Other connections include PoE on a four-pin header, an ARM debug / UART ... rather than the wider one on the Pi 4. The Raspberry Pi 5 is, in some ways, a modest step forward.

the Raspberry Pi 4 has six SPI controllers, six I2C controllers, and six UARTs – all on its 40-pin header. You can’t make use of all of these at once, but with up to four different connections ...

The Fruit Jam is a single board computer (SBC) that’s about the size of a credit card, or a Raspberry Pi Model B. But while ...