a / spending structure for computer systems.

摘要

An information processing system includes internal processing means and peripheral means for conducting information into and out of the system. Input/output (I/O) means are connected from internal bus means to the peripheral means, and includes a control bus means for conducting control words among the peripheral means, each control word including a target identification field containing information identifying a peripheral means connected from the I/O means and a command field containing information identifying a type of I/O operation to be executed. The I/O means further includes an address/data bus means for conducting address/data words among the peripheral means connected from the I/O means. Each communication of an address/data word is accompanied by the communication of a corresponding control word. The execution of an I/O operation involes the transmitting of at least one address/data word, each address/data word including information to be transferred, the information including data or a message or address informating identifying a destination in the address space of the internal processing means of the information to be transferred. With each address/data word, there is transmitted a control word, each control word including a target identification field containing information identifying a peripheral means connected from the I/O means and a command field containing information identifying a type of I/O operation to be executed. An interface controller means is provided to connect each peripheral device to an I/O bus and to direct and control execution of I/O operations.