Max ROM size: 4MByte. Max SAVE RAM size: 32KByte. Save States function and In-Game menu function (Due the hardware specifics, in-game menu and save state function does not work with Japanese Mark-III and Genesis/MegaDrive with Power Base Converter). Instant loading. SMS and SG-1000 games are supported. Low power consumption. High quality 4-layers PCB. Soft reset to menu. Micro SD support. OS supports up to 1000 files per folder.