Sega Saturn (Model 1): Difference between revisions
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The '''Sega Saturn''' (Model 1) is a 32-bit fifth-generation home video game console developed by Sega and released in Japan in November 1994, followed by North America and Europe in 1995. Renowned for its complex dual-CPU architecture and advanced 2D/3D graphics capabilities, the Saturn was Sega's answer to the Sony PlayStation and Nintendo 64. | The '''Sega Saturn''' (Model 1) is a 32-bit fifth-generation home video game console developed by Sega and released in Japan in November 1994, followed by North America and Europe in 1995. Renowned for its complex dual-CPU architecture and advanced 2D/3D graphics capabilities, the Saturn was Sega's answer to the Sony PlayStation and Nintendo 64. | ||
== | == Architecture and Processor == | ||
At the heart of the Saturn is a sophisticated multi-processor design: | At the heart of the Saturn is a sophisticated multi-processor design: | ||
* '''Main CPU''': Dual '''Hitachi SH-2''' 32-bit RISC processors, each running at 28.6 MHz, connected via a custom bus. | * '''Main CPU''': Dual '''Hitachi SH-2''' 32-bit RISC processors, each running at 28.6 MHz, connected via a custom bus. | ||
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This parallel architecture enabled advanced graphical effects but presented programming challenges, impacting third-party development. | This parallel architecture enabled advanced graphical effects but presented programming challenges, impacting third-party development. | ||
== | == Memory and Storage == | ||
The Saturn's memory subsystem includes: | The Saturn's memory subsystem includes: | ||
* '''2 MB main RAM''' | * '''2 MB main RAM''' | ||
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'''Storage''' is provided by a double-speed (2×) CD-ROM drive, supporting up to 640 MB per disc. Save data is stored in internal backup RAM or optional external RAM cartridges. | '''Storage''' is provided by a double-speed (2×) CD-ROM drive, supporting up to 640 MB per disc. Save data is stored in internal backup RAM or optional external RAM cartridges. | ||
== | == Display and Graphics == | ||
The Saturn excels at 2D graphics and supports 3D rendering: | The Saturn excels at 2D graphics and supports 3D rendering: | ||
* '''Resolution''': Ranges from 320×224 up to 704×480 pixels (interlaced and non-interlaced modes) | * '''Resolution''': Ranges from 320×224 up to 704×480 pixels (interlaced and non-interlaced modes) | ||
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The Saturn's architecture was optimised for 2D arcade-style games but could deliver impressive 3D visuals when fully utilised. | The Saturn's architecture was optimised for 2D arcade-style games but could deliver impressive 3D visuals when fully utilised. | ||
== | == Sound Capabilities == | ||
Audio on the Saturn is handled by the '''Yamaha YMF292-F (SCSP)''' sound processor: | Audio on the Saturn is handled by the '''Yamaha YMF292-F (SCSP)''' sound processor: | ||
* '''32 sound channels''' (16-bit PCM or 8 FM synthesis) | * '''32 sound channels''' (16-bit PCM or 8 FM synthesis) | ||
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The system's sound hardware enabled rich, multi-layered music and effects, rivaling dedicated audio workstations of the era. | The system's sound hardware enabled rich, multi-layered music and effects, rivaling dedicated audio workstations of the era. | ||
== | == Input/Output and Expansion == | ||
The Saturn provides a range of connectivity and expansion options: | The Saturn provides a range of connectivity and expansion options: | ||
* '''Controller ports''': 2 standard 9-pin Sega controller ports (supporting multitap for up to 6 players) | * '''Controller ports''': 2 standard 9-pin Sega controller ports (supporting multitap for up to 6 players) | ||
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* '''Power supply''': Internal | * '''Power supply''': Internal | ||
== | == PCB Schematics & Service Manual == | ||
<templatestyles src="Template:StyledTable/styles.css" /> | <templatestyles src="Template:StyledTable/styles.css" /> | ||
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The official Sega Saturn Service Manual and schematics are available via [[Sega Service Manual - Sega Saturn Pal - 1 June 1995|Sega Saturn Service Manual (PDF)]]. | The official Sega Saturn Service Manual and schematics are available via [[Sega Service Manual - Sega Saturn Pal - 1 June 1995|Sega Saturn Service Manual (PDF)]]. | ||
== | == Gallery == | ||
<gallery mode="packed" heights="200"> | <gallery mode="packed" heights="200"> | ||
File:Sega-Saturn-Console-Set-Mk1.png|Sega Saturn Model 1 (Japanese launch) | File:Sega-Saturn-Console-Set-Mk1.png|Sega Saturn Model 1 (Japanese launch) | ||
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</gallery> | </gallery> | ||
== | == Related Pages == | ||
* [[Sega Saturn (Model 1) Maintenance Guide|Sega Saturn (Model 1) General Maintenance]] | * [[Sega Saturn (Model 1) Maintenance Guide|Sega Saturn (Model 1) General Maintenance]] | ||
* [[Sega Saturn (Model 1) Troubleshooting Guide]] | * [[Sega Saturn (Model 1) Troubleshooting Guide]] | ||
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[[Category:Sega Systems]] | [[Category:Sega Systems]] | ||
Latest revision as of 18:18, 12 May 2025
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| Sega Saturn Model 1 (Japanese launch version) | |
| Specifications | |
|---|---|
| Manufacturer | Sega |
| Type | Home video game console |
| Released | JP: 22 November 1994 NA: 11 May 1995 EU: 8 July 1995 |
| Discontinued | 1998 (JP), 1998 (NA), 1998 (EU) |
| Intro price | JP: ¥44,800 NA: US$399 EU: £399.99 |
| CPU | Dual Hitachi SH-2 32-bit RISC @ 28.6 MHz |
| Memory | 2 MB RAM, 1.54 MB VRAM, 512 KB sound RAM, 4 MB CD buffer RAM |
| Storage | CD-ROM (2× speed), optional backup RAM cartridge |
| Display | 320×224 to 704×480 pixels, 16.77 million colours (24-bit, 16-bit output) |
| Sound | Yamaha YMF292-F (SCSP): 32 channels, 16-bit PCM, 8 FM channels |
| Dimensions | 260 mm × 230 mm × 83 mm |
| Weight | 2.0 kg |
| OS / Firmware | Proprietary Sega Saturn OS (in ROM) |
| Predecessor | Sega Mega Drive / Genesis (Model 2) |
| Successor | Sega Saturn (Model 2) |
| Codename | "Saturn" |
| Model no. | HST-3200 (JP), MK-80000 (NA/EU) |
The Sega Saturn (Model 1) is a 32-bit fifth-generation home video game console developed by Sega and released in Japan in November 1994, followed by North America and Europe in 1995. Renowned for its complex dual-CPU architecture and advanced 2D/3D graphics capabilities, the Saturn was Sega's answer to the Sony PlayStation and Nintendo 64.
Architecture and Processor
[edit | edit source]At the heart of the Saturn is a sophisticated multi-processor design:
- Main CPU: Dual Hitachi SH-2 32-bit RISC processors, each running at 28.6 MHz, connected via a custom bus.
- Video Display Processors: Two custom VDPs:
- VDP1 – Handles sprites, polygons, and texture mapping for 2D/3D graphics.
- VDP2 – Manages backgrounds, scrolling, and advanced effects.
- Sub-CPUs and Co-processors:
- Hitachi SH-1 (CD-ROM controller)
- Motorola 68EC000 (sound CPU)
- Custom DSPs for geometry and audio processing.
This parallel architecture enabled advanced graphical effects but presented programming challenges, impacting third-party development.
Memory and Storage
[edit | edit source]The Saturn's memory subsystem includes:
- 2 MB main RAM
- 1.54 MB video RAM (VDP1: 512 KB, VDP2: 1 MB)
- 512 KB sound RAM
- 4 MB CD-ROM buffer RAM
- 32 KB backup RAM (internal, battery-backed; expandable via external cartridge)
Storage is provided by a double-speed (2×) CD-ROM drive, supporting up to 640 MB per disc. Save data is stored in internal backup RAM or optional external RAM cartridges.
Display and Graphics
[edit | edit source]The Saturn excels at 2D graphics and supports 3D rendering:
- Resolution: Ranges from 320×224 up to 704×480 pixels (interlaced and non-interlaced modes)
- Colour: Up to 16.77 million colours (24-bit palette), with 16-bit output per pixel
- Sprites: Hardware support for scaling, rotation, and transparency
- Backgrounds: Multiple scrolling backgrounds, line scrolling, and colour effects via VDP2
- 3D Graphics: Flat and texture-mapped polygons, Gouraud shading, and mesh effects
The Saturn's architecture was optimised for 2D arcade-style games but could deliver impressive 3D visuals when fully utilised.
Sound Capabilities
[edit | edit source]Audio on the Saturn is handled by the Yamaha YMF292-F (SCSP) sound processor:
- 32 sound channels (16-bit PCM or 8 FM synthesis)
- 44.1 kHz sampling rate
- DSP effects: reverb, chorus, and modulation
- Sound RAM: 512 KB dedicated
- CD-DA playback and Red Book audio support
The system's sound hardware enabled rich, multi-layered music and effects, rivaling dedicated audio workstations of the era.
Input/Output and Expansion
[edit | edit source]The Saturn provides a range of connectivity and expansion options:
- Controller ports: 2 standard 9-pin Sega controller ports (supporting multitap for up to 6 players)
- AV output: Composite video, S-Video, and RGB SCART (PAL/JP models)
- Stereo audio output
- Backup RAM cartridge slot (for save data expansion)
- Communication connector (for link cable and network peripherals in some regions)
- Cartridge slot (for memory expansion, cheat devices, and region adapters)
- Serial port (for modem and link cable, Japan only)
- Power supply: Internal
PCB Schematics & Service Manual
[edit | edit source]| Saturn Model 1 Mainboard | Mainboard Schematic |
|---|---|
 |
File:Sega saturn va0.5 schematics.pdf |
The official Sega Saturn Service Manual and schematics are available via Sega Saturn Service Manual (PDF).
Gallery
[edit | edit source]-
Sega Saturn Model 1 (Japanese launch) -
Sega Saturn Model 1 controller -
Saturn Model 1 mainboard (top view) -
Saturn CD-ROM Laser assembly -
Official Backup RAM Cartridge
