Sega OutRun hardware

From Sega Retro

OutrunHardware topboard.jpg
Sega OutRun hardware
Manufacturer: Sega
Release Date RRP Code

Sega's OutRun hardware was released in 1986 with the driving game OutRun. It is a successor to their Hang-On hardware, making it the second in Sega's "Super Scaler" series of pseudo-3D arcade hardware. It was succeeded by the Sega X Board in 1987.

Three games made use of the hardware, all of which are driving games. However, only OutRun and Turbo OutRun are truly for this hardware, as Super Hang-On was also released for the Hang-On hardware in a mostly identical form.

Hardware

The OutRun hardware, like the Hang-On hardware, has specifications similar to those of the System 16, with the addition of a second 68000 processor and a separate video board which allowed for an extra graphics layer for the road as well as sprite/texture scaling capabilities.

The OutRun hardware can do everything the Hang-On hardware can do, but its processors are clocked higher (allowing for quicker calculations) and the video board's capabilities have been expanded, capable of drawing two roads (the Hang-On hardware can only draw one) and rendering sprites/textures using a framebuffer system with a higher fillrate (the Hang-On hardware used a line-buffer system). At the time, the OutRun hardware was a very powerful but expensive arcade board, with arcade operators advised to charge twice as many credits than for regular arcade machines.

Technical Specifications

  • Board composition: CPU Board, Video Board[1]
  • Main CPU: 2× Motorola 68000 @ 12.5 MHz (16-bit & 32-bit instructions @ 4.375 MIPS)
  • Sound CPU: Zilog Z80 @ 4 MHz (8-bit & 16-bit instructions @ 0.58 MIPS)
  • Sound chips:
  • GPU: Sega Super Scaler chipset
    • Graphics board: Sega 837-6064 / 171-5377 VIDEO Board @ 25.1748 MHz (315-5197 Sega Custom Tilemap Generator, 315-5211 Sega Custom Sprite Generator, 315-5242 Sega Custom Color Encoder)
    • Road graphics chips: 315-5155 Sega Road Bit Extraction, 315-5222 Signetics PLS153N Road Mixing
  • Memory: 3534.25 KB to 3758.25 KB
    • RAM: 750.25 KB, including 670 KB high-speed SRAM (Static RAM)[1]
      • Main RAM: 64 KB (32 KB work, 32 KB shared)
      • Video RAM: 684 KB
        • CPU Board: 84 KB (4 KB sprites, 8 KB colors, 64 KB tiles, 4 KB text, 4 KB roads)
        • Video Board: 600 KB SRAM
      • Sound RAM: 2.25 KB
      • SRAM speed: 0-45 nanoseconds[2]
    • ROM: 2784-3008 KB (including 544-640 KB EPROM and 1024 KB Mask ROM)
      • Standard: 2784 KB (672 KB main, 1888 KB video, 224 KB sound)[3][4]
      • Maximum: 3008 KB (672 KB main, 1888 KB video, 448 KB sound)[5][6]
    • Video memory: 2572 KB (684 KB video RAM, 1888 KB video ROM)
  • Video resolution: 320×224 (display), 400×262 (overscan), progressive scan
  • Refresh rate: 60.0543 Hz (V-sync)
  • Color palette: 98,304
    • 16-bit color palette: 15-bit RGB high color depth (32,768 colors) and 1-bit shadow & highlight that triples up to 98,304 colors.
  • Colors on screen: 12,288
  • Graphical planes:
  • Sprite/texture capabilities: Frame-buffered sprites/textures with zooming capabilities, 128 on-screen sprites per frame, 7680 sprites/textures scaled per second, 16 colors per sprite/texture
    • Video clock cycles: 25.1748 MHz (60.0543 Hz refresh rate)
    • Sprite pixel/texel fillrate: 25.1748 million pixels/texels per second, 419,199 pixels/texels per frame/refresh, 1600 sprite pixels/texels per scanline, 128 sprites/textures per scanline

Gallery

  • CPU board (top)

  • CPU board (bottom)

  • Video board (top)

  • Video board (bottom)

List of Games


Sega arcade boards
Originating in arcades









Console-based hardware








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