Teensy RTOS PsNee Open source stealth modchip for the Sony Playstation 1 based on freeRTOS running on Teensy 4.0 board. Includes PSOne PAL BIOS Patch Dependencies Teensy 4.0 FreeRTOS Library for Teensyduino Hardware Teensy 4.0 Installation PsNee Installation Guide References PsNee PsNee ESP32