it exposes an Arm serial wire debug port, which is and isn't a JTAG port. Specifically, it's a different layer 1 interface, using a 2-wire serial port instead, but it uses the JTAG protocol on top.
I'm familiar with SWD from a UX standpoint- I write firmware, so I use it a lot. "Just cram the wires into the J-Link a little differently" is about as much research I've ever had to do to use SWD. I never really dug into the technical differences. Thanks for the explanation!
