keyboard-device consisting of a  set of keys on apiano or organ or typewriterr or typesetting machine or computer or the like.-holder consisting of an arrangement of hooks on which keys or locks can be hung)

cpu-central processing unit, CPU, C.P.U., central processor, processor, mainframe (

cpu-central process unit the part of a computer that does most of data prcessing; the cpu and the memory form the central part of a computer to which the peripherals are attached.

motherboard-a printed circuit board containing the principal components of a microcomputer or other device, with other circuit boards can be slotted.