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--- systems:2nd_edition [2023/05/20 15:33] – add explanation of s2-bits segaloco
+++ systems:2nd_edition [2023/05/20 16:50] – add revisions between manuals segaloco
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 Another archive, [[https://www.tuhs.org/Archive/Distributions/Research/1972_stuff/s2-bits.tar.gz|s2-bits.tar.gz]], contains what appears to be a dump of the root filesystem of a Second Edition UNIX installation. The contents include binaries of three different formats: those that explicitly call brk upon start, those with a magic number of 405(8), the First Edition a.out(V) format, and those with a magic number of 407(8), the Second Edition a.out(V) format. These format discrepancies may imply the rough linking time of the various objects present.
+Changes include:
+  * Exit/wait now support returning a status
+  * Many system limits are increased (e.g. mounts, buffer sizes)
+  * The hog, kill, sleep, and sync syscalls are added
+  * Added mount command to the INIT tape
+  * Dropped chown, cp, ln, mv, rm, rmdir, stat commands from INIT tape
+  * The init system now uses getty and login
+  * The shell now supports [ ] character class matches, appending with %%>>%%
+  * The shell has expanded programming support with control flow (provided by programs) and error messages
+  * Many commands add diagnostics
+  * The stty command is added to set terminal characteristics
+  * The cp and mv commands no longer operate on pairs
+  * The ds, istat, and salv filesystem tools are added
+  * NROFF is allegedly added or very close, as it is in the manual %%TOC%% but the page is absent
+  * The assembler and linker now support relocation and segmentation
+  * The bc B interpreter replaces the old B system
+  * The cc C compiler is introduced
+  * The m6 macro processor is introduced
+  * The tmg compiler-compiler is introduced
+  * The fc Fortran compiler replaces the old for compiler
+  * The linker now supports the Explor language
+  * Libraries move from /etc to /usr/lib
+  * The floating point simulator is improved
+  * The atan, hypot, and sqrt math functions are added
+  * The salloc string library is added
+  * The qsort algorithm is added
+  * Connectivity to GECOS via the 201 data phone is added
+  * IBM 2741 support is added
+  * Magtape support is added
+  * The motd file is added
+  * Removed the binary punched paper tape format and utilities
+  * Removed many device-specific commands (e.g. dtf, rkf)
+The following papers are mentioned in SEE ALSO sections in the manual:
+  * Users' Reference to B - K. Thompson
+  * C Reference Manual - D.M. Ritchie
+  * M6 Manual - A.D. Hall
+  * ROFF Manual - J.F. Ossanna
+  * The UNIX Time-sharing System - D.M. Ritchie, K. Thompson
 For more information about Second 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.