TTL

Here's the diagram of that XOR design I was talking about. Note also that the two not gates (the single-transistor ones) in the bottom left corner are slightly reversed, as the output lead should be on the top, rather than the bottom, of the gate.
Otherwise, yesterday was work, work, work. Then I fell asleep watching Grizzly Man on the Discovery Channel. Great film if you get the chance to see it.
Well, today's work, work, work again, and then make chili in the evening.