Editing Sega Saturn (Model 1)

{{Infobox computer
| name         = Sega Saturn (Model 1)
| image        = [[File:Sega-Saturn-Console-Set-Mk1.png|250px]]
| caption      = Sega Saturn Model 1 (Japanese launch version)
| manufacturer = Sega
| type         = Home video game console
| release date = JP: 22 November 1994<br>NA: 11 May 1995<br>EU: 8 July 1995
| discontinued = 1998 (JP), 1998 (NA), 1998 (EU)
| price        = JP: ¥44,800<br>NA: US$399<br>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           = Proprietary Sega Saturn OS (in ROM)
| predecessor  = [[Sega Mega Drive / Genesis (Model 2)]]
| successor    = [[Sega Saturn (Model 2)]]
| codename     = "Saturn"
| model        = HST-3200 (JP), MK-80000 (NA/EU)
| logo         = [[File:SEGA Saturn logo.png|250px]]
}}

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:
* '''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 ==
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 ==
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 ==
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 ==
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 ==
<templatestyles src="Template:StyledTable/styles.css" />

{| class="wikitable styled-table" style="width:80%; text-align:center;"
! Saturn Model 1 Mainboard
! Mainboard Schematic
|-
| [[File:Sega-Saturn-Motherboard.jpg|thumb|center|300px|Sega Saturn Model 1 Mainboard]]
| [[File:Sega saturn va0.5 schematics.pdf|center|thumb|Sega Saturn Model 1 Mainboard Schematic]]
|}

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">
File:Sega-Saturn-Console-Set-Mk1.png|Sega Saturn Model 1 (Japanese launch)
File:Sega-Saturn-Controller-Mk-I-NA-FL.jpg|Sega Saturn Model 1 controller
File:Sega-Saturn-Motherboard.jpg|Saturn Model 1 mainboard (top view)
File:Sega-Saturn-Laser-Assembly-V1-a.jpg|Saturn CD-ROM Laser assembly
File:Sega-Saturn-Backup.jpg|Official Backup RAM Cartridge
</gallery>

== Related Pages ==
* [[Sega Saturn (Model 1) Maintenance Guide|Sega Saturn (Model 1) General Maintenance]]
* [[Sega Saturn (Model 1) Troubleshooting Guide]]
* [[Sega Saturn Controller Repair Guide]]
* [[Sega Saturn (Model 1) Capacitor Replacement Guide]]

[[Category:Sega Systems]]