When using the DISPLAY-OF intrinsic function to convert Unicode characters to your current locale, any Unicode characters that have no equivalent in the current locale might not be replaced by the optional default replacement character on some UNIX platforms.
On the TRU64 platform, in order for the Unicode support to work, you need to set the ICONV_BYTEORDER environment variable as follows:
ICONV_BYTEORDER=little-endian export ICONV_BYTEORDER