Quotes About PDP-10

The language also owed its existence to the Harvard PDP-10, interestingly enough. Since Gates and Allen didn't have access to an Intel 8080 at the time, they used Gates's student account on the big machine to create a simulation of the microprocessor

Tomlinson had already written an E-mail utility for Tenex, BBN's new time-shared operating system for the PDP-10, and had also begun to experiment with a new version of the Arpanet's file-transfer protocol. So putting the two together seemed a natural step.