As for UARTs, the Raspberry Pi’s one-and-a-half UART interface has long been an issue in robotics and home automation applications.

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.

This case offers several important features for the Raspberry Pi 4, including excellent active and passive cooling, full-sized HDMI ports, and an M.2 SSD socket.

The Rasperry Pi Foundation has released a cooling fan specifically designed as an add-on for their official Raspberry Pi 4 case. I've got one, and I want to see how well it works.