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The number of expansion slots in the original IBM PC was a limiting factor for the product, since essential components (such as the video controller, disk controller and printer interface) each came as separate expansion cards and could quickly fill up all five available slots, requiring the user to swap cards in and out as tasks demanded.[4] Some PC clones addressed this problem by integrating components into the motherboard to free up slots,[5] while peripheral manufacturers produced products which integrated multiple functions into one card.[6][7]