The first one I owned was an IBM model that didn't catch on very well. Maybe an IBM PS/2, around 1989. The first personal computer I ever used, though, was an early Apple, at the public library, around 1981 or '82.
PCs were a revelation to me. I had been writing industrial process control programs for DEC PDP-8s for several years, and then accounting programs for various mainframes for a year after that. By the time I bought a PC for home use, I had moved on to writing library catalog and circulation programs that ran on a DEC mini.
Now I have a NexLink CPU running Windows 7 under my desk and an Acer flat-screen monitor in front of me. For input, I use a Fellowes natural keyboard and a Microsoft mouse. Very different from that early Apple with the monitor, CPU and keyboard all in one inflexible unit.
Marianna