Dreamcast

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The Sega Dreamcast (Dreamcast) was a sixth generation video game console produced by SEGA, it would become their final console before exiting the hardware industry. The Dreamcast was the successor to the Sega Saturn, which had limited success in sales in both Japan and in the United States. It was released sixteen months before the PlayStation 2 (PS2) and three years before the Nintendo GameCube and the Xbox, and widely hailed as ahead of its time. The Dreamcast was seen as a milestone for pioneering online console gaming.

The Dreamcast was officially discontinued by Sega in 2001, however the console's following is still maintained by occasional game releases from Japan and the homebrew community. By the end of its lifespan, the console sold over 10 million units breaking various sales records set by past consoles.

Technical specifications

Internal view of a Dreamcast console.

The mainboard of the Sega Dreamcast.

Processor

• SH-4 RISC CPU with 32-bit Instruction Set and 128-bit FPU functions (operating frequency: 200 MHz, 360 MIPS, 1.4 GFLOPS)

Graphics Engine

• PowerVR2

• CLX2, 7.0 Mil polygons/second peak performance, supports Trilinear filtering. Actual maximum in game performance (with full textures, lighting, gameplay, etc.) of over 5 Mil polygons/second.
• Tile Based Deferred Rendering eliminates overdraw by only drawing visible fragments. This makes required fillrate almost independent from scene depth complexity, thus making up for a low, compared to other 6th generation consoles, nominal fillrate of 100 MPixels/s as effective fillrate can be triple that amount.
• Graphics hardware effects include gouraud shading, z-buffering, anti-aliasing and bump mapping.

Memory

• Main RAM: 16 MB 64 Bit 100 MHz
• Video RAM: 8 MB 4x16 Bit 100 MHz
• Sound RAM: 2 MB 16 Bit 66 MHz
• VQ Texture Compression (5:1 texture compression)

Sound Engine

• Yamaha AICA Sound Processor: 22.5 MHz 32-Bit ARM7 RISC CPU: 45 MHz, 64 channel PCM/ADPCM sampler (4:1 compression), XG MIDI support, 128 step DSP

Storage

• Yamaha GD-ROM Drive: 12x maximum speed (Constant Angular Velocity)
• GD-ROM: Holds up to 1.2 GB
• Visual Memory Unit ("VMU") 1 Mbit (128 KB) removable storage device and 4x memory cards that hold four times as much data.

Input/Output

• Inputs: USB-like "Maple Bus". Four ports support devices such as digital and analog controllers, steering wheels, joysticks, keyboards, mice, and more.
• Color Output: Approx. 16.78 million colors (24-bit)
• Video resolution: 640x480 interlaced or progressive scan

Dimensions

• 189 mm × 195 mm × 76 mm (7 7/16in × 7 11/16in × 3in)
• Weight: 1.9 kg (4.2 lb)
• Color: Majority are white.

• Japan: Various limited edition designs and colored consoles were produced
• North America: Only a black "Sega Sports"-labeled model and a blue model from Electronics Boutique were officially available
• PAL: No known alternate designs or colors

Networking

A black 56k Dreamcast modem.

• Modem: Removable; speed varied among regions:

• Original Asia/Japan model had a 33.6 kbit/s; consoles sold after September 9, 1999 had a 56 kbit/s modem
• All American models had a 56 kbit/s
• All PAL models had a 33.6 kbit/s

• Broadband: these adapters are available separately and replace the removable modem

• HIT-401 "Broadband Adapter", the more common model, this used a Realtek 8139 chip and supported 10 and 100 Mbit speeds, this device was released in Japan.
• HIT-400: "Broadband Adapter", the more common model, this used a Realtek 8139 chip and supported 10 and 100 Mbit speeds, this device was released in US.
• HIT-300: "Lan Adapter", this version used a Fujitsu MB86967 chip and supported only 10 Mbit speed.

External Links

• Official Dreamcast website
• Official SEGA website