Posted by cantcode on Sep 15, 2013; 11:01am
URL: https://forum.librecad.org/dxf-R12-tp5708763.html

Searching for the way fonts are working in dxf files I found something about the dxf format.
Once claus82 told about some problems regarding other cad software reading files from LCad:
http://forum.librecad.org/dimensions-reading-between-librecad-and-other-softwares-tp5708262.html
At this time I noticed the leading blanks in some lines:http://forum.librecad.org/dimensions-reading-between-librecad-and-other-softwares-tp5708262p5708347.html

And now I found this:
http://www.mediatel.lu/workshop/graphic/3D_fileformat/h_dxf12.html
And it says:
"A DXF file is composed of many groups, each of which occupies two lines in the DXF file. The first line of a group is a group code, which is a positive nonzero integer output in FORTRAN I3 - that is, right-justified and blank filled in a three-character field (the exception to this is the four-digit extended entity data group codes, which are output in FORTRAN I4)."

BUT in the pdf file for AutoCAD® 2002
http://usa.autodesk.com/adsk/servlet/item?id=12272454&linkID=10809853&siteID=123112
I can't find something about FORTRAN.
So does that mean the "FORTRAN I3" format is R12 only?