PlayStation 1 Modchip History & Evolution
The original PlayStation was one of the first consoles to see a widespread modchip scene, fueled by the rise of affordable CD burners and the growing availability of game backups online.
Early modchips appeared as early as 1996, shortly after the console's launch. These initial solutions were expensive and based on the PIC16C54 microcontroller. A major turning point occurred in 1997 with the public release of the "Old Crow" source code. Originally designed for the Zilog Z8, it was quickly ported to PIC chips, reducing costs and allowing for widespread cloning.
Classic Modchip Options
By late 1997, the code was ported to the PIC12C508, a chip still used in many budget modchips today. While all three main legacy options are based on the PIC12C508, there are ports that allow the code to run on other chips like the PIC12F629. These are based on the "Old Crow" code with additional features like support for anti-modchip games.
- MM3 (MultiMode 3): A versatile chip compatible with almost all models. MM3 and Mayumi v4 chips are very similar but operate slightly differently; because of this, some consoles may work better with one than the other.
- Mayumi v4: Considered stable for late-model Fat and early Slim consoles. It uses an external oscillator for timing, making it reliable for region-free playback.
- ONEchip: Specifically engineered for the PAL PSone (SCPH-102). These chips were designed to bypass additional protection inside the SCPH-102 and do not work with anything else.
Asian Market Specialized Circuits (SCPH-xxx3)
In Asian markets (specifically for SCPH-xxx3 models), specialized mass-produced circuits were extremely common. These are often found as "Chip-on-Board" (COB) modules, where the silicon die is mounted directly onto a tiny PCB and covered with a drop of black epoxy (glop-top). While official documentation is non-existent, technical analysis and signal monitoring strongly suggest that the underlying silicon is a cost-reduced, fixed-mask (ASIC) implementation of the PIC12C508 or PIC16C54 architectures. These were factory-produced in massive quantities to meet the high demand for modded consoles in the NTSC-J Asian region.
Modern Solutions: PSNee, Softmods & ODEs
There is also newer code designed to be used with modern Atmel processors like the ATmega and ATtiny series of chips:
- PSNee: A modern alternative based on open-source, portable code. It can be installed on various Atmel (AVR) processors, such as the ATmega328 (Arduino) or the ATtiny x5 series (25/45/85). It is a "stealth" solution that monitors the data stream to inject unlock symbols only when necessary, remaining undetected by most Anti-Modchip routines (v1 and v2). It also includes a complete BIOS patch solution for region-free support.
- Softmods: Tools like FreePSXBoot utilize memory card exploits to run backups and homebrew on stock hardware without soldering.
- ODEs (Optical Disc Emulators): Systems like the xStation or PSIO allow games to be loaded from an SD card. Some of these modern drive replacements utilize logic derived from or inspired by the open-source PSNee project to handle console authentication and region handshakes.