Github Repository

The ORION educational system

Includes five educational units (computer architecture, operating system principles, information representation, introduction to computer programming, the operating system DOS). The package is mainly intended to high-school pupils, who attend the introductory informatics courses. It has already been distributed to over 1000 schools and individual users, as an end product of NTUA-ICCS.

The Empix Operating System

MicroEmpix is the microkernel (much nearer to an exokernel) version of Empix, an operating system (OS) developed at the Computing Systems Laboratory (CSLab) of the Electrical & Computer Engineering department at the National Technical University of Athens.

Empix began in the late 1980’s as the laboratory’s effort to write a small Unix-like modern multitasking OS, intended for educational use. Borrowing most of its basic characteristics (file system, binary format, shell) from other popular OSes of the time (Xinu, Minix, DOS). Empix is quite small (about 10,000 lines of code) and supports Intel x86 processors, in the IBM Personal Computers (PC) XT (8088), and AT (80286) architectures, floppy disks and hard disk drives (with the File Allocation Table (FAT) 16 limits), and Enhanced Graphics Adapter (EGA) graphics (80x25 color terminal) and the serial ports. It has a shell with some basic commands, and the ability to execute multiple processes.

MicroEmpix is far different. It’s about 1,600 lines of code (over which about 1,000 devoted to serial port control), and it’s a microkernel, meaning that it creates and runs processes in kernel-space, with no distinction between process-space and kernel space. What the kernel sees, the process sees and vice versa. No system calls occur to require a system call dispatcher or a similar mechanism. Kernel functions are inherent to the processes created, and there is but one user.

Telemedicine system for ECGs

This system covers the acquisition, storage, display and teletransmission of electrocardiograms (ECG). Moreover, it includes a module allowing teleconferencing and telemonitoring, for remote sources of ECGs.

The parallel programming platform ORCHID

This platform offers significant advantages (like distributed shared memory, global semaphores, virtual topologies etc.), to facilitate the easy and secure development of programs for parallel machines, with emphasis in distributed memory architectures.


The DEFACTO project seeks to create a computational framework for the design of interactive story systems (ISS). ISS are a new, computer-based art form, providing experiences that are both meaningfully interactive and good stories. The result of DEFACTO will be the development of a design framework for creating a new, widely accessible generation of ISS, that strike a balance between interactivity and coherence.