Chapter 6: Input and Output Interfaces¶ Note This chapter is still under construction. UART and Serial Communication¶ RP816-RIA: USB Mass Storage and HID Support¶ ESP32-C3: Wi-Fi, Bluetooth, and USB-UART¶ DE-9 Joystick Ports (Retro Gaming Interface) and GPIO¶ Expansion Port: Full CPU Bus, Audio-In, and I²C¶