Super FX

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Super FX-rendered 3D polygon graphics in the SNES game Star Fox
Super FX 2 chip on Super Mario World 2: Yoshi's Island
MARIO CHIP 1 (Super FX) chip on Starwing

The Super FX is a family of coprocessor chip added to select Super Nintendo (SNES) video game cartridges, primarily to provide advanced 2D and 3D technique. The Super FX chip was designed by Argonaut Games, who also co-developed (with Nintendo) the 3D space scrolling shooter video game Star Fox to demonstrate the additional polygon rendering capabilities that the chip had introduced to the SNES.

Overview[edit]

While in development, the Super FX chip was codenamed "Super Mario FX"[1] and "MARIO", which is an acronym for "Mathematical, Argonaut, Rotation & Input/Output", where "MARIO" is printed on the face of the final production chip.[2] With the release of Star Fox in 1993, the Super FX became the best selling RISC-based processor at that time.[2]

The chip is used to render 3D polygons and to assist the SNES in rendering advanced 2D effects. This custom-made RISC processor is typically programmed to act like a graphics accelerator chip that draws polygons to a frame buffer in the RAM that sits adjacent to it. The data in this frame buffer is periodically transferred to the main video memory inside of the console using DMA in order to show up on the television display.

For example, Star Fox uses the chip for simple polygon rendering, where the number of polygons is in the hundreds as compared to the millions of more modern, even simple, games. Star Fox uses scaled bitmaps for lasers, asteroids, and other obstacles, but other objects such as ships are rendered with polygons. Super Mario World 2: Yoshi's Island uses the chip for advanced graphics effects like sprite scaling and stretching, for huge sprites that allowed for boss characters to take up the whole screen, and for multiple foreground and background parallax layers to give a greater illusion of depth.

The first version of the chip, commonly referred to as simply "Super FX", is clocked with a 21 MHz signal, but an internal clock speed divider halves it to 10.5 MHz. Later on, the design was revised to become the Super FX GSU-2; this, unlike the first Super FX chip revision, is able to reach 21 MHz.

All versions of the Super FX chip are functionally compatible in terms of their instruction set. The differences arise in how they are packaged, their pinout, and their internal clock speed. As a result of changing the package when creating the GSU-2, more external pins were available and assigned for addressing. As a result, a larger amount of external ROM or RAM can be accessed.

Game cartridges that contain a Super FX chip have additional contacts at the bottom of the cartridge that connect to the extra slots in the cartridge port that are not otherwise typically used. Therefore, Super FX games can not be plugged into cartridge adapters which predate the release of Super FX games. This includes cheat devices, such as the Game Genie.

Because of higher manufacturing costs, fewer Super FX based games have been made, and games that include additional hardware such as the Super FX chips have retailed at a higher MSRP than most SNES games.[3]

List of games[edit]

See also[edit]

References[edit]

  1. ^ "Dylan Cuthbert". Twitter. Archived from the original on May 25, 2014. Retrieved May 25, 2014. "SNES Central @dylancuthbert I'm researching unreleased SNES games, was a game called "Super Mario FX" ever in development? Dylan Cuthbert @snescentral no, that was the internal code name for the FX chip"" 
  2. ^ a b McFerran, Damien (4 July 2013). "Born slippy: the making of Star Fox". Eurogamer. Gamer Network. Retrieved 4 July 2013. 
  3. ^ "Cart Queries". GamePro (59) (IDG). June 1994. p. 12. 
  4. ^ "Dirt Racer". SNES Central. Retrieved July 20, 2014. 
  5. ^ "Dirt Trax FX". SNES Central. Retrieved July 20, 2014. 
  6. ^ "Stunt Race FX". SNES Central. Retrieved July 20, 2014. 
  7. ^ "Vortex". SNES Central. Retrieved July 20, 2014. 
  8. ^ "Doom". SNES Central. Retrieved July 20, 2014. 

External links[edit]