| 1985 | - | 1989 | Languages: Basic, Assembler (6502), K&R C |
| Applications: Copy programs, data management, | |||
| games and tests, multitasking (C64) | |||
| Platform: C64, Amiga | |||
| 1989 | - | 1992 | Languages: ANSI-C, ANSI-C++, Pascal |
| Applications: Interpreter, Graphic, div. | |||
| algorithms (mandelbrot, wallpapers and dragon (fractals)) | |||
| Platform: Commodore Amiga, MS-Dos | |||