The 2.8BSD tapes were the first ones to include a kernel, both source
and a bootable tape. This was an AT&T V7 kernel, with a number of bug
fixes, features in use at Berkeley, performance enhancements that were
circulating to V7 in the licensee community and some build system
changes. It lacks the tell-tale changes that are in 32V, however, at
least according to the extant sources in the TUHS archives.
As such, there's a direct line from V7 unix to 2.8BSD. The V6 lines to
1BSD and 2BSD seem at first to be a little misleading since the tapes
appeared to just include software that ran in V6. However, ashell was
derived from the v6 shell, and ex was an enhanced v6 ed, so I left that
line in place.
In addition, the 2.8BSD tapes incliuded the 4.1BSD job control code and
some userland utilities, so that line is still correct and wasn't