So i found this computer that must be from 1999/2000 laying on the streets, full setup, only thing needed was some cleaning as every component seems to be good and working.
It is a Pentium III slot 1 333MHz, 256 mb RAM dimm, 8.4GB disk, 3 1/4" floppy, i tried searching the exact mother on internet but i found only similar (it's an Xcel 2000).
I've been searching for x86 distros but all seem to exceed the system specs.
Also i don't know how will i connect it to the Internet since it uses a phone line cable and i'm not sure if that's even possible anymore.
Edit: seems like the viable options are Gentoo or Debian, with Debian being heavily discussed and even discouraged.