Versaloon is an open source, USB connected project, that centers around an STM32 processor and provides a standard JTAG pinout. Above you see the Nano version which has a 10-pin JTAG connector ...

If you’re reading Hackaday, you’ve almost certainly heard of JTAG. There’s an excellent ... from how to figure out an unlabeled pinout to determining the instruction length, is explained ...