The design was revised to the GSU-2, which is still 16-bit, but this version can support a ROM size greater than 8 Mbit. Both the MARIO CHIP 1 and the GSU-1 can support a maximum ROM size of 8 Mbits. The GSU-1 however runs at the full 21.47 MHz. Both versions are clocked with a 21.47 MHz signal, but an internal clock speed divider halves it to 10.74 MHz on the MARIO CHIP 1. From 1994, some boards have an epoxy version, and later a first revision is labeled GSU-1. This chip has at least four revisions, first as a surface mounted chip labeled "MARIO CHIP 1" (Mathematical, Argonaut, Rotation & I/O), commonly called the Super FX, in the earliest Star Fox (1993) cartridges. Super Mario World 2: Yoshi's Island uses the Super FX 2 for sprite scaling, rotation, and stretching. It is typically programmed to act as a graphics accelerator chip that draws polygons and advanced 2D effects 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 Software.
Super FX renders 3D polygons in Star Fox.
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