Mark sez, “The recent post of the CARDIAC Unboxing [ed: the CARDIAC
being a cardboard teaching computer that Bell Labs released in the late
60s] made me poke my father, who has written a CARDIAC emulator that
actually looks like the real CARDIAC, to put together a webpage with the
source of it. Both his childhood and mine were definitely influenced by
this little wonder out of Bell Labs, so for those who can’t get the
cardboard variant, here’s the software one, along with a scan of the
original CARDIAC manual.”