International Business Machines Corporation

Herbert Chilinski

Klaus J Getzlaff

Johann Hajdu

Wilhelm Ernst Haller

Arnold Blum

Stephan R Richter

Ralph C Koester

Udo Wille

Fritz Irro

Dietrich W Bock

Dieter Bazlen

Hellmuth R Geng

Siegfried Neuber

Rolf Berger

Franz J Raeth

Processor for character strings of variable length

In the processing of instructions in data processing systems it is not always possible to execute these instructions without interruption since particular situations, in the following called events can occur which necessitate a short interruption for executing the operations caused by such events before continuing the interrupted instruction processing. Such repetition however is only possible when the contents of the operation register containing the instruction is frozen during the interruption. Such a situation requires two actions: the first is the execution of a forced operation to resolve the event. The second action is a repetition of the instruction and execution phase of the interrupted instruction.

Device in the instruction unit of a pipeline processor for instruction

In a microprogram-controlled processor, having an additional operating mode in which particular functions can be executed under direct hardware control, a mode latch signals whether microprogram instructions or directly controlled macro instructions are to be executed. The macroprogram instructions are conventionally executed. For the execution of directly controlled macro instructions, a control storage supplies a hardware control word associated with the macro instruction to be directly executed. The hardware control word contains a mode control bit for signalling that the direct hardware control mode is to be executed. The remainder of the hardware control word contains a plurality of direct control bits, each of which directly controls a hardware function. In an alternative embodiment multiple hardware control words are employed.

Macroinstruction execution in a microprogram-controlled processor

In a micro-controlled data handling system the number of lines and pins required to transfer control signals from the microprogram controls to be integrated circuit modules controlled by such signals is conserved by using two bussing paths for distributing the control signals to the modules. A first path is dedicated exclusively to pre-decoded control signal functions and a second path is shared for transferring both data and control signal functions. Each controlled module contains an additional decoding circuit for combinationally decoding control signal functions received through both paths.

Arrangement for micro instruction control

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Schoenaich, Germany

Herbert Chilinski