UNIX Third Edition - Revision history

Jnc: Mention archaeology without kernel source

2023-10-20T01:58:51Z

Mention archaeology without kernel source

Jnc: /* External links */ +TUHS wiki link

2023-10-18T18:52:46Z

‎External links: +TUHS wiki link

Jnc: Add my archaeology

2023-10-18T17:40:19Z

Add my archaeology

Jnc: V3 had simpler mem mgmt than V4

2023-05-18T05:11:42Z

V3 had simpler mem mgmt than V4

Jnc: forgot

2022-06-23T04:16:58Z

forgot

Jnc: +previous version

2022-06-23T04:16:23Z

+previous version

Jnc: +Next Version

2022-05-25T09:14:25Z

+Next Version

Jnc: Same FS as V2

2022-05-25T00:49:18Z

Same FS as V2

Aap: added link to manual

2022-05-24T21:42:27Z

added link to manual

Jnc: A start - at least there's a date, and key changes

2022-05-24T20:47:09Z

A start - at least there's a date, and key changes

New page

{{Infobox OS
| name = Unix V3
| creator = AT&T/[[Western Electric]]
| year introduced = February, 1973
| type = [[Multi-tasking]], [[multi-user]]
| architecture = [[PDP-11 architecture|PDP-11]]
}}

'''UNIX Third Edition''' (often referred to as '''UNIX V3''' or '''V3 UNIX''' - 'Unix' was still normally given in all capital letters at this point in time) was a significant early version of [[UNIX]]. It was the version in which [[pipe]]s appeared, and the last version in which the [[kernel]] was written in [[assembly language]].

It still ran on the [[PDP-11/20]] model of the PDP-11, as well as the [[PDP-11/45]] (apparently). The [[file system]] is almost identical to the [[UNIX file system|V6 one]]; the only major differences are that i) the free blocks are stored as a bit [[array]], rather than a [[list]], and ii) [[peripheral|device]] 'special files' are indicated by [[inode]] numbers below 41. (not via a flag in the 'mode' word in the inode, as later).

A complete copy of Third Edition does not seem to be extant. [[The Unix Heritage Society|TUHS]] has a copy of the 'UNIX Programmer's Manual Third Edition', and the [[source code]] for an early version of the first [[C programming language|C]] [[compiler]] (C was just being defined at the point in time, although it first appeared in [[UNIX Second Edition]]).

==External links==

* [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3 V3]
** [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3/man/man0/intro UNIX Programmer's Manual Third Edition - Introduction]
*** [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3/man/man5/fs.5 File system]
*** [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3/man/manx/obproc.7 Boot procedures] - possibly obsolete?

{{Nav Unix}}

[[Category: PDP-11 Operating Systems]]
[[Category: Non-DEC Operating Systems]]
[[Category: Unix OS's]]

@@ Line 10: / Line 10: @@
 }}
-'''UNIX Third Edition''' (often referred to as '''UNIX V3''' or '''V3 UNIX''' - 'Unix' was still normally given in all capital letters at this point in time) was a significant early version of [[UNIX]]. It was the version in which [[pipe]]s appeared, and the last version in which the [[kernel]] was written in [[assembly language]].
+'''UNIX Third Edition''' (often referred to as '''UNIX V3''' or '''V3 UNIX''' - 'Unix' was still normally given in all capital letters at this point in time) was a significant early version of [[UNIX]]. It was the version in which [[pipe]]s appeared, and the last version in which the [[kernel]] was written in [[assembly language]]. The [[source code]] for the [[kernel]] has been completely lost, so it is not possible to make authoritative, detailed, statements about it; but documentation, and source for some commands still exists, which allows technological archaeologists to draw some conclusions about it.
 V3 seems to have run on the [[PDP-11/45]] model of the PDP-11:  "it depends on what hardware is present ([[KE11-A Extended Arithmetic Element|EAE]], [[FP11-B Floating-Point Processor|floating-point option]])". ([http://squoze.net/UNIX/v3man/man5/core core(V)]) The "floating-point option" would only have been on the -11/45.
@@ Line 16: / Line 16: @@
 (And we thus see that V3 still ran on [[PDP-11/20]] model of the PDP-11; the -11/45 would not have had an EAE, since all the EAE operations - except [[normalization]], but that's only needed for [[floating-point]] - were in the basic -11/45. Whether the -11/20 was still supported without the [[KS11 Memory Protection and Relocation option|KS11]] is unknown; as late as V3, there were apparently still UNIX machines without [[memory management]] hardware: "The purpose of this command is to simplify the preparation of object programs for systems which have no relocation hardware." ([http://squoze.net/UNIX/v3man/man1/reloc reloc (I)])
-Probably the protection and relocation provided to UNIX processes on the 11/45 under V3 were very similar to that provided with the KS11, although the memory management mechanisms were more limited than those that came in with [[UNIX Fourth Edition]]: "In the future the text segment will be write-protected and shared." ([http://squoze.net/UNIX/v3man/man5/a.out a.out (V)])
+Probably the protection and relocation provided to UNIX processes on the -11/45 under V3 were very similar to that provided with the KS11, although the memory management mechanisms were more limited than those that came in with [[UNIX Fourth Edition]]: "In the future the text segment will be write-protected and shared." ([http://squoze.net/UNIX/v3man/man5/a.out a.out (V)])
-However, it was keeping multiple processes in main memory at the same time: "only processes whose core images are on disk have visible names". ([http://squoze.net/UNIX/v3man/man8/ps ps (III)])
+However, it was keeping multiple processes in main memory at the same time: "only processes whose core images are on disk have visible names". ([http://squoze.net/UNIX/v3man/man8/ps ps (VIII)])
 The [[file system]] apparently identical to the one in [[UNIX Second  Edition]]; i.e. almost identical to the [[UNIX file system|V6 one]]: the only major differences from the latter being that i) the free blocks are stored as a bit [[array]], rather than a linked [[list]], and ii) [[peripheral|device]] 'special files' are indicated by [[inode]] numbers below 41. (not via a flag in the 'mode' word in the inode, as later).
@@ Line 24: / Line 24: @@
 ==Source==
-A complete copy of Third Edition does not seem to be extant. [[The Unix Heritage Society|TUHS]] has a copy of the 'UNIX Programmer's Manual Third Edition', and the [[source code]] for an early version of the first [[C programming language|C]] [[compiler]] (C was just being defined at the point in time, although it first appeared in [[UNIX Second Edition]]).
+As mentioned, a complete copy of Third Edition does not seem to be extant. [[The Unix Heritage Society|TUHS]] has a copy of the 'UNIX Programmer's Manual Third Edition', and the [[source code]] for an early version of the first [[C programming language|C]] [[compiler]] (C was just being defined at the point in time, although it first appeared in [[UNIX Second Edition]]).
 The 'cmd' directory at TUHS allegedly for [[UNIX Second Edition|V2]] (below) actually seems to be for V3.

@@ Line 32: / Line 32: @@
 * [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3 V3] - file tree at TUHS
 ** [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V2/cmd cmd] - not really V2, as it claims
 * [https://www.tuhs.org/Archive/Distributions/Research/1972_stuff 1972 stuff] - the source for the above
 ** [https://www.tuhs.org/Archive/Distributions/Research/1972_stuff/Readme Readme] - a discussion of what's there
-** [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3/man/man0/intro UNIX Programmer's Manual Third Edition - Introduction]
+* [https://wiki.tuhs.org/doku.php?id=systems:3rd_edition Third Edition Unix]
 * [http://squoze.net/UNIX/v3man/ UNIX Programmer's manual: Third Edition]

@@ Line 12: / Line 12: @@
 '''UNIX Third Edition''' (often referred to as '''UNIX V3''' or '''V3 UNIX''' - 'Unix' was still normally given in all capital letters at this point in time) was a significant early version of [[UNIX]]. It was the version in which [[pipe]]s appeared, and the last version in which the [[kernel]] was written in [[assembly language]].
-It still ran on the [[PDP-11/20]] model of the PDP-11, as well as the [[PDP-11/45]] (apparently). The [[file system]] apparently identical to the one in [[UNIX Second  Edition]]; i.e. almost identical to the [[UNIX file system|V6 one]]: the only major differences being that i) the free blocks are stored as a bit [[array]], rather than a [[list]], and ii) [[peripheral|device]] 'special files' are indicated by [[inode]] numbers below 41. (not via a flag in the 'mode' word in the inode, as later).
+It ran on the the [[PDP-11/45]], but the [[PDP-11/20]] model of the PDP-11 was apparently still supported (whether without the [[KS11 Memory Protection and Relocation option|KS11]] is unknown). The [[memory management]] mechanisms were more limited than those that came in with [[UNIX Fourth Edition]]. ("In the future the text segment will be write-protected and shared." ([http://squoze.net/UNIX/v3man/man5/a.out a.out (V)])).
-A complete copy of Third Edition does not seem to be extant. [[The Unix Heritage Society|TUHS]] has a copy of the 'UNIX Programmer's Manual Third Edition', and the [[source code]] for an early version of the first [[C programming language|C]] [[compiler]] (C was just being defined at the point in time, although it first appeared in [[UNIX Second Edition]]).
+The [[file system]] apparently identical to the one in [[UNIX Second  Edition]]; i.e. almost identical to the [[UNIX file system|V6 one]]: the only major differences from the latter being that i) the free blocks are stored as a bit [[array]], rather than a linked [[list]], and ii) [[peripheral|device]] 'special files' are indicated by [[inode]] numbers below 41. (not via a flag in the 'mode' word in the inode, as later).
 ==External links==

@@ Line 5: / Line 5: @@
 | previous version = [[UNIX Second Edition|V2]]
 | current version = V3
-| next version = [[UNIX Fourth Edition]]
+| next version = [[UNIX Fourth Edition|V4]]
 | type = [[Multi-tasking]], [[multi-user]]
 | architecture = [[PDP-11 architecture|PDP-11]]

@@ Line 3: / Line 3: @@
 | creator = AT&T/[[Western Electric]]
 | year introduced = February, 1973
 | type = [[Multi-tasking]], [[multi-user]]
 | architecture = [[PDP-11 architecture|PDP-11]]

@@ Line 9: / Line 9: @@
 '''UNIX Third Edition''' (often referred to as '''UNIX V3''' or '''V3 UNIX''' - 'Unix' was still normally given in all capital letters at this point in time) was a significant early version of [[UNIX]]. It was the version in which [[pipe]]s appeared, and the last version in which the [[kernel]] was written in [[assembly language]].
-It still ran on the [[PDP-11/20]] model of the PDP-11, as well as the [[PDP-11/45]] (apparently). The [[file system]] is almost identical to the [[UNIX file system|V6 one]]; the only major differences are that i) the free blocks are stored as a bit [[array]], rather than a [[list]], and ii) [[peripheral|device]] 'special files' are indicated by [[inode]] numbers below 41. (not via a flag in the 'mode' word in the inode, as later).
+It still ran on the [[PDP-11/20]] model of the PDP-11, as well as the [[PDP-11/45]] (apparently). The [[file system]] apparently identical to the one in [[UNIX Second  Edition]]; i.e. almost identical to the [[UNIX file system|V6 one]]: the only major differences being that i) the free blocks are stored as a bit [[array]], rather than a [[list]], and ii) [[peripheral|device]] 'special files' are indicated by [[inode]] numbers below 41. (not via a flag in the 'mode' word in the inode, as later).
 A complete copy of Third Edition does not seem to be extant. [[The Unix Heritage Society|TUHS]] has a copy of the 'UNIX Programmer's Manual Third Edition', and the [[source code]] for an early version of the first [[C programming language|C]] [[compiler]] (C was just being defined at the point in time, although it first appeared in [[UNIX Second Edition]]).
@@ Line 17: / Line 17: @@
 * [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3 V3]
 ** [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3/man/man0/intro UNIX Programmer's Manual Third Edition - Introduction]
-*** [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3/man/man5/fs.5 File system]
+** [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3/man/man5/fs.5 File system]
-*** [https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3/man/manx/obproc.7 Boot procedures] - possibly obsolete?
+* [http://squoze.net/UNIX/v3man/ UNIX Programmer's manual: Third Edition]
 {{Nav Unix}}