This site describes how to set up and run an Incompatible Timesharing System (ITS). And a little about how to use it, too!

This is work in progress. Your contributions are welcome!!

Main entry points to this site:

• setting up your own ITS
• my introductory guide to ITS

Code:

• ITS sources for building ITS from scratch.
• Patches for the Public ITS distribution (in particular Y2K fixes).
• The Public ITS distribution.

More info:

• ITS tutorials at SDF.ORG
• Getting Started Computing at the AI Lab especially chapter 6, gives a gentle introduction to ITS commands.
• The An Introduction to ITS for the MACSYMA User by V. Ellen Golden, Mathlab Memo #3, revised April 14, 1981.
• The DDT Primer and Reference Manual, for a serious introduction to DDT/HACTRN, (also interactively in ITS by using the command :INFO DDT.)
• The ITS Status Report, MIT AI Memo 238, by Donald E. Eastlake, for some insights in the philosophy, structure, and features of ITS.
• The HACTRN by Guy L. Steele, for a fun introduction to ITS commands.
• A Guide to ITS Operations - Useful Spells And Incantations by Christopher C. Stacy.
• The Wikipedia article on the Incompatible Timesharing System, for historical information.
• .INFO.;DDTORD >, documentation for the “command interpreter” of ITS.
• HAKMEM, especially the “Programming Hacks” section.

I grew tired of the spambots registering, so if you want to register, please do it manually by contacting Björn Victor. Sorry about the inconvenience.

There is also a mailing list for ITS hackers.

This site now supports TLS (through https://its.victor.se/wiki)