There’s a hardware USB device peripheral in every F103 chip. It has been quite a long journey, but the code is now finally at a stage where it can be used as serial console for Mecrisp Forth.
You will need the Folie utility, version 2.7 or later, a Blue Pill which will be re-flashed, and a way to do so over serial or SWD - such as a second Blue Pill, configured as SerPlus unit:
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