It's a long video (with an agenda), but despite the somewhat conspiratorial tone, there's some really interesting stuff in there.

For example, Thomas Peterffy (founder of Interactive Brokers) talking about how they built a robot typist during the 80's to get around NASDAQ rules that required all orders to be entered via the keyboard (14:25).

From another interview [1]:

"Q: What did that thing sound like when it was running?"

"A: Like a machine gun. Brrrrr. Because it was typing so fast."

[1] http://m.npr.org/story/159992076?url=/blogs/money/2012/08/27...