Data General Corporation

Harold R Kimmens

James E Veres

Robert W Beauchamp

James Marriot Guyer

David G Therrien

David L Keating

David I Epstein

John J Doyle

James B Stein

Walker Anderson

David W Baird

Michael J Roman

A technique for starting up a data processing system in which a 'basic' or 'kernel' instruction set is stored in an auxiliary store and transferred to the processor's control store in start-up. The kernel instruction set in used to execute an initialization program which identifies an I/O device in which a microcode local program and a desired microcode file are stored. No microcode load program is transferred to the processor's main memory, using the kernel instructions and the desired microcode file is then transferred in selected blocks from the I/O device to the main memory and there to the microcode control store. The microinstructions of the desired microcode file then can be used to load appropriate operating system software so that the overall processor is then ready for use in whatever applications are desirable.

Unique process for loading a microcode control store in a data

A data processing system having separate kernel, vertical and horizontal microcode, separate loading of vertical microcode and a permanently resident kernel microcode, and a soft console with dual levels of capability. The system includes a processor having dual ALC and microcode processors, and an instruction processor. Also included are a processor incorporating a multifunction processor memory, a malfunction nibble shifter, and a high speed look-aside memory control.

Method and apparatus for enhancing the operation of a data processing

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Hudson, MA, United States of America

Harold R Kimmens