There are three different versions of the Raspberry Pi 4 out on the market right now: the “normal” Pi 4 Model B, the Compute Module 4, and the just-released Raspberry Pi 400 computer-in-a-keyboard.

Looking at the hardware, the Raspberry Pi 400 is effectively an optimized Raspberry Pi 4 Model B built into a keyboard. Students and tinkerers get a PC with a small footprint, a low price, and great ...