Introducing a new RISC-V Mainboard from DeepComputing
https://frame.work/nl/en/blog/introducing-a-new-risc-v-mainboard-from-deepcomputing
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The x86 ISA was invented by Intel, extended on by AMD, and is proprietary, with Intel and AMD being effectively the only two companies able to use and create processors around it.
What makes RISC-V unique is that it is an entirely open architecture, which means that anyone can extend on it and create their own processors that use it without paying a fee.