I have it on good authority that Dazzlemation,
recreated source code here:
http://wsudbrink.dyndns.org:8080/dazzler.html
was initially written on paper and then toggled
in on the front panel of an Altair. Whether
that is entirely true, I'm not sure, but evidence
in the code clearly shows that it was debugged
via the front panel. Also, once the program was
running, its behavior (speed) was controlled
with the front panel switches.
Bill S.