It looks like Richard Miller, author of the article and living UNIX legend, is using a verilog implementation by Clifford Wolf [1] in this FPGA board [2]. [1]

It looks like Richard Miller, author of the article and living UNIX legend, is using a verilog implementation by Clifford Wolf [1] in this FPGA board [2]. [1] https://github.com/cliffordwolf/picorv32 https://github.com/cliffordwolf/picorv32 [2] https://www.tindie.com/products/Folknology/blackice-ii/ https://www.tindie.com/products/Folknology/blackice-ii/