The connector is based on the venerable PCI connector, chopped up with a Dremel and soldered to a JTAG or ISP programmer. This is simply a card edge connector, something the younglings seem to ...

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 ...