Installing RISC OS on the Raspberry Pi 400
![Installing RISC OS on the Raspberry Pi 400](/content/images/size/w2000/2021/12/Screenshot-2021-12-30-204403-b.png)
Let's learn about the origins of ARM and RISC OS at Acorn, download and flash a RISC OS image for the Pi 400 using another ARM device ironically, tangent into BeOS and Haiku, and then explore the unique UI of RISC OS.