Patent US 4,125,892

In a data processing system comprising a plurality of systems each including a plurality of console type typewriters for establishing communications pertaining to data processing operations between an operator and the system, the communication information which is entered into and derived from a central processing unit in each system by the console type typewriter is stored in a character buffer unit corresponding to the console type typewriter in a monitor transfer control unit, and a buffer scanning unit scans the character buffers to transfer the contents therein into a statistical analyzer or processing unit so that communication information may be automatically analyzed and summarized to obtain the data per day or month required for determining whether or not the data processing system has been effectively operated.