Interesting - what's your source? It was also my understanding they used the -7 'because it was there' but that they had pitched for a PDP-10, which had TOPS-10. - Ian

Sent from my android device. -----Original Message----- From: Doug McIlroy <doug(a)cs.dartmouth.edu> To: tuhs(a)minnie.tuhs.org Sent: Wed, 18 Jun 2014 4:06 AM Subject: Re: [TUHS] Happy birthday, core dumped decided they needed to write a new executive - UNICS - rather than use DECsys. It was the other way around. They had conceived a clean, simple, yet powerful, operating system and needed a machine to build it on. A cast-off PDP-7 happened to be at hand. Doug _______________________________________________ TUHS mailing list TUHS(a)minnie.tuhs.org https://minnie.tuhs.org/mailman/listinfo/tuhs _______________________________________________ TUHS mailing list TUHS(a)minnie.tuhs.org https://minnie.tuhs.org/mailman/listinfo/tuhs