppercase table (see below)
                ---if info ID = 04h---
                 01h    DWORD   pointer to collating table (see below)
                ---if info ID = 06h---
                 01h    DWORD   pointer to filename uppercase table (see below)
                ---if info ID = 07h (DOS 4.x)---
                01h     DWORD   pointer to DBCS lead byte table (see below)

        Format of uppercase table:
                Offset  Size    Description
                 00h    WORD    table size
                 02h 128 BYTEs  uppercase equivalents (if any) of chars 80h to FFh

        Format of collating table:
                Offset  Size    Description
                 00h    WORD    table size
                 02h 256 BYTEs  values used to sort characters 00h to FFh

        Format of filename uppercase table:
                Offset  Size    Description
                 00h    WORD    table size
                 02h 128 BYTEs  uppercase equivalents (if any) of chars 80h to FFh

        Format of DBCS lead byte table:
                Offset  Size    Description
                 00h    WORD    length
                 02h 2N BYTEs   start/end for N lead byte ranges
                        WORD    0000h   (end of table)