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List of SEGA arcade system boards
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List of SEGA arcade system boards
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===SEGA System 18=== The ''SEGA System 18'' is an [[arcade system board]] released by [[SEGA]] in 1989. System 18 had a very short run of games but most boards on this hardware were [[JAMMA]] standard. Most of these games also have the [[#Technical details|"suicide battery"]] as associated with SEGA's [[System 16]] hardware. It also contained the VDP used by the [[SEGA Mega Drive]] console.<ref name=segaic16/> ====System 18 specifications==== * Main [[Central processing unit|CPU]]: [[Motorola 68000]] @ 10 MHz<ref name=s18>{{Cite web|url=http://www.system16.com/hardware.php?id=702|title=System 18 at System 16 - The Arcade Museum}}</ref> (16-bit & 32-bit instructions @ 1.75 MIPS)<ref name=retro/> * Sound CPU: [[Zilog]] [[Zilog Z80|Z80]] @ 8 MHz<ref name=s18/> (8-bit & 16-bit instructions @ 1.16 MIPS)<ref name=retro/> * Sound chip: 2 Γ [[Yamaha Corporation|Yamaha]] [[Yamaha YM2612|YM3438]] @ 8 MHz + [[Ricoh]] [[Ricoh RF5c68|RF5c68]] @ 10 MHz (8-channel [[Pulse-code modulation|PCM]] chip, remarked as SEGA Custom 315) * Graphics chips: SEGA System 16B chipset, Yamaha YM7101 [[Video display controller|VDP]]<ref name=segaic16/> * [[Display resolution]]: 320Γ224 * Color palette: 98,304<ref name=sega16color/> * Colors on screen: 4096 (unique colors)<ref name=s18/> to 8384 (with shadow & highlight)<ref>https://github.com/mamedev/mame/tree/master/src/mame/drivers/segas18.c</ref> * Board composition: Main board + ROM board * Graphical capabilities: 128 sprites on screen at one time, 4 tile layers, 1 text layer, 1 sprite layer with hardware sprite zooming, translucent shadows,<ref name=s18/> sprites of any height and length, [[parallax scrolling|row & column scrolling]]<ref name=s16tech/>
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