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Sega Dreamcast
Technical specifications

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Sega dreamcast specs and devices

space invaders vmu minigame

Processor Hitachi SH4 Central Processing Unit Hitachi SH4 CPU 200MHz  Processor speed 360 MlPS (million istructions per second) 1,4  billion istructions per second 3D calculations Bus band 800+Mb/s  Processor NEC / Videologic CLX1 PowerVR2DC Graphics Processing Unit:  Processor NEC / Videologic CLX1 (PowerVR second generation)  Rendering poligon peak 3 million and half per second Texture mapping with prospettic correction Punctual Filters Mip-map, bilinears,  trilinears and anisotropic

Gouraud shading, Z-buffer, sources of light in color, Anti-aliasing of the entire scene, 16.7 million colors, texture compression, bump mapping and fog-based hardware acceleration Creating volumetric shadows and light sources Super Sampling, Hidden Surface Removal (HSR), technique by which they were rendered polygons only really visible on the screen. While other console usually apply rendering and effects to the entire scene, thus including parts hidden by other objects on the screen will never be visible, the Dreamcast had the ability to calculate which items were hidden, thus saving hardware resources renderizzandole.

Even the Xbox, the Gamecube and PS2 had small additions of this type, but none of the 128 bits as the Dreamcast Implemented a HSR so evolved.

Thanks to this technique greatly increased the ability to build complex scenes beyond what would be the limit of the console. Memory: 16 MB of main RAM, 8 MB of video RAM (VRAM), 2 MB RAM sound, 128KB Flash RAM Sound: Sound device Yamaha AICA RISC CPU DSP for real-time effects 64 sound channels Full support for 3D sound Audio compression in hardware Multimedia Support: GD-ROM capacity of up to 1 GB Read speed 12X Other 56K (including and upgradable) 4 ports for controllers Expansion Ports Built

chao sonic vmu minigame

VMU Visual Memory Unit

Dreamcast vmu

The VMU is an advanced system for storing saves from Dreamcast  games. Built initially to become a cult object (following Tamagotchi  example) it isn't a simple memory card but a real handheld console.  Is capable in fact of exploiting its memory (128 kb, 200 blocks) to  memorize minigames directly downloaded from internet or unlocked  from games. It's possible to manage saves even without direct  connection with the Dreamcast and it's possible to connect them each other to share data or challenge friends. The VMU can be used  connecting it with the dreampad, showing on screen infos on the  game, images, health bars, equipments, gameplay hours and secret  items depending on the game. Indispensable for some multiplayer games thanks to its unique  features. Yet the memory can be used just for the saves too, 160 default  blocks can be upgraded to 200 thanks to nowadays exploits. Other  useful features are the self turn off to avoid batteries consumption  and custom wallpaper feature.  The box contains the VMU, instruction booklet, 2 batteries ready for  use. Weight 45g.

VMI/VMS are the extensions of files for VMU available from internet 
and downloadable via Dreamcast.

DCI this extension is for the Nexus VMU