And I was sub-contracted to do that. It was about a six month long project. I wrote an entire windowing system on top of DOS to use VGA to show the display.
(I'm a good fucking programmer, and that's not the only time I've written a graphical UI from scratch.)
And. A comical note: about six weeks before the project was due, my hard drive died. And. My backup drive died.
All I had were some two-month old printouts.