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        Communicating Applications Spec - Get external data block

        Entry:
          AX = CB0Eh
          DS:DX -> 256-byte buffer
        Return:
          AX = 0000h successful
               buffer filled
             < 0   error code (see AX=CB01h)

        Format of external data block:

        Offset  Size    Description
         00h    BYTE    CAS major version
         01h    BYTE    CAS minor version
         02h 68 BYTEs   ASCIZ path to directory containing CAS software, ends in slash
         46h 13 BYTEs   ASCIZ name of current phonebook (in CAS directory)
         53h 13 BYTEs   ASCIZ name of current logo file (in CAS directory)
         60h 32 BYTEs   ASCIZ default sender name
         80h 21 BYTEs   ASCIZ CCITT identification of fax device
         95h 107 BYTEs  reserved