Process flow diagram of two-instance runahead mode in Retroarch. When runahead mode is properly implemented on a Raspberry Pi 4, games control more-or-less as they did on the original hardware.

Main image remixed from Raspberry Pi 4 GPIO pinout diagram by [Les Pounder]. ... MLX90614 and grove GSR sensor through ADS1115 in separate i2c buses in raspberry pi 4.