Difference between revisions of "UNIX Fourth Edition"

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(Some more info on the nsys kernel.)
m (+previous version)
 
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| creator = AT&T/[[Western Electric]]
 
| creator = AT&T/[[Western Electric]]
 
| year introduced = November, 1973
 
| year introduced = November, 1973
| next version = [[UNIX Fifth Edition]]
+
| previous version = [[UNIX Third Edition|V3]]
 +
| current version = V4
 +
| next version = [[UNIX Fifth Edition|V5]]
 
| type = [[Multi-tasking]], [[multi-user]]
 
| type = [[Multi-tasking]], [[multi-user]]
 
| architecture = [[PDP-11 architecture|PDP-11]]
 
| architecture = [[PDP-11 architecture|PDP-11]]
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Apparently, the only model of PDP-11 supported was the [[PDP-11/45]].
 
Apparently, the only model of PDP-11 supported was the [[PDP-11/45]].
  
A complete copy of Fourth Edition does not seem to be extant. [[The Unix Heritage Society|TUHS]] has a copy of the 'UNIX Programmer's Manual'
+
A complete copy of Fourth Edition does not seem to be extant. [[The Unix Heritage Society|TUHS]] has a copy of the 'UNIX Programmer's Manual' and the [[source]] for what would become the V4 kernel. The main differences in this 'nsys' kernel compared to the later V4 kernel are the earlier V3 way of registering signal handlers, and a few not yet implemented system calls. Most importantly [[pipe]]s had not yet been implemented, making this kernel not fully functional even on a V3 system.
and the [[source]] for what would become the V4 kernel.
 
The main differences in this nsys kernel compared to the later V4 kernel are the earlier V3 way of registering signal handlers
 
and a few not yet implemented system calls. Most importantly pipes had not yet been implemented, making this kernel not fully functional even on a V3 system.
 
  
 
==External links==
 
==External links==

Latest revision as of 06:05, 23 June 2022


Unix V4
Type: Multi-tasking, multi-user
Creator: AT&T/Western Electric
Architecture: PDP-11
Previous Version: V3
Current Version: V4
Next Version: V5
Date Released: November, 1973


UNIX Fourth Edition (often referred to as UNIX V4 or V4 UNIX - 'Unix' was still normally given in all capital letters at this point in time) was an important early version of UNIX. It was the first version in which the kernel was written in C. It also had minor changes to the UNIX file system‎ (such as the ability of any inode to hold a device 'special file'), which left it in the form it retained until the BSD Fast File System.

Apparently, the only model of PDP-11 supported was the PDP-11/45.

A complete copy of Fourth Edition does not seem to be extant. TUHS has a copy of the 'UNIX Programmer's Manual' and the source for what would become the V4 kernel. The main differences in this 'nsys' kernel compared to the later V4 kernel are the earlier V3 way of registering signal handlers, and a few not yet implemented system calls. Most importantly pipes had not yet been implemented, making this kernel not fully functional even on a V3 system.

External links