Tiny RISC-V board that mostly fits inside a USB connector cnx-software.com/2026/08/10/… The Comu board features a 144 MHz @WCH_Tech CH32V203 RISC-V MCU and measures just 13 x 9.4 mm (slightly smaller than a microSD card), while still exposing two white LEDs, four capacitive touch buttons, and six GPIOs. The development board is designed for lightweight bare-metal C/C++ development and is said to work well with the ch32fun project.