I've been writing on computers since 1983.
I started on a Kaypro MS-DOS machine with a 9-inch green screen from 1983-1988.
When my first three books sold in 1989, I got an IBM Clone.
Through the years I've worked on various Hewlett-Packard desktops until I switched to laptops in 2008. I've had several since then, all HP of course.