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[https://segaretro.org/images/f/f2/VMU_title.png SEGA Visual Memory (program)] [https://segaretro.org/images/d/d5/HKT-7007-18_VM_JP_SGGG_BOX.png VM] is official abbreviation for SGGG 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. It runs on a Sanyo LC8670 8-bit CPU and is equipped with 128 kB of flash memory, of which 28 kB are reserved for the system. The remaining 100 kB are divided into 200 blocks of 512 B. The VMU VM is also equipped with two 6V batteries, used not only to power the system — giving it a few hours of autonomy —, but also to maintain its real-time clock. It has the ability of coupling itself to another VMU VM for multiplayer features and transfer of save data.

It should be of note that, differently from the norm, most VMU VM emulators map the A and B buttons to the A and B keys.

:The first VMU VMS emulator, originally named simply Visual Memory System. Supports a heckton of systems, but after version 1.7, the only port distributed with compiled binaries is Dreamcast. Extant documentation is close to zero. The most up-to-date compiled binary one can find online seems to be the MS-DOS port of version 1.8, wrongly [http://www.emu-france.com/?wpfb_dl=50 archived in Emu-France] under Windows. Sound emulation does not seem to work.