The Pres Advanced Quarter Meg (AQM) Cartridge is a large 9cm x 7cm x 1.5cm creme coloured interface, the same size as an Acornsoft ROM cartridge. It connects only to an Acorn Electron computer equipped with an expansion unit (e.g. an Acorn Plus 1, an AP1 or a Rombox+).

The PRES AQM provides a whole 256K of extra sideways RAM. In conjuction with the software it was supplied with, it can be used to load ROM images into each of its separate 16K banks. It can also be configured as a "RAM Disc", allowing instantaneous loading of games from the cartridge.