Sega System 24

From Sega Retro

System24.jpg
Sega System 24
Manufacturer: Sega
Release Date RRP Code
Arcade
JP
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Arcade
World
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The Sega System 24 (セガ システム 24) is an arcade platform released by Sega in the late 1980s. The System 24 is quite different from other "System" arcade boards - primarily it handles high resolution games with more colours, rather than serving as a direct successor to the standard Sega System 16 arcade hardware (this task was reserved for the Sega System 32).

Hardware

The System 24 uses two Motorola 68000 processors at 10 MHz. One is for booting, while the other is used by the game. The board holds 1360KB of RAM and 256kB of ROM, and was the first Sega arcade system that required a medium resolution arcade monitor. 4352 colors can be used on-screen from a selectable 32,768, or with shadow and highlight, 16,384 colors on screen selectable from 98,304.[1] The system can support up to 2048 sprites on-screen at once.

Sound is driven by a YM2151 at 4MHz; it is capable of delivering 8 channels of FM sound in addition to a DAC used for sound effects and speech synthesis. Early System 24s loaded their program off of floppy disks. Some later games such as Bonanza Bros. use CD-ROMs or hardware ROM boards as storage. No matter which storage device is used, a special security chip is required for each game an operator wants to play.

Technical specifications

  • Audio output: Stereo speakers, stereo headphones
  • GPU chipset: Sega 315-5242 Color Encoder, 315-5292 Tilemap Generator, 315-5293 Sprite Generator, 315-5294 Priority Mixer, 315-5295 Object Generator[1]
  • Video clock rate: 32 MHz
  • Pixel clock rate: 16 MHz
  • Graphical capabilities: Sprite zoom, scrolling, row & column scrolling, parallax scrolling
  • Internal memory: 1616–1872 KB
  • RAM: 1360–1616 KB
  • Main RAM: 512 KB (256 KB per CPU)
  • Video RAM: 848–1104 KB (16 KB colors, 192 KB tilemaps, 384 KB framebuffer VRAM, 256–512 KB sprite DRAM)
  • Internal ROM: 256 KB
  • Storage media: Floppy disk, ROM board
  • Resolution: 496×384 (display), 656×424 (overscan), progressive scan[2]
  • Refresh rate: 57.52416 Hz
  • Color palette: 98,304 (32,768 colors with shadow & highlight)
  • 16-bit color palette: 15-bit RGB high color depth (32,768 colors) and 1-bit shadow & highlight that triples up to 98,304 colors
  • Colors on screen: 16,384[2] (4352 colors with shadow & highlight)
  • Tilemaps:[3]
  • Tilemap layers: 4 (2 scrolling and 2 windowed)
  • Tile size: 8×8 pixels
  • Tiles per scrolling tilemap: 4096
  • Scrolling tilemap size: 512×512 pixels
  • Colors per tile: 16 to 256
  • Colors per sprite: 16 to 256
  • Sprite size: 8 to 1024 pixels in width/height
  • Sprite virtual space: 4096×4096 pixels
  • Sprites on screen: 2048
  • Framebuffers: Dual framebuffers @ 512×384 pixels each, double buffering[3]
  • Sprite texels per scanline: 1312
  • Sprites per scanline: 164

List of games

Magazine articles

Main article: Sega System 24/Magazine articles.

Promotional material

External links

Rererences

Sega Arcade Boards
Originating in Arcades
76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08
Fonz Galaxian Zaxxon Appoooh X Board Model 2 Hikaru Atomiswave
Blockade G80 Hang-On / Space Harrier Model 1 H1 Model 3 NAOMI 2
VIC Dual System 1 System 24 NAOMI
VCO Object LaserDisc System SP
System 2 System 18
System 16
OutRun System 32
Gigas
Y Board
Based on Consumer Hardware
83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
SG-1000 System E System C Triforce Europa-R RingEdge 2
Mega-Tech System Sega Titan Video Chihiro Nu
Mega Play Lindbergh
RingEdge
RingWide
Hardware Series / Generations
1960s 1970s 1980s 1990s 2000s 2010s
Electro-mechanical systems Sega System series Sega NAOMI series
Discrete logic systems Super Scaler series Post-NAOMI systems
Pre-System boards Sega Model series