<P> Bell developed multiple versions of Unix for internal use, such as CB UNIX (with improved support for databases) and PWB / UNIX, the "Programmer's Workbench", aimed at large groups of programmers . It advertised the latter version, as well as 32V and V7, stating that "more than 800 systems are already in use outside the Bell System" in 1980, and "more than 2000" the following year . Research Unix versions 8, 9, and 10 were developed through the 1980s but were only released to a few universities, though they did generate papers describing the new work . This research led to the development of Plan 9 from Bell Labs, a new portable distributed system . </P> <P> By the early 1980s, thousands of people used Unix at AT&T and elsewhere, and as computer science students moved from universities into companies they wanted to continue to use it . Observers began to see Unix as a potential universal operating system, suitable for all computers . Less than 20,000 lines of code--almost all in C--composed the Unix kernel as of 1983, and more than 75% was not machine - dependent . By that year Unix or a Unix - like system was available for at least 16 different processors and architectures from about 60 vendors; BYTE noted that computer companies "may support other (operating) systems, but a Unix implementation always happens to be available", and that DEC and IBM supported Unix as an alternative to their proprietary operating systems . </P> <P> Microcomputer Unix became commercially available in 1980, when Onyx Systems released its Zilog Z8000 - based C8002 and Microsoft announced its first Unix for 16 - bit microcomputers called Xenix, which the Santa Cruz Operation (SCO) ported to the 8086 processor in 1983 . Other companies began to offer commercial versions of Unix for their own minicomputers and workstations . Many of these new Unix flavors were developed from the System V base under a license from AT&T; others were based on BSD . One of the leading developers of BSD, Bill Joy, went on to co-found Sun Microsystems in 1982 and created SunOS for its workstations . </P> <P> AT&T announced UNIX System III--based on Version 7, and PWB--in 1981 . Licensees could sell binary sublicenses for as little as US $100 (equivalent to $269.18 in 2017), which observers believed indicated that AT&T now viewed Unix as a commercial product . This also included support for the VAX . AT&T continued to issue licenses for older Unix versions . To end the confusion between all its differing internal versions, AT&T combined them into UNIX System V Release 1 . This introduced a few features such as the vi editor and curses from the Berkeley Software Distribution of Unix developed at the University of California, Berkeley Computer Systems Research Group . This also included support for the Western Electric 3B series of machines . AT&T provided support for System III and System V through the Unix Support Group (USG), and these systems were sometimes referred to as USG Unix . </P>

What are the names of the two scientists who worked at at&t bell labs and developed unix in 1969