ArchiCAD 9 has been released in 2004, as the flagship product of Graphisoft, available on both Macintosh and Windows platforms.
The major features themes of ArchiCAD 9 include: ArchiCAD versions
ArchiCAD 9 System Requirements
ArchiCAD 8 version’s OS, CPU, RAM, Video Card, etc. requirements: http://www.graphisoft.com/support/archicad/system_requirements/archicad9.html
Converting ArchiCAD 9 files
From Graphisoft page you can download old ArchiCAD packages which are pre-installed and updated to the latest available build. You can use these packages to convert your old ArchiCAD files to a format which is supported by current ArchiCAD versions: http://www.graphisoft.com/support/archicad/downloads/Fileconverter.html