Information processing system with control methods and apparatus for information storage and interrupt request handling scheme

An information processing system including an operational processing system having a plurality of registers for executing an operational processing, and a storage system connected to the operational processing system for storing information stored in the registers, the storage system comprising:

• interruption processing detector means for detecting whether an execution of interruption processing is requested in the operational processing system;
• memory means having an information storing region organized in a stack structure, for storing the information stored in the registers into the information storing region;
• input means for inputting the information stored in the registers into the information storing region of the memory means;
• address data storing means for storing address data for a stored information region within the information storing region, wherein the stored information region stores the information from the registers and the address data includes an address of the register most recently stored into the information storing region;
• and
• control means for controlling the input means to control inputting the information stored in the registers into the information storing region of the memory means according to the address data for the stored information region within the information storing region, and to suspend inputting the information stored in the registers into the information storing region prior to the completion of the storage of the information stored in all of the plurality of registers into the information storing region, when a request for the execution of interruption processing is detected by the interruption processing detector means.