VMU
5
The Visual Memory Unit (VMU), referred to as the Visual Memory(ビジュアルメモリ) or VM (and VMS) in Japan is the de facto "memory card" for the Sega Dreamcast. While its most basic function is as a removable storage device, the VMU can also serve as an auxiliary display during normal gameplay and, through the use of additional software, it can act as a console independent of the Dreamcast.
The introduction of the VMU was considered quite radical in 1998, for as well as being a means of storing Dreamcast data, it acts as its own independent handheld "console", capitalising on a craze started by Bandai with its Tamagotchi device in late 1996. When plugged into a Dreamcast controller it can act as an extra screen, but if removed it becomes a system with its own D-Pad, A, B Mode and SLEEP buttons.
In order to function on its own, a VMU requires two CR2032 batteries, which can lead to problems. It does not require batteries in order to function within a Dreamcast controller (when the controller is connected and the system is powered on), but if the VMU lacks power it will make a high pitched warning screech during the console's bootup to alert the user.
Two VMUs can be connected together (another idea copied from Bandai, this time in its 1997 Digital Monster range, opening up new possibilities such as transferring data or playing two-player games.
Like the controllers and console, there are many different flavours of VMU in terms of colours. The colours vary depending on the market - in Japan there were many novelty VMUs, often inspired by games. In North America, translucent coloured VMUs were released, while in Europe very few coloured VMUs were sold.
The VMU technically debuted four months before the Dreamcast console, with the release of the Atsumete Godzilla: Kaijuu Dai Shuugou VMU in July 1998. As well as being a self-contained game in itself, it can be treated as a Dreamcast memory card.
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