1980

In 1980, I worked the first time with a computer: a Commodore PET 2001 with a 6502 CPU, 8 KB RAM, 14 KB ROM, a 9 inch b/w display (25 lines, 40 columns), built-in "chicklet" keyboard and cassette drive. The operating system, a BASIC interpreter, was in ROM, so you turned power on and the PET was ready...

One of my first programs was the implementation of the prime number "Sieve of Erathostenes". The original listing above was printed on a Epson MX-80 printer.

Later I wrote in BASIC a line oriented word processing software (I didn't know the name for it at that time!). I "invented" to format text bold or italic, to number lines, to search and replace - all without having seen a similar software. This was the first time I encountered bugs in a OS, because sometimes the garbage collection of strings did result in strange effects.