i) In 1990 I was using a VAX computer in high school shared by a whole class and programming in Pascal. The compilation process (executed in a compilation queue) could take a few minutes or half an hour depending of how many people and processes were running that day.

I wanted to imitate this stuff in my Amiga 500, so I joined a friend who knew about electronics and he removed a Commodore 64 keyboard and made the interface to connect to the Amiga as a second keyboard. I made the software in assembler to use the same computer with a single monitor in two windows using two keyboards. A bizarre but funny project.

ii) In 1992 I wanted to make my own graphical operating system. Not in the real sense but in the Windows 3.0 sense. I started doing this in Turbo Pascal and at some point I stopped because my multitasking was cooperative just realizing a few years later that Windows (and Apple!) used this basic strategy too. I felt ashamed of them.