This chip went through at least four revisions, first starting out as a surface mounted chip labeled "MARIO CHIP 1" (Mathematical, Argonaut, Rotation & I/O) in the earliest Star Fox cartridges, commonly called the Super FX. Super Mario World 2: Yoshi's Island uses the Super FX 2 for sprite scaling, rotation, and stretching. In addition to rendering polygons, the chip can assist the SNES with advanced 2D effects. It is typically programmed to act as a graphics accelerator chip that draws polygons to a frame buffer in the RAM sitting adjacent to it. The Super FX chip is a 16-bit supplemental RISC CPU developed by Argonaut Games that was included in certain game cartridges to perform functions that the main CPU cannot feasibly do.
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