... wasn't actually a Mac, but an emulator on the Atari ST. However, only for a very short time, it just wasn't fast enough. My first real Mac was a PowerBook 5300c, which I bought after my PC notebook had been causing quite a bit of trouble back then. The PC notebook has since been sold as scrap, but the PowerBook still works flawlessly. With MachTen I already had a Mach Kernel back then, even though it only ran as an application under OS Classic.
At Industrial Technology & Witchcraft you can find the original article.