Abstract: A multiprocessor having a plurality of processor elements connected in a cascaded manner. A memory is shared between each processor element and a processor adjacent in an upper or lower rank to the processor. In the lower processor element, there are disposed an arbiter for arbitrating a memory access with its upper processor element and a bus selector for switching a bus with the arbiter. The processor elements are connected in a multistage tree structure by a bus connection only. From the upper processor element, therefore, there can be accessed the shared memory in the lower processor element only through an external bus. The whole system is not limited by the address space of each processor and the bus, even if the address space is finite, so that the real memory capacity can be limitlessly expanded in a manner to correspond to the internal memory of each processor element.

Abstract: The present invention is directed to time-sharing computer system which includes a host computer system which operates in response to a host TSS command, a terminal computer system which is connected to the host computer system through a line and operates in response to a terminal TSS command, and a plurality of terminals which are connected to the terminal computer system. In this time-sharing system, the data processing in a terminal computer in response to a terminal TSS command input and the subsequent data processing in the host computer system in response to a host TSS command input can be carried out freely when the terminal is in a state of interaction with the host computer, without carrying out an end command of the host TSS a mode exchange operation. For this purpose, the system adopts the concept of a multiplexed TSS, which enables plural sessions to be simultaneously executed by the host computer system and the terminal computer system.

Abstract: A method of processing a plurality of different code systems for an information processing apparatus including an operating system, comprises a step of inputting a source program, and a compiling step of analyzing meaning of the source program to thereby create a series of instructions and data required for executing a processing equivalent to the meaning of the source program.

Abstract: A computer system comprises a memory for storing communication history information between a terminal and an execution program, and an output message file for storing sets of communication history conditions and output messages corresponding to those conditions. When the terminal issues a message output request, only the output message that meets the communication history condition is selected from the output message file and outputted to the terminal.