Difference between revisions of "Sega System C"

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The System C2 adds a NEC µPD7759 ADPCM sample playback chip and a sample ROM which can be banked (as the chip can only access 128kB of samples at a time). This serves as a replacement for using the YM2612's DAC for samples, and has the extra advantage of not needing to constantly provide sample data to the µPD7759 — the 68000 merely sets the sample ROM bank and writes a sample number to play. However, the µPD7759 can only play one sample at a time.
 
The System C2 adds a NEC µPD7759 ADPCM sample playback chip and a sample ROM which can be banked (as the chip can only access 128kB of samples at a time). This serves as a replacement for using the YM2612's DAC for samples, and has the extra advantage of not needing to constantly provide sample data to the µPD7759 — the 68000 merely sets the sample ROM bank and writes a sample number to play. However, the µPD7759 can only play one sample at a time.
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==Technical Specifications==
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This hardware is based closely on the [[Mega Drive|Sega Mega Drive/Genesis]] hardware, with the main [[CPU]], sound processor and graphics processor being the same,{{ref|http://www.system16.com}} but with the addition of the Altera EPM5032{{ref|https://github.com/mamedev/mame/tree/master/src/mame/drivers/segac2.c}} and Sega 315-5242 color encoder{{ref|http://imame4all.googlecode.com/svn-history/r146/Reloaded/trunk/src/mame/video/segaic16.c}} increasing the color palette. The CPU clock speed is slightly faster (8.94 [[MHz]] instead of 7.67 MHz), there is no [[Zilog Z80|Z80]], and the sound chip is driven by the CPU. The [[Digital-to-analog converter|DAC]] is also replaced by the [[NEC]] µPD7759, the same as the [[System 16]] hardware. 17 known games were created for the System C-2 hardware.
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* Board composition: Single [[Japan Amusement Machinery Manufacturers Association|JAMMA]] board{{ref|http://www.system16.com}}
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* Main CPU: [[Motorola 68000|MC68000]] @ 8.948862 MHz{{ref|http://www.system16.com}} (16-bit & 32-bit instructions @ 1.566 MIPS){{ref|http://www.drolez.com/retro/}}
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* Sound chip: [[Yamaha YM2612|YM3438]] @ 7.670453, [[SN76496]] @ 3.579545
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* Optional sound chip: [[NEC]] µPD7759 @ 640 kHz{{ref|http://www.system16.com}} ([[Audio bit depth|9-bit]] [[Adaptive differential pulse-code modulation|ADPCM]] @ 8 kHz [[sampling rate]]){{ref|http://datasheet.eeworld.com.cn/pdf/NEC/71665_UPD7759GC-3BH.pdf}}
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* Graphics chips: Yamaha YM7101 VDP, Altera EPM5032,{{ref|https://github.com/mamedev/mame/tree/master/src/mame/drivers/segac2.c}} Sega 315-5242 color encoder{{ref|http://imame4all.googlecode.com/svn-history/r146/Reloaded/trunk/src/mame/video/segaic16.c}}
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* Video resolution: 320×224 pixels
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* Color palette: 98,304{{ref|http://cgfm2.emuviews.com/txt/c2tech.txt}}
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** Sega's 16-bit arcade color palette: [[List of monochrome and RGB palettes#15-bit RGB|15-bit RGB]] [[high color]] [[Color depth|depth]] (32,768 colors) and 1-bit shadow & highlight that triples up to 98,304 colors.{{ref|http://imame4all.googlecode.com/svn-history/r146/Reloaded/trunk/src/mame/video/segaic16.c}}{{ref|https://web.archive.org/web/20140318183457/http://cgfm2.emuviews.com/txt/s16tech.txt}}{{ref|https://web.archive.org/web/20140318183606/http://cgfm2.emuviews.com/txt/loftech.txt}}
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* Colors on screen: 6144{{ref|https://github.com/mamedev/mame/tree/master/src/mame/drivers/segac2.c}}{{ref|http://cgfm2.emuviews.com/txt/c2tech.txt}}
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* Hardware features: [[Parallax scrolling#Raster method|Line scroll]], column scroll, [[raster interrupt]], 2 background planes (one with an option window), sprite plane, several levels of priority
  
 
==List of System C Games==
 
==List of System C Games==

Revision as of 20:11, 20 February 2015

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The Sega System C is an arcade board used by Sega between 1989 and 1994 (though it was later used by Atlus for their Print Club series). A slight update called the Sega System C2 was introduced in 1990. The Columns manual claims the hardware was called Sega System 14.

Hardware

The System C hardware is built on top of the Sega Mega Drive with a few differences that make them incompatible:

  • The 68000 is clocked at ~9Mhz. The Z80 was removed; the faster 68000 allows it to handle sound without slowdown in games.
  • The VDP no longer uses its internal CRAM for palettes. Instead, it relies on external hardware to provide color information. The hardware is capable of producing 4096 possible colors which can be fed to the VDP in a variety of ways.

The System C2 adds a NEC µPD7759 ADPCM sample playback chip and a sample ROM which can be banked (as the chip can only access 128kB of samples at a time). This serves as a replacement for using the YM2612's DAC for samples, and has the extra advantage of not needing to constantly provide sample data to the µPD7759 — the 68000 merely sets the sample ROM bank and writes a sample number to play. However, the µPD7759 can only play one sample at a time.

Technical Specifications

This hardware is based closely on the Sega Mega Drive/Genesis hardware, with the main CPU, sound processor and graphics processor being the same,[1] but with the addition of the Altera EPM5032[2] and Sega 315-5242 color encoder[3] increasing the color palette. The CPU clock speed is slightly faster (8.94 MHz instead of 7.67 MHz), there is no Z80, and the sound chip is driven by the CPU. The DAC is also replaced by the NEC µPD7759, the same as the System 16 hardware. 17 known games were created for the System C-2 hardware.

  • Board composition: Single JAMMA board[1]
  • Main CPU: MC68000 @ 8.948862 MHz[1] (16-bit & 32-bit instructions @ 1.566 MIPS)[4]
  • Sound chip: YM3438 @ 7.670453, SN76496 @ 3.579545
  • Optional sound chip: NEC µPD7759 @ 640 kHz[1] (9-bit ADPCM @ 8 kHz sampling rate)[5]
  • Graphics chips: Yamaha YM7101 VDP, Altera EPM5032,[2] Sega 315-5242 color encoder[3]
  • Video resolution: 320×224 pixels
  • Color palette: 98,304[6]
  • Colors on screen: 6144[2][6]
  • Hardware features: Line scroll, column scroll, raster interrupt, 2 background planes (one with an option window), sprite plane, several levels of priority

List of System C Games

List of System C2 Games

Note: there are a number of other Print Club games omitted from this list because they are undiscovered/undumped/etc.


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