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Incompatible Timesharing System

[Build Status] (https://travis-ci.org/PDP-10/its)

About ITS

ITS, the Incompatible Timesharing System, is an operating system for the PDP-10 computer family. It was written by hackers at MIT in the 1960s. The MIT site was shut down in 1990, but enthusiasts continue to operate ITS systems to this day.

Documentation

See the doc subdirectory for documentation.

There's a DDT cheat sheet for Unix users.

Building it from scratch

This repository contains source code, tools, and scripts to build ITS from scratch.

  1. First, magnetic tape images are created from files in src and bin. There are two bootable tapes, and two tapes with files in DUMP backup format.

  2. Then the tapes are used to create a file system on an RP06 disk and populate it with a minimal system.

  3. Next, the system is booted from the disk. Source code is loaded from tape, and the following programs are rebuilt:

    • MIDAS, the assembler.
    • DDT, debugger and HACTRN user login shell.
    • The ITS monitor (kernel).
    • Exec DDT, standalone debugger.
    • NSALV, standalone file system tool.
    • DSKDMP, disk bootstrap and file access.
    • KSFEDR, manipulate front-end file system.

  4. The new DSKDMP is installed, and the rebuilt monitor and salvager are combined into a new ITS binary, which is then started.

  5. Remaining programs are rebuilt:

    • TECO, editor.
    • EMACS, binaries only.
    • DUMP, tape backup and restore.
    • PDSET, set time and date.
    • LOCK, shut down system.
    • ATSIGN DEVICE, load device drivers.
    • TCTYP and CRTSTY, terminal handling.
    • PEEK, system monitoring.
    • ARCDEV, transparent file system access to archive files.
    • ATSIGN TARAKA, starts dragons.
    • Dragons: DMPCPY, MODEMS, NETIME, PFTHMG.
    • MTBOOT, make bootable tapes.
    • HOSTS3, the host table compiler.
    • H3MAKE, a job that requests DRAGON to build host table.
    • ATSIGN TCP, TCP support
    • TELSER, Telnet/Supdup server
    • TELNET, Telnet client
    • SUPDUP, Supdup client
    • FTPS, FTP Server
    • FTPU, FTP Client

  6. A brand new host table is built from the host table source and installed into SYSBIN; HOSTS3 > using H3MAKE.

  7. Finally, the whole file system is dumped to tape.

Network Support

Currently, networking is only supported under the KLH10 emulator. SIMH does not have the necessary support. As of this release, only the ITS monitor, host table tools, and binary host table are installed.

Currently, basic TCP network support is in the build, in addition to both a TELNET/SUPDUP server, and both TELNET and SUPDUP clients. Additionally, both an FTP server and client are included. Other network services will appear in a subsequent release.

The KLH10 dskdmp.ini file has an IP address (192.168.1.100) and gateway IP address (192.168.0.45) configured for the ITS system. The IP address matches the address configured in SYSTEM; CONFIG > (as IMPUS3). Finally, the HOST table source (SYSHST; H3TEXT >) and binary (SYSBIN; HOSTS3 >) defined a host called DB-ITS.EXAMPLE.COM at the IP address 192.168.1.100.

In order to change the IP address of the host, you must update multiple places and rebuild ITS and the host table. You will also have to modify dskdmp.ini. Here are the places where the IP address is configured (and all of these must agree):

dskdmp.ini (in build/klh10 directory on the host)
SYSTEM; CONFIG > (ITS configuration file)
SYSHST; H3TEXT > (host table source file)
SYSBIN; HOSTS3 > (binary file compiled from SYSHST; H3TEXT >)