Printed circuit board manufacture request
=========================================

Name			SBC
Constr. class		?
Shape			Rectangle, middle of the outline that is present in
			all layers
Width                   ??
Height                  ??
Layer file format	Gerber RS 274X
Drill data format	Excellon
Drill data meaning	??
Layers			4-layer, 2x soldermask, 3x silkscreen
Material                ??
Material thickness      ??
Copper thickness        ??
Chirality		All layers are presented as if viewed from component
			side.
Copper polaroty		Positive. Dark places in file mean copper.
Soldermask polarity	Negative. Clear spaces in file mean mask matter.
Silkscreen polarity	Positive. Dark places in file mean paint
Through-plating		??
Gold-plating		??
Surface treatment	??
Edge treatment		??
Testing			??

Note: Gerber RS274 format means "Gerber RS-274X Format", defined in the year
1998 by company Barco Graphics N.V., Gent, Belgium (Barco ETS, Tramstraat 69,
B-9052 Gent, etsinfo@barco.com), see
http://nexp.cs.pdx.edu/twiki-gerber/pub/Gerber/GerberFiles/rs274xrevd_e.pdf

File meaning
============

sbc.pcb.output_back.gbr              solder side - copper
sbc.pcb.output_backmask.gbr          solder side - soldermask
sbc.pcb.output_fab.gbr               drilling checkplan
sbc.pcb.output_front.gbr             component side - copper
sbc.pcb.output_group3.gbr            solder sunderside - copper
sbc.pcb.output_group4.gbr            component underside - copper
sbc.pcb.output_frontmask.gbr         component side - soldermask
sbc.pcb.output_frontsilk.gbr         component side - silkscreen
sbc.pcb.output_backsilk.gbr          solder side - silkscreen
sbc.pcb.output_plated-drill.cnc      drill data - throughplated holes
sbc.pcb.output_unplated-drill.cnc      drill data - unplated holes

Views
-----
Views are in PostScript format and have only informal meaning to check
that the data have been interpreted correctly. They are not intended for
being exposed on a film.

sbc.pcb.output_back.ps               solder side - copper
sbc.pcb.output_backmask.ps           solder side - soldermask
sbc.pcb.output_fab.ps                drilling checkplan
sbc.pcb.output_front.ps              component side - copper
sbc.pcb.output_group3.ps             solder underside - copper
sbc.pcb.output_group4.ps             component underside - copper
sbc.pcb.output_frontmask.ps          component side - soldermask
sbc.pcb.output_frontsilk.ps          component side - silkscreen
sbc.pcb.output_backsilk.ps           solder side - silkscreen