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VM: Visual Memory ([https://segaretro.org/Visual_Memory_Unit#Japan Japan White Box] and [https://segaretro.org/Visual_Memory_Unit#Europe Europe Blue Box]) and VMU: Visual Memory Unit ([https://segaretro.org/Visual_Memory_Unit#US US Black Box]) is a [[Sega Dreamcast emulators|Dreamcast]] accessory that is stowed inside the gamepad, serving the purposes of second screen during gameplay, storage device and, when unplugged, pocket calendar and handheld game console. Its two first functions are implemented in many, if not most, Dreamcast emulators, but its qualities as a rudimentary handheld are left fully for standalone VM emulators, which this article is about. It competed with the [[PocketStation emulators|Sony PocketStation]], a [[PlayStation emulators|PlayStation]] accessory launched one year later. Its 48×32 screen makes it one of the most low-res game consoles of all time, together with the GameKing (also 48×32) and also its competitor (32×32) and the [[Pokémon mini emulators|Pokémon mini]] (96×64). Its games were distributed as bonus features of Dreamcast games: they must be downloaded to the VM when stowed in a controller.