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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==Technical specifications==
 
This hardware is based closely on the [[Mega Drive|Sega Mega Drive/Genesis]] hardware, with the main [[wikipedia:CPU|CPU]], sound processor and graphics processor being the same, but with the addition of the Altera EPM5032 and Sega 315-5242 color encoder increasing the color palette. The CPU clock speed is slightly faster (8.94 [[wikipedia:Megahertz|MHz]] instead of 7.67 MHz), there is no [[Zilog Z80|Z80]], and the sound chip is driven by the CPU. The [[wikipedia:Digital-to-analog converter|DAC]] is also replaced by the [[NEC]] µPD7759, the same as the [[System 16]] hardware.
 
This hardware is based closely on the [[Mega Drive|Sega Mega Drive/Genesis]] hardware, with the main [[wikipedia:CPU|CPU]], sound processor and graphics processor being the same, but with the addition of the Altera EPM5032 and Sega 315-5242 color encoder increasing the color palette. The CPU clock speed is slightly faster (8.94 [[wikipedia:Megahertz|MHz]] instead of 7.67 MHz), there is no [[Zilog Z80|Z80]], and the sound chip is driven by the CPU. The [[wikipedia:Digital-to-analog converter|DAC]] is also replaced by the [[NEC]] µPD7759, the same as the [[System 16]] hardware.
  
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}}
 
}}
  
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==List of Games==
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==List of games==
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===System C Games===
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===System C games===
 
* ''[[Bloxeed]]'' (1989)
 
* ''[[Bloxeed]]'' (1989)
 
* ''[[Columns]]'' (1990)
 
* ''[[Columns]]'' (1990)
 
* ''[[Columns II]]'' (1990)
 
* ''[[Columns II]]'' (1990)
  
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===System C2 Games===
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===System C2 games===
 
:''Note: there are a number of other ''Print Club'' games omitted from this list because they are undiscovered/undumped/etc.''
 
:''Note: there are a number of other ''Print Club'' games omitted from this list because they are undiscovered/undumped/etc.''
  

Revision as of 20:03, 26 August 2017

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Notavailable.svg
Sega System C
Manufacturer: Sega
Variants: Mega-Tech System, Mega Play, System 18, System 16, Mega Drive
Release Date RRP Code

The Sega System C is an arcade board used by Sega between 1989 and 1994, and later used by Atlus for their Print Club series. A slight update called the Sega System C2 was introduced in 1990. The Columns manual refers to the hardware as 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, but with the addition of the Altera EPM5032 and Sega 315-5242 color encoder 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.

List of games

System C games

System C2 games

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

References

  1. ↑ https://github.com/mamedev/mame/blob/master/src/mame/drivers/segac2.cpp
  2. ↑ Sega 16‑Bit Common Hardware, MAME
  3. ↑ 3.0 3.1 Sega System C2 hardware notes (2003)
  4. ↑ https://github.com/mamedev/mame/tree/master/src/mame/drivers/segac2.cpp


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