http://betaprograms.autodesk.com/history/autocad_release_history.htm
This unofficial AutoCAD history site is a service to fellow users and trivia aficionados.
This site includes detailed command and system variables that have changed with each release and even some screen shots of old release material.
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Regards,
Shaan Hurley
shaan.hurley@autodesk.com
AutoCAD DWG Version History by Release for the past 20+ years
The first six bytes of a DWG file identify its version. In a DXF file, the AutoCAD version number is specified in the header section. The DXF system variable is $ACADVER.
| AC1021 |
AutoCAD 2007/2008 |
| AC1018 |
AutoCAD 2004/2005/2006 |
| AC1015 |
AutoCAD 2000/2000i/2002 |
| AC1014 |
Release 14 |
| AC1012 |
Release 13 |
| AC1009 |
Release 11/12 |
| AC1006 |
Release 10 |
| AC1004 |
Release 9 |
| AC1003 |
Version 2.60 |
| AC1002 |
Version 2.50 |
| AC1001 |
Version 2.22 |
| AC2.22 |
Version 2.22 |
| AC2.21 |
Version 2.21 |
| AC2.10 |
Version 2.10 |
| AC1.50 |
Version 2.05 |
| AC1.40 |
Version 1.40 |
| AC1.2 |
Version 1.2 |
| MC0.0 |
Version 1.0 |
AutoCAD 2008 can read DWG files back from AutoCAD version 2.0 released in 1984.