The ISA is pretty nice, simple, and well documented. And since it's "open", people can create their own implementations. Like this guy, who is creating a RISC-

The ISA is pretty nice, simple, and well documented. And since it's "open", people can create their own implementations. Like this guy, who is creating a RISC-V processor from scratch, without using an FPGA. https://www.youtube.com/playlist?list=PLEeZWGE3PwbZTypHq00G-yEX8TEI95lw4 https://www.youtube.com/playlist?list=PLEeZWGE3PwbZTypHq00G-...