So, I wonder if I can ask classiccmp members,
especially in
the US, to check if they can view this page:
http://members.iinet.net.au/~daveb/simplex/simplex.html
I have just viewed it (UK, Demon ISP). I've also checked, I can
download at least one of the schematics linked from that page
(I have not checked it makes electronic sense ;-))
-tony