1
Kiyosumi Sato, Yoshihiro Mizushima, Katsumi Ohnishi, Motokazu Kato, Toshio Matsumoto: System for directly and indirectly accessing control registers by different operating systems based upon value of operating system indication bit. Fujitsu, Staas & Halsey, May 30, 1989: US04835677 (32 worldwide citation)

A data processing system comprising at least two operating systems (OS1, OS2) for virtual machines, a supervisory operating system, i.e., a control program (CP) for controlling the operating systems, control registers (CR0, CR1, ---) and an extended control register (ECR) having a special bit. When ...


2
Kiyosumi Sato, Kazuyuki Shimizu: Method for recovering from error in a microprogram-controlled unit. Fujitsu, Staas & Halsey, January 21, 1986: US04566103 (13 worldwide citation)

An erroneous microinstruction and related preceding microinstructions are subjected to a so-called retry operation so as to restore the microprogram-controlled unit and correct the error. The retry operation is carried out under an interlock mode, in which both detection and correction occur prior t ...


3
Toshio Matsumoto, Motokazu Kato, Kiyosumi Sato, Yoshihiro Mizushima, Katsumi Ohnishi: Register control processing system. Fujitsu, Staas & Halsey, November 18, 1986: US04623962 (9 worldwide citation)

This invention relates to a register and more specifically to register control in a data processing system. In general, a number of control registers are theoretically required that is less than the maximum number which can be designated, and only the required number of registers are mounted as hard ...


4
Katsumi Ohnishi, Yoshihiro Mizushima, Kiyosumi Sato: Timing control system in data processor. Fujitsu, Staas & Halsey, January 21, 1986: US04566062 (6 worldwide citation)

This invention relates to a timing control, for example, a control for reserving a waiting time when a data processor sends or receives data to or from an external device. Dummy cycles for a number of cycles having a processing time equal to the desired waiting time are generated by a dummy instruct ...


5
Fumirou Matsunoshita, Kiyosumi Sato: Data processing system for preventing machine stoppage due to an error in a copy register. Fujitsu, Staas & Halsey, June 10, 1986: US04594710 (4 worldwide citation)

A data processing system comprising an instruction control unit for controlling system operation, a storage control unit for storing data used for the system operation, and a machine check interruption portion for carrying out a machine check interruption when an error occurs during the system opera ...