gEDA: geda-dev@seul.org

[Peter Cooper <pcc-at-NOSPAMcs_dot_york_dot_ac_dot_uk>]

For my two pece worth in this discussion,

PCAD handles the power pin mapping data by having a '.FIL' file
which is used by the transfer program when going from schematic
to PCB, (I use PCAD 4.5, which is now very old but works OK)

This way parts like a 7404 (and its variants) have a line like this

7404	4	7404.prt	vcc=14,gnd=7	7404.sym

thus you get a mapping for the symbol to part, where the power
pins are, what nets they connect to, and how many symbols map to
the part.

any definitions of the vcc/gnd net on the schematic are mapped in
as well.
Mr P. C. Cooper
Computer Science Dept,
University of York, 
Heslington, York 
YO10 5DD