The Cx4 chip (short for Capcom Consumer Custom Chip) was a Hitachi HG51B169 DSP (Digital Signal Processor) operating at 20 MHz . It was a unique piece of hardware that Capcom designed to give their games capabilities the standard SNES couldn't easily manage. The Cx4 famously powered the 3D wireframe models in the game, like the ones used for some bosses and special effects. It was also used for advanced sprite scaling, rotation, and managing the sprite table.
The cx4.bin file is a crucial component for any retro enthusiast looking to play the complete Mega Man X library on original hardware via an . While it may seem complicated, it is a one-time setup that brings the required math coprocessor functionality to your console.
To play Mega Man X2 or Mega Man X3 on non-original hardware, an emulator or FPGA core needs to know exactly how the Cx4 chip processes instructions. While the logic of the chip can be recreated using code, the chip also contains an internal table.
To legally possess cx4.bin , you must dump it from a physical SNES cartridge of Megaman X2 or Megaman X3 using a specialized device like the or a Sanni Cartridge Reader . You would then run a dumping script that extracts the CX4 chip's internal ROM. Unless you are a retro-hardware preservationist, this method is impractical for most users. cx4.bin
simpler, more compatible memory sharing FSM - cosmetic changes, make the GUI a bit more spiffy - only reconfigure FPGA on demand ( Nightfall Crew Super-NT-Jailbreak/README.md at master - GitHub
For years, players using the project sd2snes / FXPak Pro had to manually source and drop cx4.bin alongside other enhancement chips (like dsp1.bin through dsp4.bin ) into the cart's system folder.
: Used to facilitate the FPGA's simulation of the CX4 chip. While newer firmwares (v0.1.7+) for the SD2SNES have the CX4 data embedded in the FPGA configuration , many users still include it for compatibility with older setups or specific firmware variants. The Cx4 chip (short for Capcom Consumer Custom
The file is usually located in /sd2snes/firmware/ or similar, depending on the update package.
The SNES, while powerful for its time, had limitations—particularly in rendering 3D polygons and performing advanced mathematical calculations (like multiplication, division, and trigonometric functions) quickly. To circumvent this, game cartridges often included "enhancement chips" inside the cartridge itself. These chips acted as a secondary processor to take the load off the main SNES CPU.
Because modern flashcarts (like the SD2SNES) rely on FPGA (Field Programmable Gate Array) technology to mimic original hardware, they need a "blueprint" to understand how to act like that original chip. The cx4.bin file is that blueprint. It is loaded into the FPGA, allowing the flashcart to emulate the Cx4's functionality. Which Games Use cx4.bin? It was also used for advanced sprite scaling,
Open your SD card for the SD2SNES/FXPAK Pro. You should see a folder named sd2snes .
SD2Snes Firmware v0.1.7e (Changelog) (1868) - Nightfall Crew
: Historically, users had to source cx4.bin alongside DSP system files ( dsp1.bin , dsp2.bin ) and place them in the root sd2snes directory to play Capcom's titles.
Developed by Capcom, the Cx4 (Capcom-CX4) was a mathematical coprocessor chip added to specific game cartridges to assist the SNES’s main CPU. It was designed to handle complex mathematics—specifically vector geometry and trigonometry—required for 3D wireframe graphics and sprite manipulation.