I am looking for information on the KIM-4 or other expansions that use to be avilable for the KIM-1 but which might also be adapted to othe similar systems.

I fixed the broken links to this on my website.
This has the theory of operation and a schematic
of the KIM-4 expansion board.

Try http://www.learnmicros.com/kim-4.html

For a much more visually accurate version, there's
the rather big (11 MB!) PDF of the same:
http://www.learnmicros.com/kim-4.pdf
Only do the PDF if you're not dial-up.

Hope this helps.

-- Ross

_________________
The economy isn't "Grapes of Wrath", but it is getting
to be "Raisins of Regret."

-- Ross