Raspberry Pi was an attempt to get people (kids especially) thinking about computing at a lower level than the modern windowed OS/smart phone OS. I've done a bi

Raspberry Pi was an attempt to get people (kids especially) thinking about computing at a lower level than the modern windowed OS/smart phone OS. I've done a bit of bare metal programming on it myself which is a good way to get a feel for the ARM processor, without an OS in the way. There's a project here which is a tutorial on building an OS on the RPi from the ground up: https://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/os/ https://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/os/ I have also done a small amount of FPGA work which is more towards the hardware level, bypassing a CPU altogether.