12-minute Mandelbrot: fractals on a 50 year old IBM 1401 mainframe

Ken Shirriff writes: When I found out that the Computer History Museum has a working IBM 1401 computer[1], I wondered if it could generate the Mandelbrot fractal. I wrote a fractal program in assembly language and the computer chugged away for 12 minutes to create the Mandelbrot image on its line printer. In the process […]