[turingbirds] found his better solution by looking at some old card edge connectors. Instead of 0.1″ pitch pin headers, weirder and more expensive connectors, the Tag Connect, or even pogo pins ...

Given an unknown PCBA with an ARM processor, odds are good that it will have either the standard 10 pin ... edge connector. A connector for the edge of a PCBA to break out debug signals. Card ...