Slackware, installed with floppies on a 486.I tried debian red hat suse coral linux but always came back to Slackware.There was a bunch more, that I cant remember the names of, one I do remember was Stampede linux, Daniel Robbins put it out, he then dumped it and made Gentoo, I used Gentoo for a year or so, on an original AMD Athlon, it was night and day different from un optimised Slackware. I saw an announcement for a new distro on the gentoo forums for Arch, 686 optimisations, no need to compile!. I installed that and used it for about 9 years. I got sick of all the breakages, the systemd adoption drama, briefly went back to Gentoo( or Funtoo, actually), then discovered Void. I have been using Void since 2010, I also use Openbsd, reminds me of the 'old days' of linux before the tech bros and corporations.