Windows NT Vs Unix As An Operating System

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and Computing Service). The name stuck but the spelling was later
changed to UNIX. Soon Thompson was joined on the project by Dennis Richie and
later by his entire department.

UNIX was moved from the now obsolete PDP-7 to the much more modern PDP-11/20 and
then later to the PDP-11/45 and PDP-11/70. These two latter computers had large
memories as well as memory protection hardware, making it possible to support
multiple users at the same time. Thompson then decided to rewrite UNIX in a
high-level language called B. Unfortunately this attempt was not successful and
Richie designed a successor to B called C. Together, Thompson and Richie rewrote
UNIX in C and subsequently C has dominated system programming ever since. In
1974, Thompson and Richie published a paper about UNIX and this publication
stimulated many universities to ask Bell Labs for a copy of UNIX. As it happened
the PDP-11 was the computer of choice at nearly all university computer science
departments and the operating ...

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Many customers turned to
UNIX to help address those concerns and systems vendors gradually began to offer
commercial UNIX-based systems. UNIX was a portable operating system whose source
could easily be licensed, and it had already established a reputation and a
small but loyal customer base among R&D organisations and universities. Most
vendors licensed source bases from either the University of California at
Berkeley or AT&T(r) (two completely different source bases). Licensees
extensively modified the source and tightly coupled them to their own systems
architectures to produce as many as 100 proprietary UNIX variants. Most of these
systems were (and still are) neither source ...

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