Differences

This shows you the differences between two versions of the page.

--- systems:4th_edition [2023/06/01 06:22] – Extrapolate significant changes segaloco
+++ systems:4th_edition [2026/04/30 10:06] (current) – segaloco
@@ Line 3: / Line 3: @@
 **Release Date:** November 1973\\
 **Released By:** Bell Labs Research\\
-**Source Code: ** a kernel which predates 4th Edition is [[http://www.tuhs.org/Archive/PDP-11/Distributions/research/Dennis_v3/nsys.tar.gz|nsys.tar.gz]] in the [[http://www.tuhs.org/Archive/PDP-11/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]]\\
-**Documentation: ** [[http://www.tuhs.org/Archive/PDP-11/Distributions/research/Dennis_v4/v4man.tar.gz|4th Edition man pages]], browsable in the [[http://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]]
-The fourth edition of Unix was the first version to have a kernel written in a high level language, C, along with some of the commands. A full and complete copy of Fourth Edition no longer exists. We have:
+The fourth edition of Unix was the first version to have a kernel written in a high level language, C, along with some of the commands. A late snapshot of the Fourth Edition has been recovered [[https://www.tuhs.org/Archive/Distributions/Research/Utah_v4/|here]].  Along with this, we have:
   * The manuals for Fourth Edition in machine-readable format, and
@@ Line 13: / Line 13: @@
 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:
-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.
-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.
 Among the more noticeable changes are:
@@ Line 53: / Line 53: @@
   * The tty driver maps uppercase to lowercase if only uppercase is used
   * The console driver now has greater parity with other tty drivers
-  * In both above cases, ar(I) is *not* updated to support these
   * 2741 terminal support appears to be on the way out
   * A new boot procedure is provided for the C UNIX system
@@ Line 65: / Line 64: @@
   * Section VIII adds ino, mkfs, mknod, sync, update
-For more information about Fourth Edition Unix, see [[http://cm.bell-labs.com/cm/cs/who/dmr/hist.html|The Evolution of the Unix Time-sharing System]] by Dennis Ritchie.
+For more information about Fourth Edition Unix, see [[https://www.nokia.com/bell-labs/about/dennis-m-ritchie/hist.html|The Evolution of the Unix Time-sharing System]] by Dennis Ritchie.