Difference between revisions of "Sega System 18"

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| name=
 
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| maker=[[Sega]]
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| maker=[[Sega Enterprises, Ltd.]]
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| releases={{releases
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| variants=[[System 16]], [[System C]], [[Mega-Tech System]], [[Mega Play]], [[Mega Drive]]
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| arcade_date_world=1989
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| releases={{releasesArcade
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| system_date_world=1989
 
}}
 
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The '''Sega System 18''' is an arcade system board released by [[Sega]] in 1989. The System 18 is primarily a soup-ed System 16, offering superior sound, more tile laters and extra graphics options.
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The '''Sega System 18''' (セガ システム 18) is an arcade system board released by [[Sega]] in 1989. The System 18 is primarily a soup-ed System 16, offering superior sound, more tile layers and extra graphics options.
  
 
System 18 boards had a very short run of games but most adhere to JAMMA standard, unlike previous systems. Most of these games also have the "suicide battery" as associated with Sega's [[System 16]] hardware. It also contains the [[VDP]] used by the [[Sega Mega Drive]] console.
 
System 18 boards had a very short run of games but most adhere to JAMMA standard, unlike previous systems. Most of these games also have the "suicide battery" as associated with Sega's [[System 16]] hardware. It also contains the [[VDP]] used by the [[Sega Mega Drive]] console.
  
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==Technical Specifications==
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==Technical specifications==
 
*Board composition: Main board + [[ROM]] board
 
*Board composition: Main board + [[ROM]] board
 
*Main CPU: [[Motorola 68000]] @ 10 MHz (16-bit & 32-bit instructions @ 1.75 [[wikipedia:Instructions per second|MIPS]])
 
*Main CPU: [[Motorola 68000]] @ 10 MHz (16-bit & 32-bit instructions @ 1.75 [[wikipedia:Instructions per second|MIPS]])
 
*Sound CPU: [[Zilog Z80]] @ 8 MHz (8-bit & 16-bit instructions @ 1.16 MIPS)
 
*Sound CPU: [[Zilog Z80]] @ 8 MHz (8-bit & 16-bit instructions @ 1.16 MIPS)
 
*[[wikipedia:Sound chip|Sound chips]]:
 
*[[wikipedia:Sound chip|Sound chips]]:
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**2× Yamaha YM3438 @ 8 MHz
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:*2× [[Yamaha]] [[YM3438]] @ 8 MHz
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**Ricoh RF5c68 @ 10 MHz (8-channel PCM chip, remarked as Sega Custom 315)
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:*[[Ricoh]] [[RF5c68]] @ 10 MHz (8-channel PCM chip, remarked as Sega Custom 315)
 
*Graphics chips:
 
*Graphics chips:
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**[[Sega System 16B]] chipset
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:*[[Sega System 16B]] chipset
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**Yamaha YM7101 [[VDP]] ([[Sega Mega Drive]] VDP)
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:*[[Yamaha]] [[YM7101]] [[VDP]] ([[Sega Mega Drive]] VDP)
 
*Display resolution: 320×224
 
*Display resolution: 320×224
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*Color palette: 98,304 (16-bit)
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*[[Palette|Color palette]]: 98,304 (16-bit)
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**Sega's 16-bit arcade color palette: 15-bit RGB high color depth (32,768 colors) and 1-bit shadow & highlight that triples up to 98,304 colors.
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:*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
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*Colors on screen: 4096 (unique colors) to 8384 (with shadow & highlight)
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*Colors on screen: 4096 (unique colors) to 8384 (with shadow & highlight){{ref|https://github.com/mamedev/mame/tree/master/src/mame/drivers/segas18.cpp}}
 
*Graphical capabilities: 128 [[sprite]]s on screen at one time, 4 [[Tile Layer|tile layers]], 1 text layer, 1 sprite layer with hardware sprite zooming, translucent shadows, sprites of any height and length, row & column scrolling
 
*Graphical capabilities: 128 [[sprite]]s on screen at one time, 4 [[Tile Layer|tile layers]], 1 text layer, 1 sprite layer with hardware sprite zooming, translucent shadows, sprites of any height and length, row & column scrolling
  
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==Gallery==
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==List of games==
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{{CargoReleaseList
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| table=releases
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| query=console="sys18"
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| orderby=date
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}}
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*''[[Hammer Away]]'' (1991; cancelled)
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*''[[Clockwork Aquario|Tokeijikake no Aquario]]'' (1992; cancelled)
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==Photo gallery==
 
<gallery>
 
<gallery>
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File:System18 mainPCB.jpg|Main PCB
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System18 mainPCB.jpg|Main PCB
 
</gallery>
 
</gallery>
  
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==List of Games==
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==References==
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* ''[[Alien Storm]]''
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<references/>
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* ''[[Bloxeed]]'' (1989 — Japan only; all regions would see it on [[System C]])
 
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* ''[[Clutch Hitter]]''
 
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* ''[[D. D. Crew]]''
 
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* ''[[Desert Breaker]]''
 
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* ''[[Laser Ghost]]''
 
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* ''[[Michael Jackson's Moonwalker]]''
 
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* ''[[Shadow Dancer]]''
 
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* ''[[Where's Wally!]]''
 
  
 
{{Sega Arcade Boards}}
 
{{Sega Arcade Boards}}
 
[[Category:Sega System series]]
 
[[Category:Sega System series]]

Latest revision as of 08:03, 16 November 2024

System18 mainPCB.jpg
Sega System 18
Manufacturer: Sega Enterprises, Ltd.
Variants: System 16, System C, Mega-Tech System, Mega Play, Mega Drive
Release Date RRP Code
Arcade
World		 ? ?




































The Sega System 18 (セガ システム 18) is an arcade system board released by Sega in 1989. The System 18 is primarily a soup-ed System 16, offering superior sound, more tile layers and extra graphics options.

System 18 boards had a very short run of games but most adhere to JAMMA standard, unlike previous systems. Most of these games also have the "suicide battery" as associated with Sega's System 16 hardware. It also contains the VDP used by the Sega Mega Drive console.

Technical specifications

  • Graphics chips:
  • 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: 4096 (unique colors) to 8384 (with shadow & highlight)[1]
  • Graphical capabilities: 128 sprites on screen at one time, 4 tile layers, 1 text layer, 1 sprite layer with hardware sprite zooming, translucent shadows, sprites of any height and length, row & column scrolling

List of games

Photo gallery

  • Main PCB

References

  1. ↑ https://github.com/mamedev/mame/tree/master/src/mame/drivers/segas18.cpp


Sega arcade boards
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