Comment by NoNameHaveI

"The problem? I don’t own any RISC-V hardware." Seems like a YOU problem. There is PLENTY of affordable (< 200 USD) RISC-V Orange Pi RV2 boards available for immediate shipment. http://www.orangepi.org/html/hardWare/computerAndMicrocontro... Shoot, if you are testing LOTS of architectures, then get a FPGA dev board and test away. I can't testify about the availability of a IBM 360 open source firmware design, but I know for a fact that Xilinx makes RISC-V available.