> With Protel 99 SE, there are 32 signal layers, 16 power plane layers, and
16
> mechanical layers available, and users "activate" (or "de-activate") these
> as required. I have no personal experience with PCAD 2001, but my
experience
> with PCAD AD2.0, and what I have read about PCAD 2001, shows that layers
can
> be declared, and named, as required, and that each such layer's type can
be
> set as required, i.e. signal, power plane, or other (similar to Protel's
> mechanical layers). And whereas the total number of usable/non-system
layers
> in Protel (99 SE) is 74 (the above 64 layers, plus two Silkscreen, two
> Solder Mask, two Paste Mask, Drill Guide, Keep Outs, Drill Drawing, and
> MultiLayer layers), the corresponding number in PCAD 2001 is 999 (up from
> 255 in PCAD 2000, and other previous versions of PCAD).
>
> Geoff Harland.
Another aspect of previous versions of PCAD, if not also PCAD 2001, is that
layers can be *paired* to one another. As such, an object (within a
component) placed on one of these layers is shifted to its paired layer when
the parent component is moved to the other side of the PCB.
I have suggested that users similarly be able to (optionally) pair
Mechanical layers in Protel. But providing this would have internal database
implications, so it could not be provided in any future SP for Protel 99 SE.
So *if* it ever was to be implemented, it would be in a future major release
version of Protel. (There are reasons to believe that Protel intends to
release another major version before the end of this year, but yet another
SP will still be released for Protel 99 SE at some stage.)
Regards,
Geoff Harland.
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