The Nucleus sources (nucleus_plus.tar.gz) and manuals found in this directory
have been downloaded from the following website:

http://forum.androidfan.ru/index.php?showtopic=3384&st=0&p=22630&#entry22630

I (Spacefalcon the Outlaw) have found the above site through a Google search
(I no longer remember what exactly I was searching for - but it must have been
something to do with GSM baseband firmware), and I have no further knowledge
as to the origin of these materials.  I do not personally know XVilka, the
supposed original poster, but I greatly and sincerely thank him (or her?)
for publishing these sources and manuals.  If my memory serves me right, it
was some time in 2011; as of 2016-09 the original site appears to be down.

Addendum: the PowerPC version (nucleus_src_ppc.tar.gz, also from XVilka
according to the Unix uid/gid names inside the tarball) has been found here:

http://www.droid-developers.org/wiki/BP_firmware

The tarball described as "Nucleus PPC 1.12 source" was originally named
Nucleus_src.tar.gz; the accompanying Nucleus_manuals.tar.bz2 was the same as
nucleus_manuals.tar.bz2 we found earlier along with the Nucleus PLUS source
for ARM.

Further addendum: an anonymous contributor sent us the source for Nucleus
version 2013.08, i.e., one of the "modern" versions.  It can be found in the
2013.08 subdirectory.

==========
Commentary
==========

The source contained in nucleus_plus.tar.gz is Nucleus PLUS version 1.14.1 for
ARM.  This source is very valuable because it is a version from approximately
the same timeframe as the versions which TI (Texas Instruments) used for their
Calypso and LoCosto GSM firmwares.  TI's TCS2.1.1 (Calypso) program used a
slightly earlier version, whereas TCS3.2 (LoCosto) used a slightly later
version, thus the version we have fits somewhere in the middle.  Our FreeCalypso
project, which seeks to reconstruct a full-source functional equivalent of
TCS211 by combining source bits from the available TCS211 partial source and
from the almost-full-source LoCosto version, uses this version of Nucleus from
XVilka (which we renamed to FreeNucleus) quite successfully.

It is instructive to contrast this TI-GSM-era version of Nucleus PLUS against
the "modern" version in the 2013.08 subdirectory, i.e., the product which is
currently available from Mentor Graphics - the two are different beyond all
recognition.