1. Circuit arrangement for operating a computer, having at least one working register into which and out of which information, at specific addresses, can be read, and a readback device for providing feedback in a program step, wherein last-written information is fed back to a processor of the computer, the arrangement comprising at least one feedback register to which said working register is assigned, means for writing said information under the same address into the working register and into the feedback register for storage therein, and means for forwarding the information stored in the feedback register to the processor in order to enable the writing of new information into the feedback register.