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.DXF
My old DXF generator doesn't work any more.

I have a program that computes a set of points to generate an airfoil in accordance with NACA equations and can print a rib for a model airplane wing on an ordinary printer. It also generates a simple .DXF file that used to work in AutoCAD and other drawing programs, but the current versions of AutoCAD are not backward compatible and the files I generate are no longer readable with AutoCAD 2000 through 2004. The following error message is displayed:

Invalid or incomplete DXF input -- drawing discarded.

I can read my files in AutoCAD 14 and export them in a DXF format that is compatible, but that won't satisfy users' needs. A sample file is attached and simply has the form as shown below (The ellipsis represents the remaining data points with just the first and last included).

What is the minimum I must add to generate files compatible with the new versions of AutoCAD?

0

SECTION

2

ENTITIES

0

LINE

8

0

10

0

20

0

11

0

21

. . .

0

LINE

8

0

10

0.949508007812073

20

-4.85612389832622E-03

11

0.999916185907668

21

-1.25720928962784E-03

0

ZOOMALL

0

ENDSEC

0

EOF