Electronic accounting machine with split display

A program controlled electronic accounting machine comprising a processor for controlling the machine functions by executing corresponding program instructions, a keyboard for manually entering data and messages to be processed by said processor, an alphanumeric line display having a maximum capacity of a line of characters and conditionable by said processor for selectively displaying operator guiding messages generated by said processor according to said program, and reply messages entered by said keyboard, each guiding message including a permanent part indicating the current program executed by the machine and a temporary part indicating the data required by the running of the current program, said line display including two different portions, one of which being conditionable to display said permanent part, the other portion being conditionable to display said temporary part of the guiding message, storing means controlled by said processor for normally storing said permanent and said temporary parts, output means conditionable periodically by said processor for connecting said storing means to said display for displaying the information stored in said storing means, and buffer means adapted to receive said reply message entered by said keyboard, said buffer means being controlled by said processor according to a predetermined instruction for transferring said reply message from said buffer means to said storing means as to replace said temporary part of the message, whereby said output means enables said line display to display the reply message alternately with said temporary part of the guiding message in one of said display portions, while the other display portion displays the permanent part of the guiding message for the whole time said program execution lasts.