Importance

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Abstract

In a data processing system that includes a central processing unit (CPU) which performs functions on data characters based upon a set of program instructions, the central processing unit being of a type that includes: (a) an arithmetic logic unit for performing the functions on the data characters; (b) a plurality of internal registers for storing data characters; (c) a data bus both for transferring data characters internally within the CPU and for transmitting data characters to and receiving data characters from devices external to the CPU; and (d) an address bus for transmitting receiving addresses of referenced program instructions, and wherein the contents of one of the internal registers forms part of the address of the referenced program instruction available on the address bus. The improvement comprising a storage unit which includes a plurality of data character storage locations which are addressed by the contents of the internal register available on the address bus such that the storage location is written if the referenced instruction is an output and read if the referenced instruction is an input.

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First Claim