> http://search.retrosynth.com/synth-diy/search/lookit.cgi -v0805.169

Dammit! Don't you just hate being thwarted by technology There's
something 'dynamic' I don't understand about that link that
gives 'internal server error' (well it does for me!), but if you then
back arrow out, and forward arrow back in it may work...

Or else go to:

http://search.retrosynth.com/synth-diy/

and search on 'shift register sequence period', it's near the end of
the thread, on 9th May.

Tim