Quite certainly not on v4 Unix, which apparently had few other sites and would not have been in the running for use as a serious university timesharing system.

Quite certainly not on v4 Unix, which apparently had few other sites and would not have been in the running for use as a serious university timesharing system. However Gates and Allen had already been among the secondary-school students who modified timesharing records to give themselves more time on a PDP-10 system https://web.archive.org/web/20191013171424/http://www.washington.edu/alumni/columns/dec03/allen02.html https://web.archive.org/web/20191013171424/http://www.washin... .