Digital copier with memory occupancy calculation

Abstract

In a digital copier of the type writing image data read by a scanner in a memory and transferring them from the memory to a printer, a memory change flag indicative of whether or not to calculate the occupancy of the memory is checked. If the flag is set, the occupancy of the memory is calculated and sent to a system controller. One or more reference amounts, which are easy for the user to grasp (e.g. amount corresponding to a single paper of A4 size), can be entered on an operation and display panel. The occupancy of the memory is displayed on the operation and display panel on the basis of each of the reference amounts. The memory change flag is set when image data have been fully written to the memory and when the discharge of a recording medium carrying an image thereon from the copier has been detected (end of read-out). The copier prevents the image data stored in the memory from being destroyed.