The build relies on the Retro-Go firmware for ESP32 devices, which can emulate a range of machines, from the Nintendo NES and Game Boy to the NEC PC Engine, Atari Lynx, and, yes, Doom itself.

An undocumented set of low-level commands has been discovered in the ESP32 microchip, a widely used component in IoT devices.

ESP32, manufactured by a Chinese company called Espressif, is a microcontroller that enables Bluetooth and Wi-Fi connections in numerous smart devices, including smartphones, laptops, smart locks ...