@YauhenYakimovich No, I have not reused any of jslinux code. I have implemented so far all 286 instructions minus paging and segmentation (mmu). My plan was to release the code under GPL, but I would really like to commercialize the idea for running i.e. Freedos or Reactos so I am still unsure about licensing. The truth is, it will take me a LONG time to implement full memory mgmt. and then a long time to get it to run at speed. I will definitely share at github.com/codinguncut. Thanks for your feedback, Johannes