Before the microproesso came about, a computer was generally built in a case or mainframe with its components connected using sets of slots. These slots had wires connecting them to other slots.
In the latter part of the 20th century it became more economical to place a number of peripherals onto the motherboard. Motherboards then started to incorporate small chips which were capable of supporting a keyboard, mouse, disk drive and serial/parallel ports.
Over time the motherboard and the chips on it became more powerful. Nowadays most motherboards are designed for IBM compatible computers as they account for around 90% of the world's PC sales.
Current motherboards include sockets, slots into which the system's main memory resides, chipsets, ROM, and the system's firmware or BIOS.
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