Mini USB, and USB Type-B connectors. USB-C is faster and capable of both smarter and dramatically higher wattage charging, which is why it's making its way into even non-computer products.

Unfortunately it’s not quite as simple as just soldering on a four-wire USB cable. The modem ... Overall Mini PCI-e is a fairly unloved interface, but we’ve seen the reverse of this hack ...

The interface is about the size of a small notepad and it’s small enough to sling in a bag to take on the road. It comes with a slightly skinny USB cable which ... on my Mac Mini M2 Pro.