The First Microprocessor

The Intel 4004, the world's first microprocessor. These weren't too popular with hobbyists since, as you can see from this full-sized picture, there wasn't any keyboard. Or mouse. Or screen. Trying to short out the pins to program one of these took weeks, by which time your passion for adding and subtracting -- the microprocessor's two math functions -- had probably died.

Washington Apple Pi IFAQ