MAMA was designed to digitize a Schmidt photograph in 2 hours, and a Carte du Ciel plate in 30 minutes, with a positional accuracy of 1 micron. Comparison of recent photographs with Carte du Ciel plates can thus be performed on a large scale to determine proper motions of stars down to visual magnitude 14 over a time interval of about ninety years. The poster presents the main features of the system and illustrates some programmes undertaken in various domains.