Traditionally, the Raspberry Pi has been split into two models: Model A and Model B, with Model A being the ... HAT-compatible 40-pin header, and composite video and reset headers.

But every pin ... Pi Model B from 2012 (PDF) because though more recent models have seen a few changes, this holds the essence of the circuitry. The audio circuitry from the first Raspberry ...

The Raspberry Pi ... possible with the old Model B. You also get Power over Ethernet (PoE) via HAT add-on boards that connect to a new four-pin connector. The Raspberry Pi Foundation is planning ...