Since almost all documents I have found on the Internet has copyright
forbidding the distribution of them, I have instead made a list of
information about RS-274[XD]. I found them basically using google.

$Id: sources.txt,v 1.4 2002/02/05 23:20:27 spetm Exp $


Gerber is designed by Gerber Systems, which has been bought by
Barco. Ie Barco (http://www.barco.com/graphics/) has the best
descriptions.

* D-codes, Apertures & Gerber Plot Files
Desribes how a photo plotter works and describes RS-274D.

	 http://www.artwork.com/gerber/appl2.htm


* What's all this about RS274X Anyway?

"If you're a PCB designer you're probably hearing more and more about 
extended Gerber - RS274X. The latest versions of many PCB layout programs 
either offer RS274X as an option or only output RS274X-- such as Cadence's 
Allegro."

Discusses the extension to RS27X from RS274D. Continuation from above.
	  http://www.artwork.com/gerber/274x/rs274x.htm


* BARCO SYSTEMS
_The_ description which is all over Internet. This is the source.
	   http://www.barco.com/ets/data/rs274xc.pdf


* BARCO SYSTEMS
Seems like there is an development, even thought they copyrighted 
the same year
    http://194.7.253.113/ets/products/rs274xrevd_e.pdf


* Barco has a new format.
	http://194.7.253.113/ets/products/DPF_syntax.pdf


* A Free Gerber Viewer in Java
Also has some documentation, which is basically what I listed above.
I haven't looked at the code.
  http://www.wizards.de/phil/java/rs274x.html


* A Free Gerber to TIF converter in C++
Adam Seyschell has made a program called gerb2tif. Seems to handle
more Gerber (aperture macros) than what gerbv currently does. Available at:
     http://home.alphalink.com.au/~seychell/


* A Free Gerber to EPS converter
Dirk Baechle (dl9obn@darc.de) has released a small C++ program to convert 
Gerber to Encapsulated PostScript. Platform independent commandline program.
According to the README in version 1.0 "At the moment only a small subset 
of the RS-274D standard is implemented". Note that it is D! You have to hack
in every aperture, depsite giving it an X file.
       http://sourceforge.net/projects/gerber2eps/


* Eagle Gerber Tutorial
http://www.precma.com/informatica/tutorial.htm


* Excellon Drill Format
http://www.excellon.com/applicationengineering/manuals/program.htm
