I was studying Math and had to take a few classes on programming, FORTRAN IV and Algol. Without knowing what was going on I aced my classes. My friends noticed and started asking me to help with their assignments. I spent the next few years making money tutoring CS and helping them write their assignments. In the mean time someone who learned about this offered me a job as and RPG II programmer (if there is such a thing); one night, driving back from going to work at 2 AM to fix a disk allocation problems on a JCL deck, I dreamed up of writing a program to deal with disk allocation. It was then that I discovered operating systems. Shortly thereafter I came to the US to study OS and worked with operating systems from '78 to the mid eighties; those were the best years of my programming career. Recently I found a link to a course on how to write and OS from scratch. I'll do it. Back to the start I go! Rodrigo Silveira