I just completed all 25 days of my first #AdventOfCode. I used JavaScript, Commodore 64 Basic, Excel, and solved day 23 by hand. Thank you, Eric Wastl, for the great contest and puzzles. That was hard and a lot of fun. Looking forward to AoC 2022. A Happy New Year to all!

I gave a little talk (in German) on IBM mainframes at the cool RETROpulsiv meeting. The video is now available here: youtube.com/watch?v=piFSxR…

I also tried the day 4 puzzle of #AdventOfCode 2022 and wrote a solution on the Commodore 64 in BASIC. My program ran only about 9 minutes to solve both parts of the puzzle. Here is the source code: github.com/norbertkehrer/…

I solved now days 1 to 5 of Advent of Code 2022 in BASIC on the Commodore 64. Let's see how far I can get. Here is the source code for my 5 solutions: github.com/norbertkehrer/…

I completed also day 6 of #AdventOfCode 2022 using BASIC on the Commodore 64. The program ran "only" 7 minutes for both parts of the puzzle. Here is the source code for days 1 to 6 on the C64: github.com/norbertkehrer/…

I just completed day 10 of #AdventOfCode 2022 using BASIC on the Commodore 64. This time a "graphics" output had to be created by driving the beam of a cathode ray tube! Just like graphics programming back in the eighties :-) Here is the source code: github.com/norbertkehrer/…

My code was quite GOTO-rich back in 1981. Development cycle: Handwriting it on last year's used calendar sheets and testing it on the computers on display in the department store 60 kilometers away from home.

I do like a good index.

Kleiner Rundgang für alle die die Sneak Preview des Computeum auf dem Donaugassenfest verpasst haben:

Keeping up with technology…

Preparing my setup for the Vintage Computer Festival Europe on this weekend in Munich: An Austrian "Mupid" videotex decoder from the 1980s with a little self-written server program, e.g. to browse German Teletext pages or to load and run Z80 machine code on the decoder. #vcfe

I wrote an emulator of Atari's 1981 arcade game Centipede running on the Commodore 64. The C64 executes the original game program. The arcade video and sound hardware is simulated. More info and program download at: norbertkehrer.github.io/centipede_c64.… youtu.be/ocAY6csEbMQ?fe… via YouTube

I wrote an emulator of Atari's 1981 arcade game Centipede running on the Atari 800XL. The original game program is directly executed on the home computer. The video hardware is simulated in software. Get the program here: norbertkehrer.github.io/centipede_a800… youtu.be/81O9tI8lMpc?fe…