Intended to be a basic example of an assembler for two simple architectures, written with the aid of lex and yacc (or GNU flex/bison). Being small, it should lend itself to learning, extension and modification. The source code is released under the GPL and has been built and tested on NetBSD, Linux and OS X.

V7/x86 is a port of the Seventh Edition of the UNIX operating system to the x86 (IA-32) based PC. UNIX V7 was the last general distribution (around 1979) to come from the Research group at Bell Labs, the original home of UNIX. The port was done mostly around 1999 when "Ancient UNIX" source code licenses first became available, and was revised for release, with some enhancements, during 2006-7.
The distribution includes the full UNIX Version 7 operating system, with source code, pre-built binaries, man pages, and original Version 7 documentation. Also included are a custom UNIX-style x86 assembler, an ACK-based C compiler, and several key early UCB software components such as the C shell, the editors ex and vi, and the pager more.
V7/x86 currently supports ATA (IDE) hard drives, ATAPI CDROM drives, a 1.44M floppy drive, and standard serial ports, in addition to the usual PC screen and keyboard. For easier installation and setup, supplied utilities allow access to CD (ISO 9660) and FAT (MS-DOS) filesystems. Source code is available under a Berkeley-style license.

This is the Computer History Wiki, a knowledge base about historic computers which anyone can edit. Currently, we've got 713 articles!

This directory contains the files needed to build a clean unix v6
installation from tape.  It requires that you have "expect" and
simh's "pdp11" and "wget" installed in your path.

Uses a touch screen.

Unix History Repository

The goal of this project is to create a git repository representing the Unix source code history, starting from the 1970s and ending in the modern time. To fulfill this goal the project brings data from early snapshots, repositories, and primary research. The project aims to put in the repository as much metadata as possible, allowing the automated analysis of Unix history.

Created by Diomidis Spinellis.

Information about the TECO editor.
Found via http://home.windstream.net/engdahl/teco.htm
See also https://almy.us/teco.html, https://github.com/blakemcbride/TECOC and the home page of Dan Murphy, the author of the original TECO at http://www.opost.com/dlm/

6502.org is a resource for people interested in building hardware or writing software for the 6502 microprocessor and its relatives.

We continually strive to remain the largest and most complete source for 6502-related information in the world. This includes everything from articles and project descriptions to schematics and source code.

Series of blog articles by Will Senn about running v6 unix on SimH.
On 2022-12-08 he migrated the blog to https://decuser.github.io/

Another emulator for the pdp11/70 written in Javascript. While it ist far from perfect according to the author, it has a nice front panel.