Sega Saturn

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Sega Saturn

Sega Saturn, també coneguda com a Saturn, és una consola de 32 bits de la companyia de videojocs Sega, llençada l'any 1994 al Japó, i el 1995 als Estats Units i al continent europeu.

Va aconseguir vendre 170.000 unitats aproximadament el seu primer dia en venda a l'estat japonès. La xifra augmentà fins al mig milió d'unitats durant el nadal del mateix any.

Fou una dura competidora de la Playstation. Malauradament, la consola de Sega no tenia un catàleg suficientment ampli com la seva rival de Sony. A més, la Saturn presentava una arquitectura de programació realment complexa. Va arribar a vendre 10 milions d'unitats.

Actualment, alguns dels seus jocs han esdevingut peces de col·leccionisme molt buscades. Estem parlant dels mítics Radiant Silvergun, Panzer Dragoon Saga, Guardian Heroes, Shining Force III Premium, Dungeon & Dragons, etc.

Característiques tècniques[modifica | modifica el codi]

Processador:

  • 2x 28.6MHz, 50-MIPS SH2 32-bit RISC processors
  • SH1 32-bit RISC processor (controlling the CD-ROM)
  • Custom VDP 1 32-bit video display processor
  • Custom VDP 2 32-bit video display processor
  • Custom Saturn Control Unit (SCU) with DSP for geometry processing and DMA controller
  • Motorola 68EC000 sound processor
  • Yamaha FH1 DSP sound processor, “Sega Custom Sound Processor” (SCSP)
  • Hitachi 4-bit MCU, “System Manager & Peripheral Control” (SMPC)

Memòria:

  • 1MB (8 Megabits) SDRAM
  • 1MB (8 Megabits) DRAM
  • 512K (4 Megabits) VDP1 video RAM
  • 256Kx2 (2×2 Megabits) VDP1 framebuffer RAM
  • 512K (4 Megabits) VDP2 video RAM
  • 4K VDP2 on-chip color RAM
  • 512KB (4 Megabits) audio RAM
  • 512KB (4 Megabits) CD-ROM cache
  • 32KB nonvolatile RAM (battery backup)
  • 512KB (4 Megabits) BIOS ROM

Àudio:

  • 22.6MHz Yamaha FH1 digital signal processor
  • 11.3MHz Motorola 68EC000 sound processor
  • 32 slots for PCM (pulse-code modulation) or FM (frequency modulation) sound
  • Any of 32 slots can be linked together for multiple operators per FM sound channel
  • Usually four operators used per slot for 8 FM channels total
  • 44.1 kHz sampling rate
  • 16-bit stereo DAC

Vídeo processador 1: VDP1 32-bit video display processor

  • Rendering engine for primitives: textured and untextured polygons, untextured polylines and lines
  • “Sprites” are textured polygons with specific rendering modes:
  • Normal sprite (one point), shrinked/scaled sprite (two points), quadrangle (four points)
  • Other rendering modes:
  • Overwrite (replace framebuffer contents)
  • Shadow (underlying framebuffer pixels rewritten with 1/2 brightness, primitive not drawn)
  • Half luminosity (primitive rendered with 1/2 brightness)
  • Half transparency (primitive and underlying framebuffer pixels averaged together)
  • Gouraud shading for RGB-format textures only
  • Dual 256KB frame buffers
  • Programmable frame buffer depth of 8 or 16 bits per pixel
  • Automatic erase feature to clear framebuffer with single color
  • 200,000 texture-mapped polygons per second
  • 500,000 flat-shaded polygons per second
  • 60 frames of animation per second

Vídeo processador 2: VDP2 32-bit background and scroll plane video display processor

  • Background engine
  • Four simultaneous scrolling backgrounds
  • Uses 8×8 or 16×16 tiles or bitmap display per background
  • Programmable memory access controller for VDP2 VRAM
  • Two simultaneous rotating playfields
  • VDP2 can rotate VDP1 framebuffer position while scanning out to display for rotation effects
  • Color RAM supports 15-bit (32768 colors) and 24-bit (16.7 million colors) display modes
  • Programmable priority at the per-background / per-tile / per-pixel levels
  • Background color tinting/fading, and transparency effects
  • Background blur effect (gradation) to simulate distance

Resolució de pantalla: (Only PAL consoles support 256 and 512 scanline displays)

  • Horizontal sizes of 320, 352, 640, 704 pixels
  • Vertical sizes of 224, 240, 256 scanlines, non-interlaced
  • Vertical sizes of 448, 480, 512 scanlines, interlaced
  • Hi-Vision (EDTV) and 31KHz (VGA) display support:
  • 31KHz: 320×480 or 640×480, non-interlaced
  • Hi-Vision: 352×480 or 704×480, non-interlaced

Suport físic:

  • Double-Speed CD-ROM
  • 320KB per second transfer speed
  • Audio CD compatible
  • CD+G compatible
  • CD+EG compatible
  • CD single (8cm CD) compatible
  • Video CD (required optional MPEG add-on) , Photo CD, Electronic Books, digital karaoke (optional)
  • 512KB memory cartridges for game save (optional)

Dispositius d'entrada/sortida:

  • Two 7-bit bidirectional parallel I/O ports
  • High-speed serial communications port (Both SH2 SCI channels and SCSP MIDI)
  • Cartridge connector
  • Internal expansion port for MPEG adapter card
  • Composite video/stereo (standard)
  • NTSC/PAL RF (optional)
  • S-Video compatible (optional)
  • RGB compatible (optional)
  • EDTV compatible (optional)

Alimentació:

  • AC120 volts; 60Hz (US)
  • AC240 volts; 50Hz (EU)
  • AC100 volts; 60Hz (JP)
  • 3 volt lithium battery to power non-volatile RAM and SMPC internal real-time clock

Consum elèctric:

  • 25W

Dimensions:

  • Amplada: 260 mm (10.2 in)
  • Llarg: 230 mm (9.0 in)
  • Altura: 83 mm (3.2 in)

Vegeu també[modifica | modifica el codi]

Enllaços externs[modifica | modifica el codi]

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