ARCHICAD 8 has been released in 2002, as the flagship product of Graphisoft, available on both Macintosh and Windows platforms.
The major features themes of ARCHICAD 8 include: ARCHICAD versions
ARCHICAD 8 System Requirements
ARCHICAD 8 version's OS, CPU, RAM, Video Card, etc. requirements: http://www.graphisoft.com/support/archicad/system_requirements/archicad80.html
Converting ARCHICAD 8 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