INT 2F U - DOS 3.3+ DISPLAY.SYS internal - GET CODE PAGE INFORMATION
        AX = AD03h
        ES:DI -> buffer for code page information (see below)
        CX = size of buffer in bytes
Return: CF set if buffer too small
        CF clear if successful
            ES:DI buffer filled
SeeAlso: AX=AD01h,AX=AD02h

Format of DOS 5.0-6.0 code page information:
Offset  Size    Description
 00h    WORD    number of software code pages
 02h    WORD    ??? (0003h)
 04h    WORD    number of hardware code pages
 06h  N WORDs   hardware code page numbers
      N WORDs   software (prepared) code pages (FFFFh if not yet prepared)

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