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Sega System C

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Fast facts on Sega System C
Manufacturer: Sega
Variants: Mega-Tech System, Mega Play, System 18, System 16, Mega Drive
Release Date RRP Code
Arcade
World
1989  ?


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
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