International Business Machines Corporation

Helmut Schaal

Arnold Blum

Stephan R Richter

Fritz Irro

Hermann Schulze-Schoelling

Lars O Hallberg

Horst Von Der Heyden

Bertil E Norstedt

Karl G Gohl

Victor Gjerstad

Kurt-Inge Andersson

Communication control functions are performed by an integrated adapter implemented as microcode resident in host CPU storage. The integrated adapter shares a common high speed bus with other CPU facilities. A high speed bus adapter provides an interface between the common high speed bus and low speed line adapters. Communication controlling commands and register structures are described.

Communication controller transparently integrated into a host CPU

An instruction execution modification mechanism is described for a digital data processor wherein multiple programs or tasks are performed in a concurrent manner by means of a time slice mechanism which causes the instructions from the different programs to be executed in an interleaved manner. Instructions from the different programs are executed during different successive time slice intervals. The instruction execution modification mechanism is responsive to the occurrences of various predetermined conditions in the data processing system for selectively modifying the normal execution of different ones of the instructions in different ones of the programs. To this end, there is provided a program list mechanism listing the modifiable programs, an instruction list mechanism listing the modifiable instructions and a modification storage mechanism for storing modification signals for the different instructions. If, during a given time slice interval, the program to be executed is on the modifiable program list and the instruction to be executed is on the modifiable instruction list and the appropriate condition is occurring in the data processing system, then the modification storage mechanism is enabled to send the modification signals for this instruction to the instruction execution unit for modifying the normal execution of this instruction.

Instruction execution modification mechanism for time slice controlled

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Dettenhausen, Germany

Helmut Schaal