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One advantage of using Xfig for schematics, is that the color and shape of the busses can be defined exactly the way you like. Here is a design that illistruates this:
Here is the FIG file.
Another interesting feature of using a more general purpose drawing program, is that you can combine component details and an overall schematic if you wish, as this drawing shows.
For more about this project, see this page.
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