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Sega Model 1

From Sega Retro

Model1 board.jpg
Fast facts on Sega Model 1
Manufacturer: Sega
Main processor: NEC V60
Release Date RRP Code
Arcade
JP
1992-08 ¥? 837-8886171
Arcade
EU
1992 £6,000 [1] 837-8886171
Arcade
World
1992 837-8886171



The Sega Model 1 is an arcade system board that was released by Sega in 1992. It is the successor to the Sega System 32 (released in 1990), and was succeeded by the Sega Model 2 (released in 1993). While earlier Sega hardware was capable of handling 3D polygons (such as the Mega Drive, released in 1988), the Model 1 was Sega's first hardware specifically designed for 3D polygon graphics.

Originally, the Model 1 was simply known as the CG Board, but was retroactively given the Model 1 name after work on the Model 2 began.

Hardware

It began development in 1990,[2] with Yu Suzuki's Sega AM2 team involved in its development from the drawing board.[3] The Model 1 was intended to compete with Namco's System 21; Namco was then the market leader in polygonal 3D video games, with titles such as Galaxian³ and Starblade.[4] The Model 1 was eventually released in 1992, debuting with Virtua Racing. While it was a significant improvement over the System 21, the Model 1 hardware was expensive, and only a few games were developed for the platform.

Contrary to popular opinion, Lockheed Martin was not involved with the development of the Model 1, but it was developed internally at Sega, before Lockheed Martin became involved with the development of the Sega Model 2, according to former Lockheed Martin employee, Real3D's Jon Lenyo, in 1998. [2]

Technical Specifications

Technical specifications for Sega Model 1 hardware: [5]

  • Board composition: Main Board, Video Board, Memory Board, I/O Board, Communication Board, Sound Board, Motor Board, Audio Mix Board, Amp Board
    • Board revisions: CPU Board 837‑8886171‑6298C (40 MHz), Video PCB 837‑7894 (36 MHz), Memory Board 837‑7893, I/O PCB 837‑8950‑01 (32 MHz), Motor PCB SJ25‑0155‑01 (8 MHz), Communication Board 837‑8842, Sound Board 837‑8679 (20 MHz), Audio Mix PCB 839‑0542, Amp PCB 838‑10018
  • Main CPU: NEC V60 @ 16 MHz [6][7]
  • Additional CPU: 3× Zilog Z80 @ 4 MHz (8‑bit & 16‑bit instructions @ 1.74 MIPS)
    • CPU for I/O Board, Comm Board and Motor Board
  • DMA controllers: Fujitsu MB89237A DMAC, Fujitsu MB89374 Data Link Controller [8][9]

Sound

  • Sound CPU: Toshiba TMP68000N‑10 (68000) @ 12 MHz
  • Sound chips: 2× Sega 315‑5560 Custom MultiPCM
    • Audio capabilities: 28 PCM channels per chip (one for music, one for sound effects), 56 PCM channels total
  • Sound timer: Yamaha YM3834 @ 8 MHz

Graphics

Graphical capabilities of the Sega Model 1: [10]

Memory

  • Memory: Up to 39,166 KB (7008 KB main, 23,646 KB video, 8512 KB audio)
  • System RAM: 2776 KB (1896 KB high‑speed SRAM)
    • Main RAM: 480 KB (at least 156 KB SRAM)
      • Main Board: 324 KB (320 KB main, 4 KB comm)
      • Comm Board: 12 KB SRAM (8 KB SRAM, 4 KB Dual‑Port SRAM) [15][16]
      • Other boards: 144 KB SRAM (128 KB Memory Board, 8 KB I/O Board, 8 KB Motor Board)
    • VRAM: 2232 KB (at least 1464 KB SRAM)
      • Main Board: 768 KB (128 KB display lists, 576 KB tiles, 64 KB color)
      • Video Board: 1464 KB SRAM
    • Audio RAM: 64 KB (16 KB SRAM)
  • Internal DSP cache: 30 KB (6 KB per DSP) [12]
  • System ROM: 1 MB EPROM (768 KB Memory Board, 64 KB I/O Board, 64 KB Motor Board, 128 KB Comm Board)
  • Game ROM: Up to 35,336 KB (5504 KB main EPROM/MROM, 21,384 KB video MROM,[17] 8.25 MB audio MROM)[18]

Bandwidth

  • System RAM bandwidth: 654.224 MB/sec
    • Main RAM: 76 MB/sec
      • V60: 64 MB/sec (32‑bit, 16 MHz) [19]
      • Z80: 12 MB/sec (3× 8‑bit, 4 MHz) [20][21][16]
    • VRAM: 558.223776 MB/sec
      • DSP: 320 MB/sec (5× 32‑bit, 16 MHz) [19]
      • Video Board: 238.223776 MB/sec
        • 315‑5422 & 315‑5292: 30.769232 MB/sec (2× 16‑bit, 7.692308 MHz) [22]
        • 315‑5423: 62 MB/sec (16‑bit, 31 MHz) [19]
        • 315‑5424 & 315‑5425: 145.454544 MB/sec (2× 32‑bit, 18.181818 MHz) [23]
    • Audio RAM: 20 MB/sec (16‑bit, 10 MHz) [20]
  • Internal processor bandwidth: 384 MB/sec
    • V60: 64 MB/sec (32‑bit, 16 MHz)
    • DSP cache: 320 MB/sec (5× 32‑bit, 16 MHz)
  • System ROM bandwidth: 64 MB/sec (32‑bit, 16 MHz) [24]
  • Game ROM bandwidth: 211 MB/sec (3× 32‑bit)
    • EPROM: 64 MB/sec (32‑bit, 16 MHz) [24]
    • MROM: 147 MB/sec (2× 32‑bit, 20 MHz & 16.666667 MHz, 50/60 ns) [25][26]

List of Sega Model 1 games

Gallery

References

  1. File:MeanMachinesSega26UK.pdf, page 18
  2. 2.0 2.1 http://www.thg.ru/smoke/19991022/print.html
  3. http://www.1up.com/features/disappearance-suzuki-part-1
  4. File:MeanMachinesSega19UK.pdf, page 51
  5. https://github.com/mamedev/mame/blob/master/src/mame/drivers/model1.cpp
  6. File:Overview of 32‑bit V‑Series Microprocessor.pdf
  7. File:UPD70616ProgrammersReferenceManual.pdf
  8. File:MB89396 datasheet.pdf
  9. File:MB89374 datasheet.pdf
  10. 10.0 10.1 10.2 https://github.com/mamedev/mame/blob/master/src/mame/video/model1.cpp
  11. http://members.iinet.net.au/~lantra9jp1/gurudumps/m2status/index.html
  12. 12.0 12.1 File:MB86232 datasheet.pdf
  13. http://wiki.mamedev.org/index.php/TGP:Index
  14. http://imame4all.googlecode.com/svn‑history/r146/Reloaded/trunk/src/mame/video/segaic16.c
  15. File:MB8421 datasheet.pdf
  16. 16.0 16.1 File:MB8431 datasheet.pdf
  17. http://mamedb.com/game/vformula
  18. http://mamedb.com/game/vf
  19. 19.0 19.1 19.2 File:M5M5178AP datasheet.pdf
  20. 20.0 20.1 File:MB8464A datasheet.pdf
  21. File:MB8432 datasheet.pdf
  22. File:HM658128A datasheet.pdf
  23. File:HM65256B datasheet.pdf
  24. 24.0 24.1 File:HN27C1024 datasheet.pdf
  25. File:MB8316200B datasheet.pdf
  26. File:MB834000 datasheet.pdf
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VCO Object LaserDisc NAOMI
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