For many years now, the so-called ‘Blue Pill’ STM32 MCU development board has ... or the USB port if a suitable bootloader is installed. The schematic for the board is also available, which ...

The YM2151 synthesizer is powered by a STM32 “Blue Pill” board ... [Aidan] has provided the source code, schematics, Bill of Materials, and KiCad-generated Gerber files; everything you ...