I've assembled some notes from old manuals and other sources
on the formats used for on-disk file systems through the
Additional notes, comments on style, and whatnot are welcome.
(It may be sensible to send anything in the last two categories
directly to me, rather than to the whole list.)
Hi guys, new SIMH (and Research Unix) user here coming from the future
(Linux), haha. Well, as the mail subject says, I have a problem.
After creating a bootable disk from a virgin Unix v7 distribution tape by
following this guide, http://homepages.thm.de/~hg53/pdp11-unix/, and after
umounting the usr file system and halting the machine, SIMH returns:
HALT instruction, PC: 000002 (HALT)
after running the command:
and I cannot boot my 87,9 MB 'system.hp' disk.
I thought the problem was on the final line of 'run.conf':
But when I use SIMH without .conf files and by manually typing the
set cpu 11/45
set cpu 256k
set rp0 rp04
attach rp0 system.hp
I see the same HALT message too.
I'm currently unning SIMH from Debian/Ubuntu package 3.8.1-5build1. Should
I update to a newest one? Or did I make a mistake when creating my bootable
Don't remember if this was already posted to this list, so, just in case
The UNIX System: Making Computers More Productive
In the late 1960s, Bell Laboratories computer scientists Dennis Ritchie
and Ken Thompson started work on a project that was inspired by an
operating system called Multics, a joint project of MIT, GE, and Bell
Labs. The host and narrator of this film, Victor Vyssotsky, also had
worked on the Multics project. Ritchie and Thompson, recognizing some of
the problems with the Multics OS, set out to create a more useful,
flexible, and portable system for programmers to work with.
What's fascinating about the growth of UNIX is the long amount of time
that it was given to develop, almost organically, and based on the needs
of the users and programmers. The first installation of the program was
done as late as 1972 (on a NY Telephone branch computer). It was in
conjunction with the refinement of the C programming language,
principally designed by Dennis Ritchie.
Because the Bell System had limitations placed by the government that
prevented them from selling software, UNIX was made available under
license to universities and the government. This helped further its
development, as well as making it a more "open" system.
This film "The UNIX System: Making Computers More Productive", is one of
two that Bell Labs made in 1982 about UNIX's significance, impact and
usability. Even 10 years after its first installation, it's still an
introduction to the system. The other film, "The UNIX System: Making
Computers Easier to Use", is roughly the same, only a little shorter.
The former film was geared towards software developers and computer
science students, the latter towards programmers specifically.
The film contains interviews with primary developers Ritchie, Thompson,
Brian Kernighan, and many others.
While widespread use of UNIX has waned, most modern operating systems
have at least a conceptual foundation in UNIX.
Release date: 02/22/2012