The MonTeX package defines four implementation levels with different degrees of language/script support and different software requirements.

1. Implementation Level I
   • Features: Modern Mongolian in Cyrillic Script and Buryat. MonTeX Implementation Level I understands MLS transliterated Mongolian (good for composing documents on ASCII-only systems) as well as a host of Cyrillic codepages, namely:
     • MLS: The original codepage which supports Cyrillic, Transliterations and Classical Mongolian within one 8-bit codespace.
     • NCC: One popular Cyrillic-only encoding, no umlaut (vowels with diacritic) supported.
     • MOS: Another Cyrillic-only encoding
     • MNK: Another Cyrillic-only encoding
     • DBK: Another Cyrillic-only encoding
     • CTT: Another Cyrillic-only encoding. This one is used by Mongolian applications running under MS-Windows.
     • IBM RUS: This codepage does not contain the additional front vowels needed for Mongolian. It is however occasionally used if nothing else is available.
     • KOI8: Another popular straight Russian-only Cyrillic encoding.
   • Requirements: A working LaTeX2e system
   • Availability: Implementation Level I is contained in implementation level II

2. Implementation Level II
   • Features: Implementation Level I and Mongolian script in LR mode
   • Requirements: A working LaTeX2e system
   • Availability:

3. Implementation Level III
   • Features: Implementation Level II and Mongolian script in horizontal RL mode
   • Requirements: As above, plus functional TeX--XeT system
   • Availability:see below, IL IV.

4. Implementation Level IV
   • Features: Implementation Level III and Mongolian script printed vertically
   • Requirements: like III, plus PostScript support
   • Availability:Implementation Level IV is available as a zipped archive named montex.tgz.

Implementation level I is good for producing documents in Modern Mongolian; implementation level II adds support for words and lines of Classical Mongolian embedded in other (Cyrillic and Latin) scripts which is essentially useful for dictionaries etc.; implementation level III allows the composition of purely Classical Mongolian documents while implementation level IV finally allows the combination of both scripts in freely assignable quantities and locations within the document.

Minor and even major bugs and functional defficiencies should be expected. Please complain loudly if the software behaves in an undesired way.

For a demonstration of MonTeX Level IV capabilities you can download a PostScript Demonstration version showing some of the new commands and their effects on a contemporary text written in Uighur Mongolian, aka bicig.