How did motherboards develop over the last 20 years?

A motherboard or mainboard is the name of the central printed circuit board (PCB) in personal computers. They hold most of the crucial components for the computer to function and provide connectors for peripherals.

Since their beginnings in the 1970s, motherboards have come a long way. They have shrunken in size and along the way revolutionized the way computers are designed today. The motherboard alone, in these days, is holding millions of transistors. But does anyone know, how the motherboard became, what it is today? Focusing on the ever next new big thing, we tend to be forgetful. Because, there are so many new and exiting technical devices coming out each month, we sometimes forget, where we have been before and the massive amount of work, which went into the development, that led us here.