Hi folks, Yes I have managed to compile Hello World on v1/v2. the cp command seems different from all other versions, I'm not sure I understand it so I used the mv command instead which worked as expected. I had to "as crt0.s" and put crt0.o in /usr/lib and then it compiled without issue. Is the kernel in /etc? I saw a core file in /etc that looked like it would be about the right size. No unix file in the root directory which surprised me. At least I know what crt0.s does now. I guess a port of unirubik to v1/v2 is in the cards (maybe). Mark