XY point list for spiral to DXF?

Gentlemen,

I tried to make a spiral within Turbocad without success.

So...I plan to write a short basic program to generate an archimedean
spiral with particular dimensions that I want to have waterjet cut out
of sheet metal. Then I will have a list of coordinates. I want to
inport this list to a cadd program to do a little more editing and
which will give me a dxf file ready to cut for the waterjet company.

Does anyone know of a program/way which will allow me to take a simple
list of coordinates and produce a dxf file for input to a cadd
program?

Is there a better way of doing this without buying another expensive
cadd program?

Tom Eldredge