Multilingual Snags
With Mac OS X version 10.0.0 began a short era (that ended with Mac OS X version 10.2 Jaguar's release) where Apple offered two types of installation CDs: 1Z and 2Z CDs. The difference in the two lay in the extent of multilingual support.
Input of simplified Chinese, traditional Chinese, and Korean were only included with the 2Z CDs. They also came with more languages (the full set of 15 languages), whereas the 1Z CDs came only with about eight languages and in version 10.0.x, could not actually display simplified Chinese, traditional Chinese and Korean (except for the Chinese characters present in Japanese Kanji). A variant of 2Z CDs began when Mac OS X version 10.0.3 was released to the Asian market. However, it could not be upgraded to version 10.0.4 of the operating system. The brief period of multilingual confusion ended with the release of version 10.2. Currently, all Mac OS X installer CDs and preinstallations include the full set of 15 languages and full multilingual compatibility.
Read more about this topic: Mac OS X V10.0