I forgot all about BASIC - the Atari version thereof! I used to buy Compute! magazine and type in the Atari version of the games they published.
Not me. It all started for me when my soon-to-be mother in law (now ex MIL) gave me a busted HP 386SX, and my tinker instinct took over. That machine is why I (book) learned DOS, found how to boot from a disk, found out how/what to edit... and no sh*t, found a pie recipe in config.sys, and fixed it.
And that's all I do to this day... And everything I have written/published is toward that end... Hacking the system... Got cocky hacking over the net, got caught, and nearly did time. So I went back to Hands-On... which is usually kinda legal, sorta.