Computer interface between I/O channel unit and service processing unit

An interface system for use in an electronic computer which includes a central processing unit, a main memory unit, an input/output channel unit, and a service processing unit,

• said input/output channel unit having a plurality of channels and a respectively corresponding plurality of channel serial registers, each of said channel serial registers storing status signals, comprising a plurality of stages, and connected via a ring transmitting path;
• said service processing unit including a service serial register, and an operator's console control unit for controlling a console input/output unit, said operator's console control unit having means for controlling said service serial register,
• said interface system further including status signal read/write means for reading or writing status signals by shifting the status signals between said service serial register and said plurality of channel serial registers;
• characterized in that said interface system performs a data transfer operation and further includes:
• a data serial register for storing data information in said input/output channel unit,
• said data serial register comprising a plurality of stages and connected via the ring transmitting path,
• memory data transfer means for transferring data between said data serial register and said main memory unit, and
• service data interface means for connecting said data serial register to said status read/write means so as to enable the transfer of data information between said data serial register and said service serial register so that the read/write means for transferring status between the service serial register and the channel serial register is also used as a path for transferring data information between the service serial register and the data serial register.