I don't have a PDP-7 to try it out on, but here it is: https://computerhistory.org/blog/the-earliest-unix-code-an-anniversary-source-code-release/ and https://archive.computerhistory.org/resources/access/text/2019/09/102785108-05-001-acc.pdf Enjoy! ---------------------- Thomas Dzubin Saskatoon, Calgary, or Vancouver CANADA