Data General Corporation

Charles J Young

Brett L Bachman

Thomas M Jones

Ronald H Gruner

Craig J Mundie

Gerald F Clancy

David L Houseman

James T Nealon

Ward Baxter, Ii

Steven M Haeffele

William N Coder

Stephen R Redfield

Edward J Rasala

A data processing system having a flexible internal structure, protected from and effecitvely invisible to users, with multilevel control and stack mechanisms and capability of performing multiple, concurrent operations, and providing a flexible, simplified interface to users. The system is internally comprised of a plurality of separate, independent processors, each having a separate microinstruction control and at least one separate, independent port to a central communications and memory node. The communications and memory node is an independent processor having separate, independent microinstruction control and comprised of a plurality of independently operating, microinstruction controlled processors capable of performing multiple, concurrent memory and communications operations. Addressing mechanisms allow permanent, unique identification of information and an extremely large address space accessible and common to all such systems. Addresses are independent of system physical configuration. Information is identified to bit granular level and to information type and format. Protection mechanisms provide variable access rights associated with individual bodies of information. User language instructions are transformed into dialect coded, uniform, intermediate level instructions to provide equal facility of execution for all user languages. Operands are referred to by uniform format names which are transformed, by internal mechanisms transparent to users, into addresses.

Digital data processing system

A data processing system having a flexible internal structure, protected from and effectively invisible to users, with multilevel control and stack mechanisms and capability of performing multiple, concurrent operations, and providing a flexible, simplified interface to users. Addressing mechanisms allow permanent, unique identification of information and an extremely large address space accessible and common to all such systems. Addresses are independent of system physical configuration and includes length field information specifying the number of data bits at the addressed location. In accordance with the invention as used in such system, the processor includes arithmetic logic (ALU) means for performing operations on operands. The number of bits in the results of such operations are compared with the number of bits specified by the length field of an address of the location to which the result can be transferred to indicate when such numbers of bits are not equal.

Digital data processing system using unique means for comparing

A data processing system having a flexible internal structure, protected from and effectively invisible to users, with multilevel control and stack mechanisms and capability of performing multiple, concurrent operations, and providing a flexible, simplified interface to users. The system is internally comprised of a plurality of separate, independent processors, each having a separate microinstruction control and at least one separate, independent port to a central communications and memory node. The communications and memory node is an independent processor having separate, independent microinstruction control and comprised of a plurality of independently operating, microinstruction controlled processors capable of performing multiple, concurrent memory and communications operations. Addressing mechanisms allow permanent, unique identification of information and an extremely large address space accessible and common to all such systems. Addresses are independent of system physical configuration. Information is identified to bit granular level and to information type and format. Protection mechanisms provide variable access rights associated with individual bodies of information. User language instructions are transformed into dialect coded, uniform, intermediate level instructions to provide equal facility of execution for all user languages. Operands are referred to by uniform format names which are transformed, by internal mechanisms transparent to users, into addresses.

Digital data processing system using unique formatting techniques for

A digital data multiplier, particularly useful in floating point processing systems, wherein a first digital word representing a first value is multiplied by successive groups of bits of a second digital word representing a second value to form successive partial products which are combined to form successive partial sums, the final sum of all such combined partial sums producing a digital word representing the final product of the first and second values.

Floating point data processing system

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Berlin, MA, United States of America

Charles J Young