Unix Seventh Edition
Example V7 session
|Architecture:||PDP-11, Interdata 8/32|
|Next Version:||V8 (not released outside Bell)|
|Date Released:||January, 1979|
This was the last research version of UNIX (although from V7 on, it was spelled 'Unix') to leave Bell Labs. It was also quite a portable version; the Labs had started to move it to other machines, starting with the Interdata 8/32.
The main change in the kernel from V6 (from the user's point of view) was that the UNIX file system had been modified to use 32-bit disk block numbers, to support the larger disks which were starting to appear. Other kernel changes included:
- the addition of the process' 'environment', and the addition of the exece() system call to pass it
- replacement of the savu()/retu() process-switching mechanism with the new save()/resume() mechanism
- changes to the scheduler mechanism
- improved locking on use of 'pure texts' (shared copies of read-only executable binaries) (it is not clear if this was inherited from PWB/UNIX 1, or if it was done by the research group, after V6, but before PWB/UNIX split off)
- process arguments being passed in swap space, instead of disk buffers (also shared with PWB1)
- the ioctl() system call for per-device special functions
Extensive new capabilities/tools elsewhere in the operating system included:
- a greatly improved shell, with "string variables, trap handling, structured programming, user profiles, settable search path, multilevel file name generation, etc"
- an extended version of the C programming language (much of which had already appeared outside the Labs as the so-called 'Typesetter C')
- the standard I/O library
- the UUCP data communication protocol suite
- text preparation tools ('troff', 'tbl', etc)
Unix V7 was also one of the first operating systems to ship with a Fortran 77 compiler.
These are the known platforms to run Unix V7
The PDP-11 was the primary platform which Unix V7 was written on. All other V7's can trace themselves back to this version.
The Interdata 8/32 was the first port to a 32 bit platform outside of Bell Labs.
The IBM PC port was done by Microsoft however they resold it to various other OEM's under the name Xenix. Eventually SCO bought the rights & the Microsoft division responsable for Xenix, along with a deal giving Microsoft a portion of all SCO sales.
A separate project aims to port V7 to the 80386 native; information can be found here.
Unix v7 does include some games..
arithmetic backgammon banner bcd bj checkers chess ching cubic fortune hangman lib maze moo ppt quiz reversi ttt words wump
How do I get this to run?!
Also be sure to check out the Setting Up Unix - Seventh Edition document that was included in the tape.
- V7 - distro at TUHS
- V7M - distro of the DEC V7M version at Bitsavers
- Unix Seventh Edition Manual, Volume 2 - everything except the 'man' pages
- Odd Comments and Strange Doings in Unix - includes an explanation of the need to replace savu()/retu() with the new save()/resume()
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