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| systems:4th_edition [2026/04/30 10:02] – segaloco | systems:4th_edition [2026/04/30 10:06] (current) – segaloco |
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| **Release Date:** November 1973\\ | **Release Date:** November 1973\\ |
| **Released By:** Bell Labs Research\\ | **Released By:** Bell Labs Research\\ |
| **Source Code: ** a kernel which predates 4th Edition is [[https://www.tuhs.org/Archive/Distributions/Research/Dennis_v3/nsys.tar.gz|nsys.tar.gz]] in the [[https://www.tuhs.org/Archive/Distributions/Research/Dennis_v3/|Unix Archive]]\\ | **Source Code: ** [[https://www.tuhs.org/Archive/Distributions/Research/Utah_v4/unix_v4.tar|unix_v4.tar]] in the [[https://www.tuhs.org/Archive/Distributions/Research/Utah_v4/|Unix Archive]], browsable in the [[https://www.tuhs.org/cgi-bin/utree.pl?file=V4|Unix Tree]]\\ |
| ** the Utah V4 system can be found [[https://www.tuhs.org/cgi-bin/utree.pl?file=V4|here]] | |
| **Documentation: ** [[https://www.tuhs.org/Archive/Distributions/Research/Dennis_v4/v4man.tar.gz|4th Edition man pages]], browsable in the [[https://www.tuhs.org/cgi-bin/utree.pl?file=V4|Unix Tree]] | **Documentation: ** [[https://www.tuhs.org/Archive/Distributions/Research/Dennis_v4/v4man.tar.gz|4th Edition man pages]], browsable in the [[https://www.tuhs.org/cgi-bin/utree.pl?file=V4|Unix Tree]] |
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| The "nsys" kernel was donated by Dennis Ritchie. This is a version of the kernel quite close to that released in Fourth Edition, but without pipes. Dennis Ritchie writes: | The "nsys" kernel was donated by Dennis Ritchie. This is a version of the kernel quite close to that released in Fourth Edition, but without pipes. Dennis Ritchie writes: |
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| This is a tar archive derived from a DECtape labelled "nsys". What is contains is just the kernel source, written in the pre-K&R dialect of C. It is intended only for PDP-11/45, and has setup and memory-handling code that will not work on other models (it's missing things special to the later, smaller models, and the larger physical address space of the still later 11/70.) It appears that it is intended to be loaded into memory at physical address 0, and transferred to at location 0. | [[https://www.tuhs.org/Archive/Distributions/Research/Dennis_v3/nsys.tar.gz|This]] is a tar archive derived from a DECtape labelled "nsys". What is contains is just the kernel source, written in the pre-K&R dialect of C. It is intended only for PDP-11/45, and has setup and memory-handling code that will not work on other models (it's missing things special to the later, smaller models, and the larger physical address space of the still later 11/70.) It appears that it is intended to be loaded into memory at physical address 0, and transferred to at location 0. |
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| The Fourth Edition marks the first edition of research UNIX for which the accompanying manual is produced in NROFF rather than ROFF. Many deprecated/retired pages can be found in the manx folder that still bear ROFF formatting. | The Fourth Edition marks the first edition of research UNIX for which the accompanying manual is produced in NROFF rather than ROFF. Many deprecated/retired pages can be found in the manx directory that still bear ROFF formatting. |
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| Among the more noticeable changes are: | Among the more noticeable changes are: |
