The Visual Memory Unit (VMU), also referred to as the Visual Memory System (VMS) in Japan, is the primary memory card produced by Sega for the Dreamcast home video game console. The device features a monochrome liquid crystal display (LCD), multiplayer gaming capability, second screen functionality, a real-time clock, file manager, built-in flash memory, and sound capability. Prior to the launch of the Dreamcast, a special Godzilla edition VMU, preloaded with a virtual pet game, was released on July 30, 1998, in Japan.
https://github.com/wtetzner/waterbear
Assembler/Disassembler for the Dreamcast VMU
