Scratchpad register

A scratchpad register is “a plurality of multibit storage locations, usually located in the central processing unit (CPU) of a computer, used for temporary storage of program information, operands, and calculation results for use by the computer’s arithmetic and logic unit, and other information of a temporary nature.” In re Bradley, 600 F.2d 807, 808 n.1 (C.C.P.A. 1979), aff’d sub nom. Diamond v. Bradley, 450 U.S. 381(1981).