Not the first I owned, but the first I used.
Back in 1990 I was 9 years old and my mom enrolled me in a computer class. By this time, the closest I had been to using a computer was playing my Atari 2600 and my NES. I don’t remember what brand the computers at the lab where I took this class were, but I do remember my teacher (a young man, probably around 20) said they didn’t have a hard drive, so in order to boot them up we had to load up MS-DOS with a 5 1/4 inch floppy. The monitors had green monochrome displays and sat on top of the actual PC which was placed horizontally, no mouse, just the keyboard and all this hardware was beige. I learned how to use all kinds of text commands to create/rename/delete directories and text files. The most fun thing I learned was how to use a program called Banner Mania to design and print banners on the dot matrix printers.
This might be my next phone. I’m still rocking the Pixel 5a which has updates until August and thanks to its OtterBox it’s still in great condition. But IDK, might end up installing a custom ROM.