Titokone is a simulator for the TTK-91 machine, developed at the University of Helsinki, Department of Computer Science as a part of a software development project course in 2004. The software has been published under the LGPL license, and you can get it at http://www.cs.helsinki.fi/group/koski/ or via the "Computer Organization" course homepage.
This version is slightly modified version of Titokone 1.1. Changes were made by Jari Suominen.