HFT Review posted this interview with John Lowery, who it seems was there right at the start of electronic trading.
we were probably the first ever firm to offer co-location, high speed market data and a high speed transport system. I remember it was a great day when we first broke the one second barrier for an execution, we did 900 milliseconds and thought that was amazing! We were certainly way faster than anybody else on the street at that point; most firms were taking 10-15 seconds.