$ pdp7 unixv0.simh # Run the PDP-7 Unix kernel on SimH PDP-7 simulator V4.0-0 Beta sim> c # Start execution login: ken password: ken @ date Thu Jan 01 1970 00:00:05 @ ls -l 00004 drw-- 01 777 00050 dd 00035 drwr- 01 012 00060 . 00003 drw-- 01 777 00270 system 00036 lrwr- 01 777 00305 date 00037 lrwr- 01 777 00441 ls @ inum perms lnks uid size file Root was user-id -1, but the octal print routine sees as an unsigned int and prints it truncated to three octal digits, 777. So, the kernel boots and runs. Cheers, Warren