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The motherboard is the bit of PC equipment that can be thought of as the “spine” of the PC. The motherboard serves to interface the entirety of the pieces of a PC together. The CPU, memory, hard drives, and different ports and extension cards all interface with the motherboard legitimately or through links. The IBM Personal Computer that was discharged in 1981, is viewed as the absolute first PC motherboard (it was known as a “planar” at that point)