> >Thanks to all for the suggestions.
> >I isn't going to be finished by monay so the immediate problem disappears.
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> GPS and NMEA info: http://vancouver-webpages.com/peter
> Vancouver Power Squadron: http://vancouver.powersquadron.ca
>> The primary (perhaps only) difference between 274D and 274X is that
>> the X version includes the aperture data, while the older D format
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>> It should be a fairly simple matter to write a perl script to merge
>> the aperture data into a gerber file.
>Indeed you are correct in that I have never encountered anywhere that could
>not handle both D & X gerbers.
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>(As we move inexorably toward ODB++ and IDF formats my old 274-D's will
>eventually be obsolete)
Aperture files come in many formats - I expect that originally there
was no need for them to be machine-readable. The original Gerber
photoplotters apparently used something resembling a slide projector
as the print head. An operator would read the customer's aperture
file, and load appropriate "slides" in the slide projector. To avoid
extra costs and delays, the customer had to select apertures that the
plotting company had in stock. (and the plotters could only handle 12
or 24 apertures, if I recall correctly.)
Nowdays, the plotters and associated software can generate any
aperture desired on the fly.
To produce the necessary D->X translation software, you'd have to look
at your aperture files, and at the aperture section of a 274X file,
and determine how to convert one to the other.

Signature
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
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