Cx4.bin May 2026

The file cx4.bin is a BIOS (firmware) file containing the data for the Hitachi CX4 math coprocessor chip used in Super Nintendo (SNES) cartridges. It is primarily required by hardware emulators and flash cartridges to correctly run specific Capcom games that used this enhancement chip for 3D-like wireframe effects and advanced rotation. Games That Require cx4.bin

Snes9x – ~/.snes9x/firmware/
Higan/bsnes – ~/Emulation/System/snes.firmware/
RetroArch – system/

Example commands:

Search for private keys, certificates, or hard-coded keys.

"Unsupported CX4 revision"

Look for embedded XML/JSON, certificate blobs, or SQLite databases.

1. Abstract

cx4.bin is a firmware dump of the Capcom CX4 custom math coprocessor used in select Super Nintendo Entertainment System (SNES) game cartridges. This file is required by certain software emulators (e.g., Higan, bsnes, Snes9x) to correctly execute 3D wireframe graphics and fixed-point math operations originally handled by the CX4 chip. This paper documents its origin, function, legal status, and proper usage. cx4.bin

A Retrode 2 (USB cartridge reader) or a Sanni Cartridge Reader.
Dumping software (like snes-cx4-dump).
Insert your game, run the dumping tool, and the software will extract the cx4.bin directly from the C4 chip.